{"id":"UBUNTU-CVE-2026-121626","details":"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.","modified":"2026-11-05T11:46:32.797426771Z","published":"2026-11-03T18:17:00Z","upstream":["CVE-2026-121626"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-121626"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-121626"},{"type":"REPORT","url":"https://github.com/willamowius/gnugk"},{"type":"REPORT","url":"https://github.com/willamowius/gnugk/blob/v5_15/GkClient.cxx#L963-L990"},{"type":"REPORT","url":"https://github.com/willamowius/gnugk/commit/160aa27344ecc9a443cccaa63e8d7fa95a766610"},{"type":"REPORT","url":"https://github.com/willamowius/gnugk/releases/tag/v5_16"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/gnu-gatekeeper-before-5.16-out-of-bounds-read-in-h-460.24-rtcp-probe-handler"}],"affected":[{"package":{"name":"gnugk","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/gnugk?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:3.6-1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"gnugk","binary_version":"2:3.6-1build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121626.json"}},{"package":{"name":"gnugk","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/gnugk?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:3.6-1build2"],"ecosystem_specific":{"binaries":[{"binary_version":"2:3.6-1build2","binary_name":"gnugk"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121626.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}