Out-of-bounds Read in Willamowius Gnugk
CVE-2026-121626
GNU Gatekeeper (gnugk) before 5.16 contains an out-of-bounds read vulnerability in H46024Socket::ReceivedProbePacket() that allows remote attackers to cause a heap over-read by sending short probe packets. Attackers can send a short application-defined RTCP packet to the media port during H.460.24 probing to read past the heap allocation and possibly crash the gatekeeper.
Vulnerability class: Buffer Overflow
Published .
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/willamowius/gnugk/commit/160aa27344ecc9a443cccaa63e8d7fa95a766610 (patch)
- github.com/willamowius/gnugk/releases/tag/v5_16 (release-notes)
- github.com/willamowius/gnugk/blob/v5_15/GkClient.cxx (technical-description)
- github.com/willamowius/gnugk (product)
- www.vulncheck.com/advisories/gnu-gatekeeper-before-5.16-out-of-bounds-read-in-h… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-121626?
- CVE-2026-121626 is a low-severity vulnerability in Willamowius Gnugk, classified under Out-of-bounds Read. CVSS score: 3.7/10. Published 2026-11-03.
- How severe is CVE-2026-121626?
- Low severity. CVSS v3 base score is 3.7 out of 10.