CVE-2026-88647
Publication date 8 October 2026
Last updated 4 November 2026
Ubuntu priority
Description
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| gnutls26 | 26.10 stonking | Not in release |
| 26.04 LTS resolute | Not in release | |
| 24.04 LTS noble | Not in release | |
| 22.04 LTS jammy | Not in release | |
| 14.04 LTS trusty |
Vulnerable, fix deferred
|
|
| gnutls28 | 26.10 stonking |
Vulnerable, fix deferred
|
| 26.04 LTS resolute |
Vulnerable, fix deferred
|
|
| 24.04 LTS noble |
Vulnerable, fix deferred
|
|
| 22.04 LTS jammy |
Vulnerable, fix deferred
|
|
| 20.04 LTS focal |
Vulnerable, fix deferred
|
|
| 18.04 LTS bionic |
Vulnerable, fix deferred
|
|
| 16.04 LTS xenial |
Vulnerable, fix deferred
|
Notes
mdeslaur
gnutls developers do not consider this issue to be valid per their security policy. As of 2026-10-15, there is no fix for this issue from gnutls developers. Marking as deferred for now.
Severity score breakdown
CVSS version: CVSS v3.0
Base score
6.5 · Medium
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N