CVE-2026-21869

{"id": "CVE-2026-21869", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-21869", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-01-08T19:15:25.248439Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.8}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "ggml-org", "product": "llama.cpp", "versions": [{"status": "affected", "version": "<= 55d4206c8"}]}]}], "published": "2026-01-08T00:16:00.297", "references": [{"url": "https://github.com/ggml-org/llama.cpp/security/advisories/GHSA-8947-pfff-2f3c", "tags": ["Exploit", "Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/ggml-org/llama.cpp/security/advisories/GHSA-8947-pfff-2f3c", "tags": ["Exploit", "Vendor Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-787"}]}], "descriptions": [{"lang": "en", "value": "llama.cpp is an inference of several LLM models in C/C++. In commits 55d4206c8 and prior, the n_discard parameter is parsed directly from JSON input in the llama.cpp server's completion endpoints without validation to ensure it's non-negative. When a negative value is supplied and the context fills up, llama_memory_seq_rm/add receives a reversed range and negative offset, causing out-of-bounds memory writes in the token evaluation loop. This deterministic memory corruption can crash the process or enable remote code execution (RCE). There is no fix at the time of publication."}, {"lang": "es", "value": "llama.cpp es una inferencia de varios modelos LLM en C/C++. En los commits 55d4206c8 y anteriores, el par\u00e1metro n_discard se analiza directamente de la entrada JSON en los puntos finales de completado del servidor de llama.cpp sin validaci\u00f3n para asegurar que no sea negativo. Cuando se suministra un valor negativo y el contexto se llena, llama_memory_seq_rm/add recibe un rango invertido y un desplazamiento negativo, causando escrituras de memoria fuera de l\u00edmites en el bucle de evaluaci\u00f3n de tokens. Esta corrupci\u00f3n de memoria determinista puede bloquear el proceso o permitir la ejecuci\u00f3n remota de c\u00f3digo (RCE). No hay una soluci\u00f3n en el momento de la publicaci\u00f3n."}], "lastModified": "2026-06-17T10:19:03.657", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:ggml:llama.cpp:-:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0A466917-A76C-4F63-B744-EC07FFB90CAF"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}