CVE catalog

CVE-2026-88648

Incomplete X.509 implementation in GnuTLS v3.8.13…

Incomplete X.509 implementation in GnuTLS v3.8.13 allows attackers controlling a subordinate Certificate Authority to bypass cross-domain PKI restrictions and issue unauthorized certificates.

Severity: High · CVSS 7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Published: Oct 8, 2026, 12:00:00 AM UTC
Updated: Oct 8, 2026, 7:20:52 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.20% · Oct 27, 2026

Projects and upstream resources

[gnutls28][Source-reported homepage]

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": "gnutls28",
      "status": "vulnerable",
      "release": "sid",
      "version": "3.8.13-1"
    },
    {
      "name": "gnutls28",
      "status": "vulnerable",
      "release": "forky",
      "version": "3.8.13-1"
    },
    {
      "name": "gnutls28",
      "status": "vulnerable",
      "release": "trixie",
      "version": "3.8.9-3+deb13u4"
    },
    {
      "name": "gnutls28",
      "status": "vulnerable",
      "release": "trixie-security",
      "version": "3.8.9-3+deb13u4"
    },
    {
      "name": "gnutls28",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "3.7.9-2+deb12u7"
    },
    {
      "name": "gnutls28",
      "status": "vulnerable",
      "release": "bookworm-security",
      "version": "3.7.9-2+deb12u7"
    }
  ],
  "fixed_versions": [
    {
      "bug": 1150522,
      "name": "gnutls28",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "unimportant",
      "fixed_version": ""
    },
    {
      "bug": 1150522,
      "name": "gnutls28",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "unimportant",
      "fixed_version": ""
    },
    {
      "bug": 1150522,
      "name": "gnutls28",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "unimportant",
      "fixed_version": ""
    },
    {
      "bug": 1150522,
      "name": "gnutls28",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "unimportant",
      "fixed_version": ""
    }
  ],
  "distribution_packages": [
    {
      "name": "gnutls26",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "pro",
      "versions": [
        "2.12.23-1ubuntu4",
        "2.12.23-1ubuntu5",
        "2.12.23-12ubuntu1",
        "2.12.23-12ubuntu2",
        "2.12.23-12ubuntu2.1",
        "2.12.23-12ubuntu2.2",
        "2.12.23-12ubuntu2.3",
        "2.12.23-12ubuntu2.4",
        "2.12.23-12ubuntu2.5",
        "2.12.23-12ubuntu2.6",
        "2.12.23-12ubuntu2.7",
        "2.12.23-12ubuntu2.8",
        "2.12.23-12ubuntu2.10+esm1"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-88648"
    },
    {
      "name": "gnutls28",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "pro",
      "versions": [
        "3.8.3-1.1ubuntu3.1+Fips1",
        "3.8.3-1.1ubuntu3.4+Fips1",
        "3.8.3-1.1ubuntu3.4+Fips1.1",
        "3.8.3-1.1ubuntu3.5+Fips1.1",
        "3.8.3-1.1ubuntu3.6+Fips1.2"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-88648"
    },
    {
      "name": "gnutls28",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "22.04",
      "versions": [
        "3.7.1-5ubuntu1",
        "3.7.2-2ubuntu1",
        "3.7.2-4ubuntu1",
        "3.7.2-5ubuntu1",
        "3.7.3-4ubuntu1",
        "3.7.3-4ubuntu1.1",
        "3.7.3-4ubuntu1.2",
        "3.7.3-4ubuntu1.3",
        "3.7.3-4ubuntu1.4",
        "3.7.3-4ubuntu1.5",
        "3.7.3-4ubuntu1.6",
        "3.7.3-4ubuntu1.7",
        "3.7.3-4ubuntu1.8",
        "3.7.3-4ubuntu1.9"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-88648"
    },
    {
      "name": "gnutls28",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "24.04",
      "versions": [
        "3.8.1-4ubuntu1",
        "3.8.1-4ubuntu6",
        "3.8.1-4ubuntu7",
        "3.8.3-1ubuntu1",
        "3.8.3-1.1ubuntu2",
        "3.8.3-1.1ubuntu3",
        "3.8.3-1.1ubuntu3.1",
        "3.8.3-1.1ubuntu3.2",
        "3.8.3-1.1ubuntu3.3",
        "3.8.3-1.1ubuntu3.4",
        "3.8.3-1.1ubuntu3.5",
        "3.8.3-1.1ubuntu3.6"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-88648"
    },
    {
      "name": "gnutls28",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "26.10",
      "versions": [
        "3.8.12-2ubuntu1",
        "3.8.12-2ubuntu1.1",
        "3.8.13-1ubuntu1"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-88648"
    },
    {
      "name": "gnutls28",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "26.04",
      "versions": [
        "3.8.9-3ubuntu2",
        "3.8.10-3ubuntu1",
        "3.8.12-2ubuntu1",
        "3.8.12-2ubuntu1.1"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-88648"
    }
  ]
}

[Debian bug #1150522]

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[gnutls-bin]Unknown
Source package: [gnutls28]
Details (4)
- 3.7.9-2+deb12u7 · amd64 · bookworm
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
- 3.7.9-2+deb12u7 · arm64 · bookworm
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
- 3.7.9-2+deb12u7 · amd64 · bookworm-security
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
- 3.7.9-2+deb12u7 · arm64 · bookworm-security
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
[gnutls-doc]Unknown
Source package: [gnutls28]
Details (4)
- 3.7.9-2+deb12u7 · all · bookworm
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
- 3.7.9-2+deb12u7 · all · bookworm
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
- 3.7.9-2+deb12u7 · all · bookworm-security
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
- 3.7.9-2+deb12u7 · all · bookworm-security
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
[guile-gnutls]Unknown
Source package: [gnutls28]
Details (4)
- 3.7.9-2+deb12u7 · amd64 · bookworm
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
- 3.7.9-2+deb12u7 · arm64 · bookworm
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
- 3.7.9-2+deb12u7 · amd64 · bookworm-security
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
- 3.7.9-2+deb12u7 · arm64 · bookworm-security
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
[libgnutls28-dev]Unknown
Source package: [gnutls28]
Details (4)
- 3.7.9-2+deb12u7 · amd64 · bookworm
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
- 3.7.9-2+deb12u7 · arm64 · bookworm
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
- 3.7.9-2+deb12u7 · amd64 · bookworm-security
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
- 3.7.9-2+deb12u7 · arm64 · bookworm-security
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
[libgnutls30]Unknown
Source package: [gnutls28]
Details (4)
- 3.7.9-2+deb12u7 · amd64 · bookworm
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
- 3.7.9-2+deb12u7 · arm64 · bookworm
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
- 3.7.9-2+deb12u7 · amd64 · bookworm-security
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
- 3.7.9-2+deb12u7 · arm64 · bookworm-security
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
[libgnutls-dane0]Unknown
Source package: [gnutls28]
Details (4)
- 3.7.9-2+deb12u7 · amd64 · bookworm
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
- 3.7.9-2+deb12u7 · arm64 · bookworm
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
- 3.7.9-2+deb12u7 · amd64 · bookworm-security
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
- 3.7.9-2+deb12u7 · arm64 · bookworm-security
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
[libgnutls-openssl27]Unknown
Source package: [gnutls28]
Details (4)
- 3.7.9-2+deb12u7 · amd64 · bookworm
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
- 3.7.9-2+deb12u7 · arm64 · bookworm
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
- 3.7.9-2+deb12u7 · amd64 · bookworm-security
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
- 3.7.9-2+deb12u7 · arm64 · bookworm-security
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
[libgnutlsxx30]Unknown
Source package: [gnutls28]
Details (4)
- 3.7.9-2+deb12u7 · amd64 · bookworm
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
- 3.7.9-2+deb12u7 · arm64 · bookworm
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
- 3.7.9-2+deb12u7 · amd64 · bookworm-security
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12
- 3.7.9-2+deb12u7 · arm64 · bookworm-security
  Affected
  nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

[Debian 13 (Trixie)]

[gnutls-bin]Unknown
Source package: [gnutls28]
Details (4)
- 3.8.9-3+deb13u4 · amd64 · trixie
  Affected
  nvd · gnutls28 · debian · 13
- 3.8.9-3+deb13u4 · arm64 · trixie
  Affected
  nvd · gnutls28 · debian · 13
- 3.8.9-3+deb13u4 · amd64 · trixie-security
  Affected
  nvd · gnutls28 · debian · 13
- 3.8.9-3+deb13u4 · arm64 · trixie-security
  Affected
  nvd · gnutls28 · debian · 13
[gnutls-doc]Unknown
Source package: [gnutls28]
Details (4)
- 3.8.9-3+deb13u4 · all · trixie
  Affected
  nvd · gnutls28 · debian · 13
- 3.8.9-3+deb13u4 · all · trixie
  Affected
  nvd · gnutls28 · debian · 13
- 3.8.9-3+deb13u4 · all · trixie-security
  Affected
  nvd · gnutls28 · debian · 13
- 3.8.9-3+deb13u4 · all · trixie-security
  Affected
  nvd · gnutls28 · debian · 13
[libgnutls28-dev]Unknown
Source package: [gnutls28]
Details (4)
- 3.8.9-3+deb13u4 · amd64 · trixie
  Affected
  nvd · gnutls28 · debian · 13
- 3.8.9-3+deb13u4 · arm64 · trixie
  Affected
  nvd · gnutls28 · debian · 13
- 3.8.9-3+deb13u4 · amd64 · trixie-security
  Affected
  nvd · gnutls28 · debian · 13
- 3.8.9-3+deb13u4 · arm64 · trixie-security
  Affected
  nvd · gnutls28 · debian · 13
[libgnutls30t64]Unknown
Source package: [gnutls28]
Details (4)
- 3.8.9-3+deb13u4 · amd64 · trixie
  Affected
  nvd · gnutls28 · debian · 13
- 3.8.9-3+deb13u4 · arm64 · trixie
  Affected
  nvd · gnutls28 · debian · 13
- 3.8.9-3+deb13u4 · amd64 · trixie-security
  Affected
  nvd · gnutls28 · debian · 13
- 3.8.9-3+deb13u4 · arm64 · trixie-security
  Affected
  nvd · gnutls28 · debian · 13
[libgnutls-dane0t64]Unknown
Source package: [gnutls28]
Details (4)
- 3.8.9-3+deb13u4 · amd64 · trixie
  Affected
  nvd · gnutls28 · debian · 13
- 3.8.9-3+deb13u4 · arm64 · trixie
  Affected
  nvd · gnutls28 · debian · 13
- 3.8.9-3+deb13u4 · amd64 · trixie-security
  Affected
  nvd · gnutls28 · debian · 13
- 3.8.9-3+deb13u4 · arm64 · trixie-security
  Affected
  nvd · gnutls28 · debian · 13
[libgnutls-openssl27t64]Unknown
Source package: [gnutls28]
Details (4)
- 3.8.9-3+deb13u4 · amd64 · trixie
  Affected
  nvd · gnutls28 · debian · 13
- 3.8.9-3+deb13u4 · arm64 · trixie
  Affected
  nvd · gnutls28 · debian · 13
- 3.8.9-3+deb13u4 · amd64 · trixie-security
  Affected
  nvd · gnutls28 · debian · 13
- 3.8.9-3+deb13u4 · arm64 · trixie-security
  Affected
  nvd · gnutls28 · debian · 13

Observed: Oct 27, 2026, 4:45:58 AM UTC

References

[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]