{"id":"CVE-2026-107183","published":"2026-10-07T14:17:09.003","lastModified":"2026-10-07T15:57:20.793","description":"llama.cpp before b11393 contains a use-after-free and double free vulnerability in common_chat_peg_mapper::map that allows unauthenticated remote attackers to corrupt heap memory via a dangling current_tool pointer. Attackers can submit a chat_parser in a POST /completion request emitting a tool-id after a tool-close tag to crash llama-server and shape a heap write primitive.","cvssScore":8.1,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","cwes":["CWE-416"],"vendors":[],"products":[],"references":[{"url":"https://github.com/ggml-org/llama.cpp","tags":[]},{"url":"https://github.com/ggml-org/llama.cpp/blob/bed0a856606ee4a24a164066f73d2379447033f5/common/chat-peg-parser.cpp#L343-L355","tags":[]},{"url":"https://github.com/ggml-org/llama.cpp/blob/bed0a856606ee4a24a164066f73d2379447033f5/tools/server/server-schema.cpp#L321-L324","tags":[]},{"url":"https://github.com/ggml-org/llama.cpp/commit/dbe4c3ed42343f0a7ba0fd7e808ffeaca404d29f","tags":[]},{"url":"https://github.com/ggml-org/llama.cpp/pull/29942","tags":[]},{"url":"https://www.vulncheck.com/advisories/llama-cpp-before-b11393-use-after-free-via-common-chat-peg-mapper-chat-parser","tags":[]}],"exploitRefs":[{"url":"https://github.com/ggml-org/llama.cpp","tags":[]},{"url":"https://github.com/ggml-org/llama.cpp/blob/bed0a856606ee4a24a164066f73d2379447033f5/common/chat-peg-parser.cpp#L343-L355","tags":[]},{"url":"https://github.com/ggml-org/llama.cpp/blob/bed0a856606ee4a24a164066f73d2379447033f5/tools/server/server-schema.cpp#L321-L324","tags":[]},{"url":"https://github.com/ggml-org/llama.cpp/commit/dbe4c3ed42343f0a7ba0fd7e808ffeaca404d29f","tags":[]},{"url":"https://github.com/ggml-org/llama.cpp/pull/29942","tags":[]}],"hasPoc":true,"ai":{"summary":"The vulnerability is a use-after-free and double free in llama.cpp's chat parser that allows remote attackers to corrupt heap memory by submitting crafted tool-id tags after tool-close tags, potentially leading to arbitrary code execution or denial of service.","exploitability":"Exploitation requires sending a specially crafted POST /completion request with a chat_parser containing a tool-id after a tool-close tag, making it moderately difficult but possible for unauthenticated attackers to trigger heap corruption.","blast_radius":"If exploited, this vulnerability could affect any system running llama-server with the affected version of llama.cpp, potentially allowing remote code execution or complete service denial across all chat-based applications using this library.","remediation":"Upgrade to llama.cpp version b11393 or later to fix the use-after-free and double free vulnerability in common_chat_peg_mapper::map.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["rce","memory-corruption","llm"],"model":"garnet-coder","analyzedAt":"2026-10-15T08:58:41.354Z"}}