Emacs: emacs: arbitrary code execution in flymake mode

{
  "id": "85583dd719c8befc9d8e07ed767ac020df3ba25667651445c6ef437cc0f70891",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-96442",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Emacs: emacs: arbitrary code execution in flymake mode",
    "summary": "A code execution flaw was found in Emacs, affecting versions prior to 31.2. The Flymake mode using language backends other than Lisp would execute arbitrary code from the edited file while performing syntax checking. Viewing or editing untrusted files using Emacs could lead to arbitrary code execution with the privileges of the user running Emacs.",
    "evidence": "cve:CVE-2026-96442",
    "products": [
      {
        "name": {
          "value": "GNU Emacs",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      },
      {
        "name": {
          "value": "Red Hat Enterprise Linux 10",
          "evidence": "/containers/cna/affected/1/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      },
      {
        "name": {
          "value": "Red Hat Enterprise Linux 8",
          "evidence": "/containers/cna/affected/2/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      },
      {
        "name": {
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          "evidence": "/containers/cna/affected/3/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      },
      {
        "name": {
          "value": "Red Hat Enterprise Linux 9",
          "evidence": "/containers/cna/affected/4/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      },
      {
        "name": {
          "value": "Red Hat Enterprise Linux 6",
          "evidence": "/containers/cna/affected/5/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      },
      {
        "name": {
          "value": "Red Hat Enterprise Linux 7",
          "evidence": "/containers/cna/affected/6/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-96442",
      "aliases": [
        "CVE-2026-96442"
      ],
      "metrics": [
        {
          "other": {
            "type": "Red Hat severity rating",
            "content": {
              "value": "Important",
              "namespace": "https://access.redhat.com/security/updates/classification/"
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        },
        {
          "format": "CVSS",
          "cvssV3_1": {
            "scope": "UNCHANGED",
            "version": "3.1",
            "baseScore": 7.8,
            "attackVector": "LOCAL",
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "integrityImpact": "HIGH",
            "userInteraction": "REQUIRED",
            "attackComplexity": "LOW",
            "availabilityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "confidentialityImpact": "HIGH"
          }
        }
      ],
      "affected": [
        {
          "vendor": "GNU Emacs",
          "product": "GNU Emacs",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "31.2",
              "versionType": "semver"
            }
          ],
          "packageName": "emacs",
          "collectionURL": "https://git.savannah.gnu.org/cgit/emacs.git/",
          "defaultStatus": "unaffected"
        },
        {
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:10.2"
          ],
          "vendor": "Red Hat",
          "product": "Red Hat Enterprise Linux 10",
          "versions": [
            {
              "status": "unaffected",
              "version": "1:29.4-14.el10_2.3",
              "lessThan": "*",
              "versionType": "rpm"
            }
          ],
          "packageName": "emacs",
          "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": "1:26.1-15.el8_10.4",
              "lessThan": "*",
              "versionType": "rpm"
            }
          ],
          "packageName": "emacs",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "defaultStatus": "affected"
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          "vendor": "Red Hat",
          "product": "Red Hat Enterprise Linux 8",
          "versions": [
            {
              "status": "unaffected",
              "version": "1:26.1-15.el8_10.4",
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              "versionType": "rpm"
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          ],
          "packageName": "emacs",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "defaultStatus": "affected"
        },
        {
          "cpes": [
            "cpe:/a:redhat:enterprise_linux:9::appstream"
          ],
          "vendor": "Red Hat",
          "product": "Red Hat Enterprise Linux 9",
          "versions": [
            {
              "status": "unaffected",
              "version": "1:27.2-18.el9_8.3",
              "lessThan": "*",
              "versionType": "rpm"
            }
          ],
          "packageName": "emacs",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "defaultStatus": "affected"
        },
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          "cpes": [
            "cpe:/o:redhat:enterprise_linux:6"
          ],
          "vendor": "Red Hat",
          "product": "Red Hat Enterprise Linux 6",
          "packageName": "emacs",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "defaultStatus": "unknown"
        },
        {
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:7"
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          "product": "Red Hat Enterprise Linux 7",
          "packageName": "emacs",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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      ],
      "modified": "2026-10-27T21:52:56.000Z",
      "provider": "cve",
      "references": [
        "https://access.redhat.com/errata/RHSA-2026:84591",
        "https://access.redhat.com/errata/RHSA-2026:85245",
        "https://access.redhat.com/errata/RHSA-2026:90800",
        "https://access.redhat.com/security/cve/CVE-2026-96442",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2537347",
        "https://github.com/emacs-mirror/emacs/commit/135e6f63f08fee3d374fa1a5187bce941a2d3e3c",
        "https://github.com/emacs-mirror/emacs/commit/abc802ee2eb0b1663349ddf22a461f8e54a383fb",
        "https://www.openwall.com/lists/oss-security/2026/09/14/1"
      ],
      "provider_metadata": {
        "adp": [
          {
            "title": "CISA ADP Vulnrichment",
            "metrics": [
              {
                "other": {
                  "type": "ssvc",
                  "content": {
                    "id": "CVE-2026-96442",
                    "role": "CISA Coordinator",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "version": "2.0.3",
                    "timestamp": "2026-09-23T13:54:08.909184Z"
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            ],
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        "cna": {
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    "related_cves": [
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        "value": "CVE-2026-96442",
        "evidence": "/cveMetadata/cveId"
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    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 400616,
  "published_at": "2026-09-23T10:10:36.734+00:00"
}