UnratedFix available
Fix CVE(s): CVE-2026-11856
Type: advisorySources: OSV
* SECURITY UPDATE: cross-origin Digest authentication state leak - debian/patches/CVE-2026-11856.patch: flush the cached Digest state in lib/http_digest.c, lib/urldata.h and lib/curl_sasl.c when the origin or credentials it was created for change on a reused handle, so an Authorization/Proxy-Authorization header is not sent to a different origin. - CVE-2026-11856
- Products
- curl, libcurl3, libcurl3-gnutls, libcurl3-nss, libcurl4-doc, libcurl4-gnutls-dev, libcurl4-nss-dev, libcurl4-openssl-dev
- Affected versions
- Not specified
- Fixed versions
- 7.47.0-1ubuntu2.23+tuxcare.els16
- CVEs
- CVE-2026-11856
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:09 UTC · Revision 1
Source evidence
* SECURITY UPDATE: cross-origin Digest authentication state leak - debian/patches/CVE-2026-11856.patch: flush the cached Digest state in lib/http_digest.c, lib/urldata.h and lib/curl_sasl.c when the origin or credentials it was created for change on a reused handle, so an Authorization/Proxy-Authorization header is not sent to a different origin. - CVE-2026-11856
osv:CLSA-2026-1783937975
curl
Fixed versions: 7.47.0-1ubuntu2.23+tuxcare.els16
libcurl3
Fixed versions: 7.47.0-1ubuntu2.23+tuxcare.els16
libcurl3-gnutls
Fixed versions: 7.47.0-1ubuntu2.23+tuxcare.els16
libcurl3-nss
Fixed versions: 7.47.0-1ubuntu2.23+tuxcare.els16
libcurl4-doc
Fixed versions: 7.47.0-1ubuntu2.23+tuxcare.els16
libcurl4-gnutls-dev
Fixed versions: 7.47.0-1ubuntu2.23+tuxcare.els16
libcurl4-nss-dev
Fixed versions: 7.47.0-1ubuntu2.23+tuxcare.els16
libcurl4-openssl-dev
Fixed versions: 7.47.0-1ubuntu2.23+tuxcare.els16
Complete source record
{
"id": "4b5db5440553fb6e91dddd8c81bd8edf596868d88a766af5339280b926999c5b",
"url": "https://osv.dev/vulnerability/CLSA-2026-1783937975",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Fix CVE(s): CVE-2026-11856",
"summary": "* SECURITY UPDATE: cross-origin Digest authentication state leak - debian/patches/CVE-2026-11856.patch: flush the cached Digest state in lib/http_digest.c, lib/urldata.h and lib/curl_sasl.c when the origin or credentials it was created for change on a reused handle, so an Authorization/Proxy-Authorization header is not sent to a different origin. - CVE-2026-11856",
"evidence": "osv:CLSA-2026-1783937975",
"products": [
{
"name": {
"value": "curl",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "7.47.0-1ubuntu2.23+tuxcare.els16",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libcurl3",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "7.47.0-1ubuntu2.23+tuxcare.els16",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libcurl3-gnutls",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "7.47.0-1ubuntu2.23+tuxcare.els16",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libcurl3-nss",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "7.47.0-1ubuntu2.23+tuxcare.els16",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libcurl4-doc",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "7.47.0-1ubuntu2.23+tuxcare.els16",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libcurl4-gnutls-dev",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "7.47.0-1ubuntu2.23+tuxcare.els16",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libcurl4-nss-dev",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "7.47.0-1ubuntu2.23+tuxcare.els16",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libcurl4-openssl-dev",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "7.47.0-1ubuntu2.23+tuxcare.els16",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1783937975",
"aliases": [
"CLSA-2026-1783937975"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "7.47.0-1ubuntu2.23+tuxcare.els16"
}
]
}
],
"package": {
"name": "curl",
"purl": "pkg:deb/tuxcare/curl?distro=ubuntu-16.04",
"ecosystem": "TuxCare:Ubuntu:16.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1783937975.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "7.47.0-1ubuntu2.23+tuxcare.els16"
}
]
}
],
"package": {
"name": "libcurl3",
"purl": "pkg:deb/tuxcare/libcurl3?distro=ubuntu-16.04",
"ecosystem": "TuxCare:Ubuntu:16.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1783937975.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "7.47.0-1ubuntu2.23+tuxcare.els16"
}
]
}
],
"package": {
"name": "libcurl3-gnutls",
"purl": "pkg:deb/tuxcare/libcurl3-gnutls?distro=ubuntu-16.04",
"ecosystem": "TuxCare:Ubuntu:16.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1783937975.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "7.47.0-1ubuntu2.23+tuxcare.els16"
}
]
}
],
"package": {
"name": "libcurl3-nss",
"purl": "pkg:deb/tuxcare/libcurl3-nss?distro=ubuntu-16.04",
"ecosystem": "TuxCare:Ubuntu:16.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1783937975.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "7.47.0-1ubuntu2.23+tuxcare.els16"
}
]
}
],
"package": {
"name": "libcurl4-doc",
"purl": "pkg:deb/tuxcare/libcurl4-doc?distro=ubuntu-16.04",
"ecosystem": "TuxCare:Ubuntu:16.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1783937975.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "7.47.0-1ubuntu2.23+tuxcare.els16"
}
]
}
],
"package": {
"name": "libcurl4-gnutls-dev",
"purl": "pkg:deb/tuxcare/libcurl4-gnutls-dev?distro=ubuntu-16.04",
"ecosystem": "TuxCare:Ubuntu:16.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1783937975.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "7.47.0-1ubuntu2.23+tuxcare.els16"
}
]
}
],
"package": {
"name": "libcurl4-nss-dev",
"purl": "pkg:deb/tuxcare/libcurl4-nss-dev?distro=ubuntu-16.04",
"ecosystem": "TuxCare:Ubuntu:16.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1783937975.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "7.47.0-1ubuntu2.23+tuxcare.els16"
}
]
}
],
"package": {
"name": "libcurl4-openssl-dev",
"purl": "pkg:deb/tuxcare/libcurl4-openssl-dev?distro=ubuntu-16.04",
"ecosystem": "TuxCare:Ubuntu:16.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1783937975.json"
}
}
],
"modified": "2026-10-26T09:31:47.110312236Z",
"provider": "osv",
"upstream": [
"CVE-2026-11856"
],
"references": [
"https://errata.tuxcare.com/els_os/ubuntu16.04els/CLSA-2026-1783937975.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-11856"
]
},
"related_cves": [
{
"value": "CVE-2026-11856",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 448472,
"published_at": "2026-07-13T10:19:50+00:00"
}