CVE-2026-88647CWE-297

CVE-2026-88647

Medium · published October 8, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
4.8
In the wild
Unconfirmed
What it is

A hostname verification bypass in GnuTLS v3.8.13 allows attackers to circumvent the Common Name fallback mechanism and eavesdrop on communications via a crafted certificate.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00160 · 4.8th percentile
Weakness
CWE-297 · Improper Validation of Certificate with Host Mismatch
Published
2026-10-08T21:17Z
References (2)
https://gist.github.com/lkloliver/f98ec3de1a871fdfc02b70b8b9ba7642 · [email protected]https://gitlab.com/gnutls/gnutls/-/issues/1802 · [email protected]
EPSS history
Timeline
  • 10 OCT 03:32Z
    EPSS moved — → 0%
    epss
  • 08 OCT 00:00Z
    A hostname verification bypass in GnuTLS v3.8.13 allows attackers to circumvent the Common Name fallback mechanism and eavesdrop on communications via a…
    cvelistv5
  • 08 OCT 00:00Z
    A hostname verification bypass in GnuTLS v3.8.13 allows attackers to circumvent the Common Name fallback mechanism and eavesdrop on communications via a…
    cvelistv5