CVE-2026-121626
GNU Gatekeeper before 5.16 Out-of-Bounds Read in H.460.24 RTCP Probe Handler
CVSS Score
3.7
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-125 |
| Vendor | willamowius |
| Product | gnugk |
| Published | Nov 3, 2026 |
Stay Ahead of the Next One
Get instant alerts for willamowius gnugk
Be the first to know when new low vulnerabilities affecting willamowius gnugk are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
Affected Versions
willamowius / gnugk
0 < 5.16
References
github.com: https://github.com/willamowius/gnugk/commit/160aa27344ecc9a443cccaa63e8d7fa95a766610 github.com: https://github.com/willamowius/gnugk/releases/tag/v5_16 github.com: https://github.com/willamowius/gnugk/blob/v5_15/GkClient.cxx#L963-L990 github.com: https://github.com/willamowius/gnugk vulncheck.com: https://www.vulncheck.com/advisories/gnu-gatekeeper-before-5.16-out-of-bounds-read-in-h-460.24-rtcp-probe-handler
Credits
Tristan Madani (Talence Security) Jan Willamowius