CVE catalog
CVE-2026-42012
A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted certificate that contains Uniform Resource Identifier (URI) or Service (SRV) Subject Al
- Severity
- High · CVSS 7.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.35% · Oct 25, 2026
A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted certificate that contains Uniform Resource Identifier (URI) or Service (SRV) Subject Alternative Names (SANs). This could cause the certificate validation process to incorrectly fall back to checking DNS hostnames against the Common Name (CN), potentially allowing the attacker to spoof legitimate services or intercept sensitive information.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | gnutls28 | sid | 3.8.13-1 | fixed |
| Debian | gnutls28 | forky | 3.8.13-1 | fixed |
| Debian | gnutls28 | trixie | 3.8.9-3+deb13u4 | fixed |
| Debian | gnutls28 | trixie-security | 3.8.9-3+deb13u4 | fixed |
| Debian | gnutls28 | bookworm | 3.7.9-2+deb12u7 | fixed |
| Debian | gnutls28 | bookworm-security | 3.7.9-2+deb12u7 | fixed |
| Cpe | gnutls28 | Not reported | 3.8.3-1.1ubuntu3.6 | fixed |
| Cpe | gnutls-bin | Not reported | 3.8.3-1.1ubuntu3.6 | fixed |
| Cpe | gnutls-doc | Not reported | 3.8.3-1.1ubuntu3.6 | fixed |
| Cpe | libgnutls-dane0t64 | Not reported | 3.8.3-1.1ubuntu3.6 | fixed |
| Cpe | libgnutls-openssl27t64 | Not reported | 3.8.3-1.1ubuntu3.6 | fixed |
| Cpe | libgnutls28-dev | Not reported | 3.8.3-1.1ubuntu3.6 | fixed |
| Cpe | libgnutls30t64 | Not reported | 3.8.3-1.1ubuntu3.6 | fixed |
| Alpine | gnutls | 3.20 | 3.8.13-r0 | fixed |
| Alpine | gnutls | 3.21 | 3.8.13-r0 | fixed |
| Alpine | gnutls | 3.22 | 3.8.13-r0 | fixed |
| Alpine | gnutls | 3.23 | 3.8.13-r0 | fixed |
| Alpine | gnutls | 3.24 | 3.8.13-r0 | fixed |
| Ubuntu | gnutls28 | pro | 3.8.3-1.1ubuntu3.1+Fips1 | vulnerable |
| Ubuntu | gnutls28 | pro | 3.8.3-1.1ubuntu3.4+Fips1 | vulnerable |
| Ubuntu | gnutls28 | pro | 3.8.3-1.1ubuntu3.4+Fips1.1 | vulnerable |
| Ubuntu | gnutls28 | pro | 3.8.3-1.1ubuntu3.5+Fips1.1 | vulnerable |
| Ubuntu | gnutls28 | pro | 3.8.3-1.1ubuntu3.6+Fips1.2 | fixed |
| Ubuntu | gnutls28 | 22.04 | 3.7.1-5ubuntu1 | vulnerable |
| Ubuntu | gnutls28 | 22.04 | 3.7.2-2ubuntu1 | vulnerable |
| Ubuntu | gnutls28 | 22.04 | 3.7.2-4ubuntu1 | vulnerable |
| Ubuntu | gnutls28 | 22.04 | 3.7.2-5ubuntu1 | vulnerable |
| Ubuntu | gnutls28 | 22.04 | 3.7.3-4ubuntu1 | vulnerable |
| Ubuntu | gnutls28 | 22.04 | 3.7.3-4ubuntu1.1 | vulnerable |
| Ubuntu | gnutls28 | 22.04 | 3.7.3-4ubuntu1.2 | vulnerable |
| Ubuntu | gnutls28 | 22.04 | 3.7.3-4ubuntu1.3 | vulnerable |
| Ubuntu | gnutls28 | 22.04 | 3.7.3-4ubuntu1.4 | vulnerable |
| Ubuntu | gnutls28 | 22.04 | 3.7.3-4ubuntu1.5 | vulnerable |
| Ubuntu | gnutls28 | 22.04 | 3.7.3-4ubuntu1.6 | vulnerable |
| Ubuntu | gnutls28 | 22.04 | 3.7.3-4ubuntu1.7 | vulnerable |
| Ubuntu | gnutls28 | 22.04 | 3.7.3-4ubuntu1.8 | vulnerable |
| Ubuntu | gnutls28 | 22.04 | 3.7.3-4ubuntu1.9 | fixed |
| Ubuntu | gnutls28 | 24.04 | 3.8.1-4ubuntu1 | vulnerable |
| Ubuntu | gnutls28 | 24.04 | 3.8.1-4ubuntu6 | vulnerable |
| Ubuntu | gnutls28 | 24.04 | 3.8.1-4ubuntu7 | vulnerable |
| Ubuntu | gnutls28 | 24.04 | 3.8.3-1ubuntu1 | vulnerable |
| Ubuntu | gnutls28 | 24.04 | 3.8.3-1.1ubuntu2 | vulnerable |
| Ubuntu | gnutls28 | 24.04 | 3.8.3-1.1ubuntu3 | vulnerable |
| Ubuntu | gnutls28 | 24.04 | 3.8.3-1.1ubuntu3.1 | vulnerable |
| Ubuntu | gnutls28 | 24.04 | 3.8.3-1.1ubuntu3.2 | vulnerable |
| Ubuntu | gnutls28 | 24.04 | 3.8.3-1.1ubuntu3.3 | vulnerable |
| Ubuntu | gnutls28 | 24.04 | 3.8.3-1.1ubuntu3.4 | vulnerable |
| Ubuntu | gnutls28 | 24.04 | 3.8.3-1.1ubuntu3.5 | vulnerable |
| Ubuntu | gnutls28 | 24.04 | 3.8.3-1.1ubuntu3.6 | fixed |
| Ubuntu | gnutls28 | 25.10 | 3.8.9-2ubuntu3 | vulnerable |
| Ubuntu | gnutls28 | 25.10 | 3.8.9-3ubuntu1 | vulnerable |
| Ubuntu | gnutls28 | 25.10 | 3.8.9-3ubuntu2 | vulnerable |
| Ubuntu | gnutls28 | 25.10 | 3.8.9-3ubuntu2.1 | vulnerable |
| Ubuntu | gnutls28 | 25.10 | 3.8.9-3ubuntu2.2 | fixed |
| Ubuntu | gnutls28 | 26.04 | 3.8.9-3ubuntu2 | vulnerable |
| Ubuntu | gnutls28 | 26.04 | 3.8.10-3ubuntu1 | vulnerable |
| Ubuntu | gnutls28 | 26.04 | 3.8.12-2ubuntu1 | vulnerable |
| Ubuntu | gnutls28 | 26.04 | 3.8.12-2ubuntu1.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | gnutls28 | source | sid | 3.8.13-1 | not yet assigned | Not reported | [1135319] |
| Debian | gnutls28 | source | forky | 3.8.13-1 | not yet assigned | Not reported | [1135319] |
| Debian | gnutls28 | source | trixie | 3.8.9-3+deb13u4 | not yet assigned | Not reported | [1135319] |
| Debian | gnutls28 | source | bookworm | 3.7.9-2+deb12u7 | not yet assigned | Not reported | [1135319] |
| Cpe | gnutls28 | cpe | Not reported | 3.8.3-1.1ubuntu3.6 | Not reported | Not reported | Not reported |
| Cpe | gnutls-bin | cpe | Not reported | 3.8.3-1.1ubuntu3.6 | Not reported | Not reported | Not reported |
| Cpe | gnutls-doc | cpe | Not reported | 3.8.3-1.1ubuntu3.6 | Not reported | Not reported | Not reported |
| Cpe | libgnutls-dane0t64 | cpe | Not reported | 3.8.3-1.1ubuntu3.6 | Not reported | Not reported | Not reported |
| Cpe | libgnutls-openssl27t64 | cpe | Not reported | 3.8.3-1.1ubuntu3.6 | Not reported | Not reported | Not reported |
| Cpe | libgnutls28-dev | cpe | Not reported | 3.8.3-1.1ubuntu3.6 | Not reported | Not reported | Not reported |
| Cpe | libgnutls30t64 | cpe | Not reported | 3.8.3-1.1ubuntu3.6 | Not reported | Not reported | Not reported |
| Alpine | gnutls | apk | 3.20 | 3.8.13-r0 | Not reported | ALPINE-CVE-2026-42012 | Not reported |
| Alpine | gnutls | apk | 3.21 | 3.8.13-r0 | Not reported | ALPINE-CVE-2026-42012 | Not reported |
| Alpine | gnutls | apk | 3.22 | 3.8.13-r0 | Not reported | ALPINE-CVE-2026-42012 | Not reported |
| Alpine | gnutls | apk | 3.23 | 3.8.13-r0 | Not reported | ALPINE-CVE-2026-42012 | Not reported |
| Alpine | gnutls | apk | 3.24 | 3.8.13-r0 | Not reported | ALPINE-CVE-2026-42012 | Not reported |
| Ubuntu | gnutls28 | deb | pro | 3.8.3-1.1ubuntu3.6+Fips1.2 | Not reported | UBUNTU-CVE-2026-42012 | Not reported |
| Ubuntu | gnutls28 | deb | 22.04 | 3.7.3-4ubuntu1.9 | Not reported | UBUNTU-CVE-2026-42012 | Not reported |
| Ubuntu | gnutls28 | deb | 24.04 | 3.8.3-1.1ubuntu3.6 | Not reported | UBUNTU-CVE-2026-42012 | Not reported |
| Ubuntu | gnutls28 | deb | 25.10 | 3.8.9-3ubuntu2.2 | Not reported | UBUNTU-CVE-2026-42012 | Not reported |
| Ubuntu | gnutls28 | deb | 26.04 | 3.8.12-2ubuntu1.1 | Not reported | UBUNTU-CVE-2026-42012 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [gnutls-bin]Fixed
Source package: [gnutls28]
Details (4)
3.7.9-2+deb12u7· amd64 · bookwormFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· arm64 · bookwormFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· amd64 · bookworm-securityFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· arm64 · bookworm-securityFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
- [gnutls-doc]Fixed
Source package: [gnutls28]
Details (4)
3.7.9-2+deb12u7· all · bookwormFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· all · bookwormFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· all · bookworm-securityFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· all · bookworm-securityFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
- [guile-gnutls]Fixed
Source package: [gnutls28]
Details (4)
3.7.9-2+deb12u7· amd64 · bookwormFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· arm64 · bookwormFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· amd64 · bookworm-securityFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· arm64 · bookworm-securityFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
- [libgnutls28-dev]Fixed
Source package: [gnutls28]
Details (4)
3.7.9-2+deb12u7· amd64 · bookwormFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· arm64 · bookwormFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· amd64 · bookworm-securityFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· arm64 · bookworm-securityFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
- [libgnutls30]Fixed
Source package: [gnutls28]
Details (4)
3.7.9-2+deb12u7· amd64 · bookwormFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· arm64 · bookwormFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· amd64 · bookworm-securityFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· arm64 · bookworm-securityFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
- [libgnutls-dane0]Fixed
Source package: [gnutls28]
Details (4)
3.7.9-2+deb12u7· amd64 · bookwormFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· arm64 · bookwormFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· amd64 · bookworm-securityFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· arm64 · bookworm-securityFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
- [libgnutls-openssl27]Fixed
Source package: [gnutls28]
Details (4)
3.7.9-2+deb12u7· amd64 · bookwormFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· arm64 · bookwormFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· amd64 · bookworm-securityFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· arm64 · bookworm-securityFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
- [libgnutlsxx30]Fixed
Source package: [gnutls28]
Details (4)
3.7.9-2+deb12u7· amd64 · bookwormFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· arm64 · bookwormFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· amd64 · bookworm-securityFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
3.7.9-2+deb12u7· arm64 · bookworm-securityFixed · Fixed:
3.7.9-2+deb12u7nvd · gnutls28 · debian · bookworm
Observed:
References
- [https://ftp.suse.com/pub/projects/security/]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-42012]
- [https://osv.dev/vulnerability/ALPINE-CVE-2026-42012]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-42012]
- [https://security-tracker.debian.org/tracker/CVE-2026-42012]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42012.json]
- [https://ubuntu.com/security/notices/USN-8284-1]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-3043.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)]