EUVD-2026-62578
GHSA-72cw-2m7j-25c8
Severity by source
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Local file-based attack requiring the victim to mux a crafted HEVC input; no privileges needed but user interaction is required, with unchanged scope.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
2DescriptionCVE.org
FFmpeg before commit acf5d7c contains a heap buffer overflow in the hvcC box writer. When writing an HEVC configuration record with more NAL units of a single type than the count field can represent, the NAL unit count overflows, causing a heap buffer overflow. A crafted HEVC input file triggers the overflow during muxing.
AnalysisAI
Heap buffer overflow in FFmpeg's hvcC box writer exposes any version prior to commit acf5d7c to memory corruption during HEVC muxing. When a crafted HEVC file presents more NAL units of a single type than the count field can encode, integer overflow corrupts heap memory, potentially enabling arbitrary code execution in the FFmpeg process context. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires FFmpeg to perform an HEVC muxing operation on a crafted input file where the number of NAL units of a single type exceeds the representable range of the hvcC count field. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 8.5 with vector AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H reflects high impact across all three CIA pillars but is gated by a local attack vector and passive user interaction. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker uploads a crafted HEVC video file to a media transcoding API that internally invokes FFmpeg to remux the content. During the hvcC box writing phase, the abnormally large NAL unit array causes a count field overflow, corrupting heap metadata adjacent to the write buffer. … |
| Remediation | The upstream fix is available as commit acf5d7cdc1f9ae8752c23e1ea8d7f355ed780781 in the FFmpeg repository (https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/acf5d7cdc1f9ae8752c23e1ea8d7f355ed780781), associated with pull request #24088 (https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24088). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Conduct immediate triage within 24 hours to identify all FFmpeg deployments in transcoding pipelines and rank by exposure to untrusted video input. …
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FFmpeg <=4.3 contains a buffer overflow vulnerability in libavcodec through a crafted file that may lead to remote code
Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
Leaving vuln.today