{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-116816","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","state":"PUBLISHED","assignerShortName":"VulnCheck","dateReserved":"2026-10-26T22:13:56.315Z","datePublished":"2026-10-27T00:33:58.581Z","dateUpdated":"2026-10-27T00:33:58.581Z"},"containers":{"cna":{"providerMetadata":{"orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","shortName":"VulnCheck","dateUpdated":"2026-10-27T00:33:58.581Z"},"datePublic":"2026-07-21T00:00:00.000Z","title":"llama.cpp b5899 before b10261 Heap Out-of-Bounds Write via plamo2 Tokenizer","descriptions":[{"lang":"en","value":"llama.cpp b5899 before b10261 contains a heap out-of-bounds write vulnerability in llm_tokenizer_plamo2::build that allows attackers to corrupt heap memory via crafted GGUF models. Attackers can supply BYTE-typed token text like <0x-1> whose negative parsed value writes token ids before the bytes_ buffer during model loading, causing crashes or potential code execution."}],"problemTypes":[{"descriptions":[{"lang":"en","description":"Improper Validation of Array Index","cweId":"CWE-129","type":"CWE"}]}],"affected":[{"vendor":"ggml-org","product":"llama.cpp","defaultStatus":"unaffected","packageURL":"pkg:github/ggml-org/llama.cpp","versions":[{"version":"b5899","status":"affected","versionType":"custom","lessThan":"b10261"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:ggml:llama.cpp:*:*:*:*:*:*:*:*","versionStartIncluding":"b5899","versionEndExcluding":"b10261"}]}]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","attackVector":"LOCAL","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.5,"baseSeverity":"HIGH"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseScore":7.8,"baseSeverity":"HIGH"}}],"references":[{"url":"https://github.com/ggml-org/llama.cpp/pull/25969","tags":["issue-tracking","patch"]},{"url":"https://github.com/ggml-org/llama.cpp/pull/26511","tags":["patch","issue-tracking"]},{"url":"https://github.com/ggml-org/llama.cpp/commit/cf06ad7dfe79e7bf2934150d4fefe1ce8db05490","tags":["patch"]},{"url":"https://github.com/ggml-org/llama.cpp/blob/b10259/src/llama-vocab.cpp#L1376-L1377","tags":["technical-description"]},{"url":"https://github.com/ggml-org/llama.cpp/releases/tag/b10261","tags":["release-notes"],"name":"llama.cpp b10261 Release Notes"},{"name":"VulnCheck Advisory: llama.cpp b5899 before b10261 Heap Out-of-Bounds Write via plamo2 Tokenizer","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/llama-cpp-b5899-before-b10261-heap-out-of-bounds-write-via-plamo2-tokenizer"}],"credits":[{"lang":"en","value":"Pedro Cruz (g4nkd)","type":"finder"},{"lang":"en","value":"Jeongwoo Lee","type":"reporter"},{"lang":"en","value":"CISC","type":"remediation developer"}],"x_generator":{"engine":"vulncheck-endgame"}}}}