{"id":"UBUNTU-CVE-2026-27940","details":"llama.cpp is an inference of several LLM models in C/C++. Prior to b8146, the gguf_init_from_file_impl() in gguf.cpp is vulnerable to an Integer overflow, leading to an undersized heap allocation. Using the subsequent fread() writes 528+ bytes of attacker-controlled data past the buffer boundary. This is a bypass of a similar bug in the same file - CVE-2025-53630, but the fix overlooked some areas. This vulnerability is fixed in b8146.","modified":"2026-05-20T16:24:52.607779949Z","published":"2026-03-12T17:16:00Z","upstream":["CVE-2026-27940"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-27940"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-27940"}],"affected":[{"package":{"name":"llama.cpp","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/llama.cpp?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5318+dfsg-1","5318+dfsg-2","5713+dfsg-1","5760+dfsg-1","5760+dfsg-3","5760+dfsg-4","5882+dfsg-2"],"ecosystem_specific":{"binaries":[{"binary_name":"llama.cpp","binary_version":"5882+dfsg-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27940.json"}},{"package":{"name":"llama.cpp","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/llama.cpp?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5882+dfsg-2","8064+dfsg-1ubuntu1","8681+dfsg-1"],"ecosystem_specific":{"binaries":[{"binary_version":"8681+dfsg-1","binary_name":"libllama0"},{"binary_name":"llama.cpp","binary_version":"8681+dfsg-1"},{"binary_name":"llama.cpp-examples","binary_version":"8681+dfsg-1"},{"binary_version":"8681+dfsg-1","binary_name":"llama.cpp-tests"},{"binary_name":"llama.cpp-tools","binary_version":"8681+dfsg-1"},{"binary_name":"llama.cpp-tools-extra","binary_version":"8681+dfsg-1"},{"binary_version":"8681+dfsg-1","binary_name":"python3-gguf"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27940.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}