EUVD-2026-62581
GHSA-mg5r-49w7-j3cv
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 vector with no privileges required; passive user interaction maps to UI:R; no scope change; all three impact dimensions high due to heap overflow enabling potential code execution.
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 1cdeb3c contains a heap buffer overflow vulnerability in the VC-2/Dirac RTP packetizer (libavformat/rtpenc_vc2hq.c) that allows attackers to trigger memory corruption by supplying a crafted Dirac data unit. The packetizer copies an input-derived data unit or fragment size into a fixed-size buffer without an upper bound check, causing a heap buffer overflow when the crafted input is packetized for RTP output.
AnalysisAI
Heap buffer overflow in FFmpeg's VC-2/Dirac RTP packetizer (libavformat/rtpenc_vc2hq.c) enables memory corruption via crafted Dirac data units across all versions prior to fix commit 1cdeb3c. The packetizer accepts an attacker-controlled data unit or fragment size and copies it into a fixed-size heap buffer without an upper-bound check, a classic CWE-122 condition with High confidentiality, integrity, and availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The VC-2/Dirac RTP packetizer (libavformat/rtpenc_vc2hq.c) must be active, requiring FFmpeg to be invoked with the vc2 codec targeting RTP output. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N) with a base score of 8.5 reflects a local attack surface: exploitation requires the target to process attacker-supplied media through FFmpeg's VC-2 RTP packetizer, and passive user interaction is necessary. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker able to supply a crafted Dirac media stream to a system using FFmpeg for RTP streaming constructs a data unit containing an oversized fragment size field. When FFmpeg packetizes this stream for RTP output via the VC-2 packetizer, the unchecked input-derived size drives a heap copy beyond the allocated buffer boundary, corrupting adjacent heap memory in a manner that may be steerable toward arbitrary code execution under the FFmpeg process's privileges. |
| Remediation | Upstream fix available (PR/commit); a released patched version number has not been independently confirmed beyond fix commit 1cdeb3c4e7f1f8566d846b9b451e01c376398818, available at https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/1cdeb3c4e7f1f8566d846b9b451e01c376398818. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all systems and applications using FFmpeg, particularly those handling RTP streams or video transport exposed to external networks, and flag them by criticality. …
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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