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CVE-2026-95210

Improper certificate validation in gnutls v3.8.13 causes the application to accept certificates...

4.8 MediumFix availableDisputed

GnuTLS v3.8.13 does not reject a critical keyUsage extension when it cannot be processed, such as when extnValue is an ASN.1 NULL (05 00) instead of a BIT STRING. NOTE: the Supplier does not consider this an actionable security vulnerability because of its "threat model doesn't consider attacks only possible by modifying anything within the trust boundary (private keys, trusted certificate authorities and their issued certificates including intermediate CAs, etc.)" policy.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
None

Exploit likelihood

0.20%Unchanged since Oct 9, 2026
90%50%10%1%

What each source reports

CVE List Score used 4.8

GnuTLS v3.8.13 does not reject a critical keyUsage extension when it cannot be processed, such as when extnValue is an ASN.1 NULL (05 00) instead of a BIT STRING. NOTE: the Supplier does not consider this an actionable security vulnerability because of its "threat model doesn't consider attacks only possible by modifying anything within the trust boundary (private keys, trusted certificate authorities and their issued certificates including intermediate CAs, etc.)" policy.

Record
CVE-2026-95210
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-295
Updated
2026-11-04
EUVDEUVD-2026-95139 4.8

GnuTLS v3.8.13 does not reject a critical keyUsage extension when it cannot be processed, such as when extnValue is an ASN.1 NULL (05 00) instead of a BIT STRING. NOTE: the Supplier does not consider this an actionable security vulnerability because of its "threat model doesn't consider attacks only possible by modifying anything within the trust boundary (private keys, trusted certificate authorities and their issued certificates including intermediate CAs, etc.)" policy.

Record
EUVD-2026-95139
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Updated
2026-11-04
GitHub AdvisoriesGHSA-9mfx-g534-q3pc 9.1

Improper certificate validation in gnutls v3.8.13 causes the application to accept certificates...

Improper certificate validation in gnutls v3.8.13 causes the application to accept certificates containing invalid extensions.

Record
GHSA-9mfx-g534-q3pc
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-295
Updated
2026-11-04
NVD 4.8

GnuTLS v3.8.13 does not reject a critical keyUsage extension when it cannot be processed, such as when extnValue is an ASN.1 NULL (05 00) instead of a BIT STRING. NOTE: the Supplier does not consider this an actionable security vulnerability because of its "threat model doesn't consider attacks only possible by modifying anything within the trust boundary (private keys, trusted certificate authorities and their issued certificates including intermediate CAs, etc.)" policy.

Record
CVE-2026-95210
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-295
Updated
2026-11-04
OSVBELL-CVE-2026-95210 4.8
Record
BELL-CVE-2026-95210
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Updated
2026-11-02
OSVDEBIAN-CVE-2026-95210 4.8

GnuTLS v3.8.13 does not reject a critical keyUsage extension when it cannot be processed, such as when extnValue is an ASN.1 NULL (05 00) instead of a BIT STRING. NOTE: the Supplier does not consider this an actionable security vulnerability because of its "threat model doesn't consider attacks only possible by modifying anything within the trust boundary (private keys, trusted certificate authorities and their issued certificates including intermediate CAs, etc.)" policy.

Record
DEBIAN-CVE-2026-95210
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Updated
2026-11-05
Show 4 moreShow less
OSVUBUNTU-CVE-2026-95210 4.8

GnuTLS v3.8.13 does not reject a critical keyUsage extension when it cannot be processed, such as when extnValue is an ASN.1 NULL (05 00) instead of a BIT STRING. NOTE: the Supplier does not consider this an actionable security vulnerability because of its "threat model doesn't consider attacks only possible by modifying anything within the trust boundary (private keys, trusted certificate authorities and their issued certificates including intermediate CAs, etc.)" policy.

Record
UBUNTU-CVE-2026-95210
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Updated
2026-11-05
OSVAZL-107442 No score

CVE-2026-95210 affecting package gnutls 3.8.13-1

GnuTLS v3.8.13 does not reject a critical keyUsage extension when it cannot be processed, such as when extnValue is an ASN.1 NULL (05 00) instead of a BIT STRING. NOTE: the Supplier does not consider this an actionable security vulnerability because of its "threat model doesn't consider attacks only possible by modifying anything within the trust boundary (private keys, trusted certificate authorities and their issued certificates including intermediate CAs, etc.)" policy.

Record
AZL-107442
Updated
2026-11-05
OSVROOT-OS-DEBIAN-12-CVE-2026-95210 No score

CVE-2026-95210 in gnutls28 - Patched by Root

Root has patched CVE-2026-95210 in the gnutls28 package for Root:Debian:12. Multiple fixed versions available.

Record
ROOT-OS-DEBIAN-12-CVE-2026-95210
Updated
2026-11-02
OSVROOT-OS-DEBIAN-13-CVE-2026-95210 No score

CVE-2026-95210 in gnutls28 - Patched by Root

Root has patched CVE-2026-95210 in the gnutls28 package for Root:Debian:13. Multiple fixed versions available.

Record
ROOT-OS-DEBIAN-13-CVE-2026-95210
Updated
2026-11-02

Affected packages

Affected packages
PackageAffectedFixed
gnutls
Azure Linux:3
 through 3.8.13-1 None known
gnutls
Alpaquita:23
 3.7.8-r2 and later None known
gnutls
Alpaquita:25
 3.8.8-r0 and later None known
gnutls
Alpaquita:stream
 3.8.0-r3 and later None known
gnutls28
Debian:12
 All versions, plus listed versions
3.7.9-23.7.9-2+deb12u13.7.9-2+deb12u23.7.9-2+deb12u33.7.9-2+deb12u4
Show 40 moreShow less
3.7.9-2+deb12u53.7.9-2+deb12u63.7.9-2+deb12u73.7.9-2+loong643.8.0+git20230413-13.8.0+git20230529-13.8.0+git20230713-13.8.1-13.8.1-23.8.1-33.8.1-43.8.10-13.8.10-23.8.10-33.8.11-13.8.11-23.8.11-33.8.12-13.8.12-23.8.12-33.8.12-43.8.13-13.8.2-13.8.3-13.8.3-1.13.8.3-1.1~exp13.8.4-13.8.4-23.8.5-13.8.5-23.8.5-33.8.5-43.8.6-13.8.6-23.8.7.1-13.8.8-13.8.8-23.8.9-13.8.9-23.8.9-3
 None known
gnutls28
Debian:13
 All versions, plus listed versions
3.8.10-13.8.10-23.8.10-33.8.11-13.8.11-2
Show 11 moreShow less
3.8.11-33.8.12-13.8.12-23.8.12-33.8.12-43.8.13-13.8.9-33.8.9-3+deb13u13.8.9-3+deb13u23.8.9-3+deb13u33.8.9-3+deb13u4
 None known
gnutls28
Debian:14
 All versions, plus listed versions
3.8.10-13.8.10-23.8.10-33.8.11-13.8.11-2
Show 7 moreShow less
3.8.11-33.8.12-13.8.12-23.8.12-33.8.12-43.8.13-13.8.9-3
 None known
gnutls28
Root:Debian:12
 before 3.7.9-2+deb12u7.aikido.5
3.7.9-2+deb12u7.aikido.5
rootio-gnutls28
Root:Debian:12
 before 3.7.9-2+deb12u7.aikido.5
3.7.9-2+deb12u7.aikido.5
gnutls28
Root:Debian:13
 before 3.8.9-3+deb13u4.aikido.3
3.8.9-3+deb13u4.aikido.3
Show 12 moreShow less
Affected packages
PackageAffectedFixed
rootio-gnutls28
Root:Debian:13
 before 3.8.9-3+deb13u4.aikido.3
3.8.9-3+deb13u4.aikido.3
gnutls26
Ubuntu:Pro:14.04:LTS
 All versions, plus listed versions
2.12.23-1ubuntu42.12.23-1ubuntu52.12.23-12ubuntu12.12.23-12ubuntu22.12.23-12ubuntu2.1
Show 8 moreShow less
2.12.23-12ubuntu2.22.12.23-12ubuntu2.32.12.23-12ubuntu2.42.12.23-12ubuntu2.52.12.23-12ubuntu2.62.12.23-12ubuntu2.72.12.23-12ubuntu2.82.12.23-12ubuntu2.10+esm1
 None known
gnutls28
Ubuntu:Pro:16.04:LTS
 All versions, plus listed versions
3.3.15-5ubuntu23.3.18-1ubuntu13.3.20-1ubuntu13.4.9-2ubuntu13.4.10-4ubuntu1
Show 13 moreShow less
3.4.10-4ubuntu1.13.4.10-4ubuntu1.23.4.10-4ubuntu1.33.4.10-4ubuntu1.43.4.10-4ubuntu1.53.4.10-4ubuntu1.63.4.10-4ubuntu1.73.4.10-4ubuntu1.83.4.10-4ubuntu1.93.4.10-4ubuntu1.9+esm13.4.10-4ubuntu1.9+esm23.4.10-4ubuntu1.9+esm33.4.10-4ubuntu1.9+esm4
 None known
gnutls28
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
3.5.8-6ubuntu33.5.17-1ubuntu13.5.17-1ubuntu33.5.18-1ubuntu13.5.18-1ubuntu1.1
Show 9 moreShow less
3.5.18-1ubuntu1.23.5.18-1ubuntu1.33.5.18-1ubuntu1.43.5.18-1ubuntu1.53.5.18-1ubuntu1.63.5.18-1ubuntu1.6+esm13.5.18-1ubuntu1.6+esm23.5.18-1ubuntu1.6+esm33.5.18-1ubuntu1.6+esm4
 None known
gnutls28
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
3.6.9-5ubuntu13.6.9-5ubuntu23.6.10-53.6.11.1-23.6.11.1-2ubuntu2
Show 14 moreShow less
3.6.13-2ubuntu13.6.13-2ubuntu1.13.6.13-2ubuntu1.23.6.13-2ubuntu1.33.6.13-2ubuntu1.63.6.13-2ubuntu1.73.6.13-2ubuntu1.83.6.13-2ubuntu1.93.6.13-2ubuntu1.103.6.13-2ubuntu1.113.6.13-2ubuntu1.123.6.13-2ubuntu1.12+esm13.6.13-2ubuntu1.12+esm23.6.13-2ubuntu1.12+esm3
 None known
gnutls28
Ubuntu:22.04:LTS
 All versions, plus listed versions
3.7.1-5ubuntu13.7.2-2ubuntu13.7.2-4ubuntu13.7.2-5ubuntu13.7.3-4ubuntu1
Show 9 moreShow less
3.7.3-4ubuntu1.13.7.3-4ubuntu1.23.7.3-4ubuntu1.33.7.3-4ubuntu1.43.7.3-4ubuntu1.53.7.3-4ubuntu1.63.7.3-4ubuntu1.73.7.3-4ubuntu1.83.7.3-4ubuntu1.9
 None known
gnutls28
Ubuntu:Pro:FIPS-preview:22.04:LTS
 All versions, plus listed versions
3.7.3-4ubuntu1.2+Fips1.1
 None known
gnutls28
Ubuntu:Pro:FIPS-updates:22.04:LTS
 All versions, plus listed versions
3.7.3-4ubuntu1.2+Fips1.13.7.3-4ubuntu1.3+Fips1.13.7.3-4ubuntu1.4+Fips13.7.3-4ubuntu1.5+Fips13.7.3-4ubuntu1.6+Fips1
Show 4 moreShow less
3.7.3-4ubuntu1.7+Fips13.7.3-4ubuntu1.7+Fips1.13.7.3-4ubuntu1.8+Fips1.13.7.3-4ubuntu1.9+Fips1
 None known
gnutls28
Ubuntu:24.04:LTS
 All versions, plus listed versions
3.8.1-4ubuntu13.8.1-4ubuntu63.8.1-4ubuntu73.8.3-1ubuntu13.8.3-1.1ubuntu2
Show 7 moreShow less
3.8.3-1.1ubuntu33.8.3-1.1ubuntu3.13.8.3-1.1ubuntu3.23.8.3-1.1ubuntu3.33.8.3-1.1ubuntu3.43.8.3-1.1ubuntu3.53.8.3-1.1ubuntu3.6
 None known
gnutls28
Ubuntu:Pro:FIPS-updates:24.04:LTS
 All versions, plus listed versions
3.8.3-1.1ubuntu3.1+Fips13.8.3-1.1ubuntu3.4+Fips13.8.3-1.1ubuntu3.4+Fips1.13.8.3-1.1ubuntu3.5+Fips1.13.8.3-1.1ubuntu3.6+Fips1.2
 None known
gnutls28
Ubuntu:26.10
 All versions, plus listed versions
3.8.12-2ubuntu13.8.12-2ubuntu1.13.8.13-1ubuntu1
 None known
gnutls28
Ubuntu:26.04:LTS
 All versions, plus listed versions
3.8.9-3ubuntu23.8.10-3ubuntu13.8.12-2ubuntu13.8.12-2ubuntu1.1
 None known

History

History
RecordedChangedSources
description, facts, references, statusCVE List
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-95210 is a medium vulnerability (CVSS 4.8) in gnutls, published October 8, 2026. Its validity is disputed. EPSS puts the chance of exploitation in the next 30 days at 0.20%, the 9th percentile. Fixed in gnutls28 3.7.9-2+deb12u7.aikido.5.

References

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