CVE-2026-88647
CVE-2026-88647
GnuTLS v3.8.13 can perhaps unexpectedly trust a certificate on the basis of Common Name when Subject Alternative Name has an SRV otherName (1.3.6.1.5.5.7.8.7) whose value is an OCTET 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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| n/a n/a |
Version not specified (affected) | CNA: mitre |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 6.5 medium |
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N | ADP: CISA-ADP |
| 3.1 / 6.5 medium |
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N | NVD: 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://gitlab.com/gnutls/gnutls/-/issues/1802CNA: mitre
- https://gist.github.com/lkloliver/f98ec3de1a871fdfc02b70b8b9ba7642CNA: mitre
- https://gitlab.com/gnutls/gnutls/-/work_items/1965CNA: mitre
- https://gitlab.com/gnutls/gnutls/-/blob/e2169a87c7fb91935c2845088204b102baed4c5f/SECURITY.mdCNA: mitre
- https://github.com/lkloliver/poc/tree/main/CVE-2026-88647ADP: CVE
- https://gist.github.com/lkloliver/f98ec3de1a871fdfc02b70b8b9ba7642[email protected]
- https://gitlab.com/gnutls/gnutls/-/blob/e2169a87c7fb91935c2845088204b102baed4c5f/SECURITY.md[email protected]
- https://gitlab.com/gnutls/gnutls/-/issues/1802[email protected]
- https://gitlab.com/gnutls/gnutls/-/work_items/1965[email protected]
- https://github.com/lkloliver/poc/tree/main/CVE-2026-88647af854a3a-2127-422b-91ae-364da2661108
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