Is CVE-2026-121626 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-121626?

CVE-2026-121626 has a CVSS v3 severity of LOW (3.7).

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CVE-2026-121626

Description

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.