CVE catalog
CVE-2026-50012
Squid is a caching proxy for the Web. Prior to 7.6…
Squid is a caching proxy for the Web. Prior to 7.6, due to an improper input validation bug in cache digest reply handling (peerDigestSwapInMask in src/peer_digest.cc), Squid is vulnerable to a heap-based buffer overflow: a cache digest's on-the-wire size may be larger than the mask_size declared within the digest, so a trusted peer sending a maliciously crafted reply to a cache_digest request message can trigger the overflow. This attack is limited to Squid instances compiled with the --enable-cache-digests option and configured with cache_peer entries. This issue is fixed in version 7.6.
- Severity
- Critical · CVSS 9.2
- Published
- Source
- [NVD] · [CVE record]
- EPSS
- 1.36% · Oct 27, 2026
Projects and upstream resources
Reported versions and fixes
Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.
Version impact has not been established. The original provider fields are retained below.
Provider details and historical evidence
Original provider fields
{
"package_releases": [
{
"name": "squid",
"status": "fixed",
"release": "sid",
"version": "7.7-1"
},
{
"name": "squid",
"status": "fixed",
"release": "forky",
"version": "7.7-1"
},
{
"name": "squid",
"status": "fixed",
"release": "trixie",
"version": "6.13-2+deb13u3"
},
{
"name": "squid",
"status": "fixed",
"release": "trixie-security",
"version": "6.13-2+deb13u2"
},
{
"name": "squid",
"status": "vulnerable",
"release": "bookworm",
"version": "5.7-2+deb12u5"
},
{
"name": "squid",
"status": "fixed",
"release": "bookworm-security",
"version": "5.7-2+deb12u6"
}
],
"fixed_versions": [
{
"bug": null,
"name": "squid",
"type": "source",
"origin": null,
"release": "sid",
"urgency": "not yet assigned",
"fixed_version": "7.6-1"
},
{
"bug": null,
"name": "squid",
"type": "source",
"origin": null,
"release": "forky",
"urgency": "not yet assigned",
"fixed_version": "7.6-1"
},
{
"bug": null,
"name": "squid",
"type": "source",
"origin": null,
"release": "trixie",
"urgency": "not yet assigned",
"fixed_version": "6.13-2+deb13u2"
},
{
"bug": null,
"name": "squid",
"type": "source",
"origin": null,
"release": "bookworm",
"urgency": "not yet assigned",
"fixed_version": "5.7-2+deb12u6"
}
],
"distribution_packages": [
{
"name": "squid",
"ecosystem": "cpe",
"fixed_version": "not yet fixed"
},
{
"name": "squid",
"distro": "ubuntu",
"ranges": [
{
"fixed": "6.14-0ubuntu0.24.04.5",
"introduced": "0"
}
],
"release": "noble",
"ecosystem": "deb",
"fixed_version": "6.14-0ubuntu0.24.04.5"
},
{
"name": "squid-cgi",
"distro": "ubuntu",
"ranges": [
{
"fixed": "6.14-0ubuntu0.24.04.5",
"introduced": "0"
}
],
"release": "noble",
"ecosystem": "deb",
"fixed_version": "6.14-0ubuntu0.24.04.5"
},
{
"name": "squid-common",
"distro": "ubuntu",
"ranges": [
{
"fixed": "6.14-0ubuntu0.24.04.5",
"introduced": "0"
}
],
"release": "noble",
"ecosystem": "deb",
"fixed_version": "6.14-0ubuntu0.24.04.5"
},
{
"name": "squid-openssl",
"distro": "ubuntu",
"ranges": [
{
"fixed": "6.14-0ubuntu0.24.04.5",
"introduced": "0"
}
],
"release": "noble",
"ecosystem": "deb",
"fixed_version": "6.14-0ubuntu0.24.04.5"
},
{
"name": "squid-purge",
"distro": "ubuntu",
"ranges": [
{
"fixed": "6.14-0ubuntu0.24.04.5",
"introduced": "0"
}
],
"release": "noble",
"ecosystem": "deb",
"fixed_version": "6.14-0ubuntu0.24.04.5"
},
{
"name": "squidclient",
"distro": "ubuntu",
"ranges": [
{
"fixed": "6.14-0ubuntu0.24.04.5",
"introduced": "0"
}
],
"release": "noble",
"ecosystem": "deb",
"fixed_version": "6.14-0ubuntu0.24.04.5"
},
{
"name": "squid",
"distro": "alpine",
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "7.6-r0"
}
]
}
],
"release": "3.23",
"versions": [],
"ecosystem": "apk",
"fixed_version": "7.6-r0",
"provider_record_id": "ALPINE-CVE-2026-50012"
},
{
"name": "squid",
"distro": "alpine",
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "7.6-r0"
}
]
}
],
"release": "3.24",
"versions": [],
"ecosystem": "apk",
"fixed_version": "7.6-r0",
"provider_record_id": "ALPINE-CVE-2026-50012"
},
{
"name": "squid3",
"distro": "ubuntu",
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.27-1ubuntu1.14+esm6"
}
]
}
],
"release": "pro",
"versions": [
"3.5.23-5ubuntu1",
"3.5.23-5ubuntu2",
"3.5.27-1ubuntu1",
"3.5.27-1ubuntu1.1",
"3.5.27-1ubuntu1.2",
"3.5.27-1ubuntu1.3",
"3.5.27-1ubuntu1.4",
"3.5.27-1ubuntu1.5",
"3.5.27-1ubuntu1.6",
"3.5.27-1ubuntu1.7",
"3.5.27-1ubuntu1.8",
"3.5.27-1ubuntu1.9",
"3.5.27-1ubuntu1.10",
"3.5.27-1ubuntu1.11",
"3.5.27-1ubuntu1.12",
"3.5.27-1ubuntu1.13",
"3.5.27-1ubuntu1.14",
"3.5.27-1ubuntu1.14+esm1",
"3.5.27-1ubuntu1.14+esm2",
"3.5.27-1ubuntu1.14+esm3",
"3.5.27-1ubuntu1.14+esm4",
"3.5.27-1ubuntu1.14+esm5"
],
"ecosystem": "deb",
"fixed_version": "3.5.27-1ubuntu1.14+esm6",
"provider_record_id": "UBUNTU-CVE-2026-50012"
},
{
"name": "squid",
"distro": "ubuntu",
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.10-1ubuntu1.13+esm3"
}
]
}
],
"release": "pro",
"versions": [
"4.8-1ubuntu2",
"4.8-1ubuntu3",
"4.9-2ubuntu1",
"4.9-2ubuntu2",
"4.9-2ubuntu3",
"4.9-2ubuntu4",
"4.10-1ubuntu1",
"4.10-1ubuntu1.1",
"4.10-1ubuntu1.2",
"4.10-1ubuntu1.3",
"4.10-1ubuntu1.4",
"4.10-1ubuntu1.5",
"4.10-1ubuntu1.6",
"4.10-1ubuntu1.7",
"4.10-1ubuntu1.8",
"4.10-1ubuntu1.9",
"4.10-1ubuntu1.10",
"4.10-1ubuntu1.11",
"4.10-1ubuntu1.12",
"4.10-1ubuntu1.13",
"4.10-1ubuntu1.13+esm1",
"4.10-1ubuntu1.13+esm2"
],
"ecosystem": "deb",
"fixed_version": "4.10-1ubuntu1.13+esm3",
"provider_record_id": "UBUNTU-CVE-2026-50012"
},
{
"name": "squid",
"distro": "ubuntu",
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "5.9-0ubuntu0.22.04.7"
}
]
}
],
"release": "22.04",
"versions": [
"4.13-10ubuntu5",
"5.2-1ubuntu1",
"5.2-1ubuntu3",
"5.2-1ubuntu4",
"5.2-1ubuntu4.1",
"5.2-1ubuntu4.2",
"5.2-1ubuntu4.3",
"5.7-0ubuntu0.22.04.1",
"5.7-0ubuntu0.22.04.2",
"5.7-0ubuntu0.22.04.3",
"5.7-0ubuntu0.22.04.4",
"5.9-0ubuntu0.22.04.1",
"5.9-0ubuntu0.22.04.2",
"5.9-0ubuntu0.22.04.3",
"5.9-0ubuntu0.22.04.4",
"5.9-0ubuntu0.22.04.5"
],
"ecosystem": "deb",
"fixed_version": "5.9-0ubuntu0.22.04.7",
"provider_record_id": "UBUNTU-CVE-2026-50012"
},
{
"name": "squid",
"distro": "ubuntu",
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "6.14-0ubuntu0.24.04.4"
}
]
}
],
"release": "24.04",
"versions": [
"6.1-2ubuntu1",
"6.1-2ubuntu2",
"6.5-1ubuntu1",
"6.5-1ubuntu2",
"6.5-1ubuntu3",
"6.6-1ubuntu4",
"6.6-1ubuntu5",
"6.6-1ubuntu5.1",
"6.10-0ubuntu0.24.04.1",
"6.13-0ubuntu0.24.04.1",
"6.13-0ubuntu0.24.04.2",
"6.13-0ubuntu0.24.04.3",
"6.14-0ubuntu0.24.04.1",
"6.14-0ubuntu0.24.04.2"
],
"ecosystem": "deb",
"fixed_version": "6.14-0ubuntu0.24.04.4",
"provider_record_id": "UBUNTU-CVE-2026-50012"
},
{
"name": "squid",
"distro": "ubuntu",
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "6.14-0ubuntu0.25.10.4"
}
]
}
],
"release": "25.10",
"versions": [
"6.13-1ubuntu1",
"6.13-1ubuntu2",
"6.13-1ubuntu3",
"6.13-1ubuntu4",
"6.13-1ubuntu4.1",
"6.14-0ubuntu0.25.10.1",
"6.14-0ubuntu0.25.10.2"
],
"ecosystem": "deb",
"fixed_version": "6.14-0ubuntu0.25.10.4",
"provider_record_id": "UBUNTU-CVE-2026-50012"
},
{
"name": "squid",
"distro": "ubuntu",
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "7.2-2ubuntu2.2"
}
]
}
],
"release": "26.04",
"versions": [
"6.13-1ubuntu4",
"6.13-1ubuntu5",
"7.2-2ubuntu1",
"7.2-2ubuntu2"
],
"ecosystem": "deb",
"fixed_version": "7.2-2ubuntu2.2",
"provider_record_id": "UBUNTU-CVE-2026-50012"
},
{
"name": "squid",
"ranges": [
{
"fixed": "7.6",
"introduced": "",
"last_affected": "",
"start_excluding": ""
}
],
"ecosystem": "cpe",
"fixed_version": "7.6",
"provider_record_id": "NVD-CVE-2026-50012"
}
]
}OpenFactory catalog packages
Matching against OpenFactory catalog package versions is in progress.
[Debian 12 (Bookworm)]
- [squid]Unknown
Details (4)
5.7-2+deb12u5· amd64 · bookwormAffected · Fixed:
5.7-2+deb12u6nvd · squid · debian · bookworm; nvd · squid · debian · 12
5.7-2+deb12u5· arm64 · bookwormAffected · Fixed:
5.7-2+deb12u6nvd · squid · debian · bookworm; nvd · squid · debian · 12
5.7-2+deb12u6· amd64 · bookworm-securityFixed · Fixed:
5.7-2+deb12u6nvd · squid · debian · bookworm; nvd · squid · debian · 12
5.7-2+deb12u6· arm64 · bookworm-securityFixed · Fixed:
5.7-2+deb12u6nvd · squid · debian · bookworm; nvd · squid · debian · 12
- [squid-cgi]Unknown
Source package: [squid]
Details (4)
5.7-2+deb12u5· amd64 · bookwormAffected · Fixed:
5.7-2+deb12u6nvd · squid · debian · bookworm; nvd · squid · debian · 12
5.7-2+deb12u5· arm64 · bookwormAffected · Fixed:
5.7-2+deb12u6nvd · squid · debian · bookworm; nvd · squid · debian · 12
5.7-2+deb12u6· amd64 · bookworm-securityFixed · Fixed:
5.7-2+deb12u6nvd · squid · debian · bookworm; nvd · squid · debian · 12
5.7-2+deb12u6· arm64 · bookworm-securityFixed · Fixed:
5.7-2+deb12u6nvd · squid · debian · bookworm; nvd · squid · debian · 12
- [squidclient]Unknown
Source package: [squid]
Details (4)
5.7-2+deb12u5· amd64 · bookwormAffected · Fixed:
5.7-2+deb12u6nvd · squid · debian · bookworm; nvd · squid · debian · 12
5.7-2+deb12u5· arm64 · bookwormAffected · Fixed:
5.7-2+deb12u6nvd · squid · debian · bookworm; nvd · squid · debian · 12
5.7-2+deb12u6· amd64 · bookworm-securityFixed · Fixed:
5.7-2+deb12u6nvd · squid · debian · bookworm; nvd · squid · debian · 12
5.7-2+deb12u6· arm64 · bookworm-securityFixed · Fixed:
5.7-2+deb12u6nvd · squid · debian · bookworm; nvd · squid · debian · 12
- [squid-common]Unknown
Source package: [squid]
Details (4)
5.7-2+deb12u5· all · bookwormAffected · Fixed:
5.7-2+deb12u6nvd · squid · debian · bookworm; nvd · squid · debian · 12
5.7-2+deb12u5· all · bookwormAffected · Fixed:
5.7-2+deb12u6nvd · squid · debian · bookworm; nvd · squid · debian · 12
5.7-2+deb12u6· all · bookworm-securityFixed · Fixed:
5.7-2+deb12u6nvd · squid · debian · bookworm; nvd · squid · debian · 12
5.7-2+deb12u6· all · bookworm-securityFixed · Fixed:
5.7-2+deb12u6nvd · squid · debian · bookworm; nvd · squid · debian · 12
- [squid-openssl]Unknown
Source package: [squid]
Details (4)
5.7-2+deb12u5· amd64 · bookwormAffected · Fixed:
5.7-2+deb12u6nvd · squid · debian · bookworm; nvd · squid · debian · 12
5.7-2+deb12u5· arm64 · bookwormAffected · Fixed:
5.7-2+deb12u6nvd · squid · debian · bookworm; nvd · squid · debian · 12
5.7-2+deb12u6· amd64 · bookworm-securityFixed · Fixed:
5.7-2+deb12u6nvd · squid · debian · bookworm; nvd · squid · debian · 12
5.7-2+deb12u6· arm64 · bookworm-securityFixed · Fixed:
5.7-2+deb12u6nvd · squid · debian · bookworm; nvd · squid · debian · 12
- [squid-purge]Unknown
Source package: [squid]
Details (4)
5.7-2+deb12u5· amd64 · bookwormAffected · Fixed:
5.7-2+deb12u6nvd · squid · debian · bookworm; nvd · squid · debian · 12
5.7-2+deb12u5· arm64 · bookwormAffected · Fixed:
5.7-2+deb12u6nvd · squid · debian · bookworm; nvd · squid · debian · 12
5.7-2+deb12u6· amd64 · bookworm-securityFixed · Fixed:
5.7-2+deb12u6nvd · squid · debian · bookworm; nvd · squid · debian · 12
5.7-2+deb12u6· arm64 · bookworm-securityFixed · Fixed:
5.7-2+deb12u6nvd · squid · debian · bookworm; nvd · squid · debian · 12
[Debian 13 (Trixie)]
- [squid]Unknown
Details (4)
6.13-2+deb13u2· amd64 · trixieFixed · Fixed:
6.13-2+deb13u2nvd · squid · debian · 13
6.13-2+deb13u2· arm64 · trixieFixed · Fixed:
6.13-2+deb13u2nvd · squid · debian · 13
6.13-2+deb13u2· amd64 · trixie-securityFixed · Fixed:
6.13-2+deb13u2nvd · squid · debian · 13
6.13-2+deb13u2· arm64 · trixie-securityFixed · Fixed:
6.13-2+deb13u2nvd · squid · debian · 13
- [squid-cgi]Unknown
Source package: [squid]
Details (4)
6.13-2+deb13u2· amd64 · trixieFixed · Fixed:
6.13-2+deb13u2nvd · squid · debian · 13
6.13-2+deb13u2· arm64 · trixieFixed · Fixed:
6.13-2+deb13u2nvd · squid · debian · 13
6.13-2+deb13u2· amd64 · trixie-securityFixed · Fixed:
6.13-2+deb13u2nvd · squid · debian · 13
6.13-2+deb13u2· arm64 · trixie-securityFixed · Fixed:
6.13-2+deb13u2nvd · squid · debian · 13
- [squidclient]Unknown
Source package: [squid]
Details (4)
6.13-2+deb13u2· amd64 · trixieFixed · Fixed:
6.13-2+deb13u2nvd · squid · debian · 13
6.13-2+deb13u2· arm64 · trixieFixed · Fixed:
6.13-2+deb13u2nvd · squid · debian · 13
6.13-2+deb13u2· amd64 · trixie-securityFixed · Fixed:
6.13-2+deb13u2nvd · squid · debian · 13
6.13-2+deb13u2· arm64 · trixie-securityFixed · Fixed:
6.13-2+deb13u2nvd · squid · debian · 13
- [squid-common]Unknown
Source package: [squid]
Details (4)
6.13-2+deb13u2· all · trixieFixed · Fixed:
6.13-2+deb13u2nvd · squid · debian · 13
6.13-2+deb13u2· all · trixieFixed · Fixed:
6.13-2+deb13u2nvd · squid · debian · 13
6.13-2+deb13u2· all · trixie-securityFixed · Fixed:
6.13-2+deb13u2nvd · squid · debian · 13
6.13-2+deb13u2· all · trixie-securityFixed · Fixed:
6.13-2+deb13u2nvd · squid · debian · 13
- [squid-openssl]Unknown
Source package: [squid]
Details (4)
6.13-2+deb13u2· amd64 · trixieFixed · Fixed:
6.13-2+deb13u2nvd · squid · debian · 13
6.13-2+deb13u2· arm64 · trixieFixed · Fixed:
6.13-2+deb13u2nvd · squid · debian · 13
6.13-2+deb13u2· amd64 · trixie-securityFixed · Fixed:
6.13-2+deb13u2nvd · squid · debian · 13
6.13-2+deb13u2· arm64 · trixie-securityFixed · Fixed:
6.13-2+deb13u2nvd · squid · debian · 13
- [squid-purge]Unknown
Source package: [squid]
Details (4)
6.13-2+deb13u2· amd64 · trixieFixed · Fixed:
6.13-2+deb13u2nvd · squid · debian · 13
6.13-2+deb13u2· arm64 · trixieFixed · Fixed:
6.13-2+deb13u2nvd · squid · debian · 13
6.13-2+deb13u2· amd64 · trixie-securityFixed · Fixed:
6.13-2+deb13u2nvd · squid · debian · 13
6.13-2+deb13u2· arm64 · trixie-securityFixed · Fixed:
6.13-2+deb13u2nvd · squid · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11937-1.json]
- [https://github.com/squid-cache/squid/commit/19fcfe922717c8b255270c032dcde4071c003bcd]
- [https://github.com/squid-cache/squid/pull/2423]
- [https://github.com/squid-cache/squid/releases/tag/SQUID_7_6]
- [https://github.com/squid-cache/squid/security/advisories/GHSA-5vmx-9x64-9284]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-50012]
- [https://osv.dev/vulnerability/ALPINE-CVE-2026-50012]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-50012]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-50012]
- [https://security-tracker.debian.org/tracker/CVE-2026-50012]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-50012.json]
- [https://ubuntu.com/security/notices/USN-8941-1]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1920.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]