Vulnerability · Published Nov 3, 2026 · Assigned by VulnCheck
CVE-2026-121625GNU Gatekeeper before 5.16 Out-of-Bounds Read via RTCP SDES Parsing
Low 3.7
In plain English
A low-severity out-of-bounds read in gnugk from willamowius. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities).
Severity (CVSS 3.1)3.7Low
Exploit odds (30 days)0.4%top 69.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
GNU Gatekeeper (gnugk) before 5.16 contains an out-of-bounds read vulnerability in ParseRTCP() in ProxyChannel.cxx that allows remote RTP peers to read heap memory past received packets. Attackers can send RTCP SDES items lacking a NUL byte to the media proxy port during proxied H.323 calls with EnableRTCPStats enabled, crashing the gatekeeper.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| willamowius | gnugk | 0 – before 5.16 |
Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
References
- Patch Commit patch
- gnugk v5_16 Release Notes release-notes
- https://github.com/willamowius/gnugk/blob/v5_15/ProxyChannel.cxx#L14867-L14895 technical-description
- https://github.com/willamowius/gnugk product
- VulnCheck Advisory: GNU Gatekeeper before 5.16 Out-of-Bounds Read via RTCP SDES Parsing third-party-advisory