{"id":"CVE-2026-109311","title":"vLLM before 0.29.0 passes uploaded audio to the PyAV/FFmpeg av.open() fallback with only a file-size check, exposing FFmpeg's IAMF parser heap overflow","summary":"vLLM before 0.29.0 passes uploaded audio to the PyAV/FFmpeg av.open() fallback with only a file-size check, exposing FFmpeg's IAMF parser heap overflow. Authenticated remote attackers can repeatedly upload malformed IAMF containers to /v…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-20","CWE-787"],"published":"2026-10-12","updated":"2026-10-12","sourceUpdated":"2026-10-12T17:17:25.730","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-109311","references":[{"url":"https://github.com/vllm-project/vllm/security/advisories/GHSA-m52c-39rh-f3gp","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/vllm-before-0.29.0-heap-overflow-dos-via-iamf-audio-transcription-upload","label":"disclosure@vulncheck.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-109311.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-109311"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2549768"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-109311"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-109311"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat"],"ingestedAt":"2026-10-12T18:00:08.198Z","vendor":"vllm-project","product":"vllm","affected":["vllm < 0.29.0"],"epss":0.00479,"epssPercentile":0.41156,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-18T11:51:46.666911Z"},"slug":"CVE-2026-109311","body":"## Overview\n\nvLLM before 0.29.0 passes uploaded audio to the PyAV/FFmpeg av.open() fallback with only a file-size check, exposing FFmpeg's IAMF parser heap overflow. Authenticated remote attackers can repeatedly upload malformed IAMF containers to /v1/audio/transcriptions, corrupting the heap and crashing the API process.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat AI Inference Server, Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift AI (RHOAI) · no fix planned: Red Hat AI Inference Server, Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift AI (RHOAI) · updated 2026-10-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-109311.json)","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":224402,"id":"CVE-2026-109311","ts":1792327399915,"field":"exploit_available","old":"false","new":"true"}]}