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Gnutls: gnutls: certificate validation bypass due to oversized subject alternative name

Type: advisorySource: Official CVE List1 source record

A flaw was found in gnutls. When validating certificates, an oversized Subject Alternative Name (SAN) could cause the validation process to incorrectly fall back to checking the Common Name (CN) field. This could allow a remote attacker to bypass proper certificate validation, potentially leading to spoofing or man-in-the-middle attacks.

Announced Group revision 1
Original source ↗

CVE-2026-42013

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-42013

Red Hat Enterprise Linux 10

Source reference: /containers/cna/affected/1/product

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Red Hat Enterprise Linux 10.0 Extended Update Support

Source reference: /containers/cna/affected/2/product

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Red Hat Enterprise Linux 7 Extended Lifecycle Support

Source reference: /containers/cna/affected/3/product

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Red Hat Enterprise Linux 8

Source reference: /containers/cna/affected/4/product

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Red Hat Enterprise Linux 8

Source reference: /containers/cna/affected/5/product

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Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

Source reference: /containers/cna/affected/6/product

Affected versions
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Prerequisites
Not stated in this record

Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

Source reference: /containers/cna/affected/7/product

Affected versions
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Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Source reference: /containers/cna/affected/8/product

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Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Source reference: /containers/cna/affected/9/product

Affected versions
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Not stated in this record
Prerequisites
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Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

Source reference: /containers/cna/affected/10/product

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Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

Source reference: /containers/cna/affected/11/product

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Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Source reference: /containers/cna/affected/12/product

Affected versions
Not stated in this record
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Prerequisites
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Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Source reference: /containers/cna/affected/13/product

Affected versions
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Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Source reference: /containers/cna/affected/14/product

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Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Source reference: /containers/cna/affected/15/product

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Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

Source reference: /containers/cna/affected/16/product

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Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

Source reference: /containers/cna/affected/17/product

Affected versions
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Prerequisites
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Red Hat Enterprise Linux 9

Source reference: /containers/cna/affected/18/product

Affected versions
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Red Hat Enterprise Linux 9

Source reference: /containers/cna/affected/19/product

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Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Source reference: /containers/cna/affected/20/product

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Not stated in this record
Prerequisites
Not stated in this record

Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Source reference: /containers/cna/affected/21/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Red Hat Enterprise Linux 9.6 Extended Update Support

Source reference: /containers/cna/affected/22/product

Affected versions
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Not stated in this record
Prerequisites
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Red Hat OpenShift Container Platform 4.12

Source reference: /containers/cna/affected/23/product

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Red Hat OpenShift Container Platform 4.16

Source reference: /containers/cna/affected/24/product

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Red Hat OpenShift Container Platform 4.17

Source reference: /containers/cna/affected/25/product

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Red Hat OpenShift Container Platform 4.18

Source reference: /containers/cna/affected/26/product

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Red Hat OpenShift Container Platform 4.19

Source reference: /containers/cna/affected/27/product

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Cert Manager support for Red Hat OpenShift release 1.17

Source reference: /containers/cna/affected/28/product

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Cert Manager support for Red Hat OpenShift release 1.17

Source reference: /containers/cna/affected/29/product

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Cert Manager support for Red Hat OpenShift release 1.17

Source reference: /containers/cna/affected/30/product

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Not stated in this record
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Not stated in this record
Prerequisites
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Cert Manager support for Red Hat OpenShift release 1.17

Source reference: /containers/cna/affected/31/product

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Cert Manager support for Red Hat OpenShift release 1.18

Source reference: /containers/cna/affected/32/product

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Cert Manager support for Red Hat OpenShift release 1.18

Source reference: /containers/cna/affected/33/product

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Prerequisites
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Cert Manager support for Red Hat OpenShift release 1.18

Source reference: /containers/cna/affected/34/product

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Not stated in this record
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Prerequisites
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Cert Manager support for Red Hat OpenShift release 1.18

Source reference: /containers/cna/affected/35/product

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Not stated in this record
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Not stated in this record
Prerequisites
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Cert Manager support for Red Hat OpenShift release 1.18

Source reference: /containers/cna/affected/36/product

Affected versions
Not stated in this record
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Not stated in this record
Prerequisites
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Cert Manager support for Red Hat OpenShift release 1.20

Source reference: /containers/cna/affected/37/product

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Not stated in this record
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Red Hat Discovery 2

Source reference: /containers/cna/affected/38/product

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Red Hat Discovery 2

Source reference: /containers/cna/affected/39/product

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Red Hat Hardened Images

Source reference: /containers/cna/affected/40/product

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Red Hat OpenShift AI 3.4

Source reference: /containers/cna/affected/41/product

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Red Hat Update Infrastructure 5

Source reference: /containers/cna/affected/42/product

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Red Hat Update Infrastructure 5

Source reference: /containers/cna/affected/43/product

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Red Hat Update Infrastructure 5

Source reference: /containers/cna/affected/44/product

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Red Hat Update Infrastructure 5

Source reference: /containers/cna/affected/45/product

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Red Hat Update Infrastructure 5

Source reference: /containers/cna/affected/46/product

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Red Hat Update Infrastructure 5

Source reference: /containers/cna/affected/47/product

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Red Hat Update Infrastructure 5

Source reference: /containers/cna/affected/48/product

Affected versions
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Red Hat Enterprise Linux 6

Source reference: /containers/cna/affected/49/product

Affected versions
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Red Hat OpenShift Container Platform 4

Source reference: /containers/cna/affected/50/product

Affected versions
Not stated in this record
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Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "versions": [
      {
        "status": "affected",
        "version": "0"
      }
    ],
    "packageName": "gnutls",
    "collectionURL": "https://gitlab.com/gnutls/gnutls"
  },
  {
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:10.2"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 10",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:3.8.10-4.el10_2",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "gnutls",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/o:redhat:enterprise_linux_eus:10.0"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 10.0 Extended Update Support",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:3.8.9-9.el10_0.19",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "gnutls",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/o:redhat:rhel_els:7"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 7 Extended Lifecycle Support",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:3.3.29-9.el7_9.2",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "gnutls",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:enterprise_linux:8::appstream",
      "cpe:/o:redhat:enterprise_linux:8::baseos"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:3.6.16-8.el8_10.6",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "gnutls",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:enterprise_linux:8::appstream",
      "cpe:/o:redhat:enterprise_linux:8::baseos"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:3.6.16-8.el8_10.6",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "gnutls",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_aus:8.4::appstream",
      "cpe:/a:redhat:rhel_eus_long_life:8.4::appstream",
      "cpe:/o:redhat:rhel_aus:8.4::baseos",
      "cpe:/o:redhat:rhel_eus_long_life:8.4::baseos"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:3.6.14-10.el8_4.1",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "gnutls",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_aus:8.4::appstream",
      "cpe:/a:redhat:rhel_eus_long_life:8.4::appstream",
      "cpe:/o:redhat:rhel_aus:8.4::baseos",
      "cpe:/o:redhat:rhel_eus_long_life:8.4::baseos"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:4.13-3.el8_4.1",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "libtasn1",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_aus:8.4::appstream",
      "cpe:/a:redhat:rhel_eus_long_life:8.4::appstream",
      "cpe:/o:redhat:rhel_aus:8.4::baseos",
      "cpe:/o:redhat:rhel_eus_long_life:8.4::baseos"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:3.6.14-10.el8_4.1",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "gnutls",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_aus:8.4::appstream",
      "cpe:/a:redhat:rhel_eus_long_life:8.4::appstream",
      "cpe:/o:redhat:rhel_aus:8.4::baseos",
      "cpe:/o:redhat:rhel_eus_long_life:8.4::baseos"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:4.13-3.el8_4.1",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "libtasn1",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_aus:8.6::appstream",
      "cpe:/a:redhat:rhel_eus_long_life:8.6::appstream",
      "cpe:/o:redhat:rhel_aus:8.6::baseos",
      "cpe:/o:redhat:rhel_eus_long_life:8.6::baseos"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:3.6.16-5.el8_6.5",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "gnutls",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_aus:8.6::appstream",
      "cpe:/a:redhat:rhel_eus_long_life:8.6::appstream",
      "cpe:/o:redhat:rhel_aus:8.6::baseos",
      "cpe:/o:redhat:rhel_eus_long_life:8.6::baseos"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:4.13-3.el8_6.2",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "libtasn1",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_aus:8.6::appstream",
      "cpe:/a:redhat:rhel_eus_long_life:8.6::appstream",
      "cpe:/o:redhat:rhel_aus:8.6::baseos",
      "cpe:/o:redhat:rhel_eus_long_life:8.6::baseos"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:3.6.16-5.el8_6.5",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "gnutls",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_aus:8.6::appstream",
      "cpe:/a:redhat:rhel_eus_long_life:8.6::appstream",
      "cpe:/o:redhat:rhel_aus:8.6::baseos",
      "cpe:/o:redhat:rhel_eus_long_life:8.6::baseos"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:4.13-3.el8_6.2",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "libtasn1",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_e4s:8.8::appstream",
      "cpe:/a:redhat:rhel_tus:8.8::appstream",
      "cpe:/o:redhat:rhel_e4s:8.8::baseos",
      "cpe:/o:redhat:rhel_tus:8.8::baseos"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8.8 Telecommunications Update Service",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:3.6.16-7.el8_8.4",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "gnutls",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_e4s:8.8::appstream",
      "cpe:/a:redhat:rhel_tus:8.8::appstream",
      "cpe:/o:redhat:rhel_e4s:8.8::baseos",
      "cpe:/o:redhat:rhel_tus:8.8::baseos"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8.8 Telecommunications Update Service",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:4.13-4.el8_8.1",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "libtasn1",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_e4s:8.8::appstream",
      "cpe:/a:redhat:rhel_tus:8.8::appstream",
      "cpe:/o:redhat:rhel_e4s:8.8::baseos",
      "cpe:/o:redhat:rhel_tus:8.8::baseos"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:3.6.16-7.el8_8.4",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "gnutls",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_e4s:8.8::appstream",
      "cpe:/a:redhat:rhel_tus:8.8::appstream",
      "cpe:/o:redhat:rhel_e4s:8.8::baseos",
      "cpe:/o:redhat:rhel_tus:8.8::baseos"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:4.13-4.el8_8.1",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "libtasn1",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:enterprise_linux:9::appstream",
      "cpe:/o:redhat:enterprise_linux:9::baseos"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 9",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:3.8.10-4.el9_8",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "gnutls",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:enterprise_linux:9::appstream",
      "cpe:/o:redhat:enterprise_linux:9::baseos"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 9",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:3.8.10-4.el9_8",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "gnutls",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
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Related CVEs
CVE-2026-42013

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#23075 · Revision 1
Added to Heist Feed
Publisher date
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