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CVE-2026-67693

An issue in gnutls v.3.8.13 allows an attacker to obtain sensitive information via failing to...

3.7 LowFix availableDisputed

GnuTLS v3.8.13 does not reject end-entity X.509 certificates that contain a contradictory combination of Key Usage (KU) and Extended Key Usage (EKU). 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
None
Availability
None

Exploit likelihood

0.17%Up 0.1 points since Oct 9, 2026
90%50%10%1%

What each source reports

CVE List Score used 3.7

GnuTLS v3.8.13 does not reject end-entity X.509 certificates that contain a contradictory combination of Key Usage (KU) and Extended Key Usage (EKU). 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-2026-67693
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness
CWE-367
Updated
2026-11-04
EUVDEUVD-2026-95206 3.7

GnuTLS v3.8.13 does not reject end-entity X.509 certificates that contain a contradictory combination of Key Usage (KU) and Extended Key Usage (EKU). 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-2026-95206
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated
2026-11-04
GitHub AdvisoriesGHSA-j75v-5pm7-3cg8 7.5

An issue in gnutls v.3.8.13 allows an attacker to obtain sensitive information via failing to...

An issue in gnutls v.3.8.13 allows an attacker to obtain sensitive information via failing to reject end-entity X.509 certificates that contain a contradictory combination of Key Usage (KU) and Extended Key Usage (EKU)

Record
GHSA-j75v-5pm7-3cg8
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-367
Updated
2026-11-04
NVD 3.7

GnuTLS v3.8.13 does not reject end-entity X.509 certificates that contain a contradictory combination of Key Usage (KU) and Extended Key Usage (EKU). 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-2026-67693
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness
CWE-367
Updated
2026-11-04
OSVBELL-CVE-2026-67693 3.7

CVE-2026-67693 does not affect BellSoft software

Record
BELL-CVE-2026-67693
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated
2026-11-02
OSVDEBIAN-CVE-2026-67693 3.7

GnuTLS v3.8.13 does not reject end-entity X.509 certificates that contain a contradictory combination of Key Usage (KU) and Extended Key Usage (EKU). 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-2026-67693
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated
2026-11-05
Show 4 moreShow less
OSVUBUNTU-CVE-2026-67693 3.7

GnuTLS v3.8.13 does not reject end-entity X.509 certificates that contain a contradictory combination of Key Usage (KU) and Extended Key Usage (EKU). 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-2026-67693
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated
2026-11-05
OSVAZL-107448 No score

CVE-2026-67693 affecting package gnutls 3.8.13-1

GnuTLS v3.8.13 does not reject end-entity X.509 certificates that contain a contradictory combination of Key Usage (KU) and Extended Key Usage (EKU). 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-107448
Updated
2026-11-05
OSVROOT-OS-DEBIAN-12-CVE-2026-67693 No score

CVE-2026-67693 in gnutls28 - Patched by Root

Root has patched CVE-2026-67693 in the gnutls28 package for Root:Debian:12. Multiple fixed versions available.

Record
ROOT-OS-DEBIAN-12-CVE-2026-67693
Updated
2026-11-02
OSVROOT-OS-DEBIAN-13-CVE-2026-67693 No score

CVE-2026-67693 in gnutls28 - Patched by Root

Root has patched CVE-2026-67693 in the gnutls28 package for Root:Debian:13. Multiple fixed versions available.

Record
ROOT-OS-DEBIAN-13-CVE-2026-67693
Updated
2026-11-02

Affected packages

Affected packages
PackageAffectedFixed
gnutls
Azure Linux:3
 through 3.8.13-1 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
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
Show 9 moreShow less
Affected packages
PackageAffectedFixed
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
referencesEUVD
description, referencesCVE List
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-2026-67693 is a low vulnerability (CVSS 3.7) in gnutls, published October 8, 2026. Its validity is disputed. EPSS puts the chance of exploitation in the next 30 days at 0.17%, the 5th percentile. Fixed in gnutls28 3.7.9-2+deb12u7.aikido.5.

References

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