EUVD-2026-62584
GHSA-63qj-83cj-jp3m
Severity by source
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/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
AV:L because crafted AV1 content must be fed to a local FFmpeg muxer invocation; UI:R for operator-initiated processing; C:H and A:H for memory disclosure and crash; no integrity impact.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/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 983dae9 contains an out-of-bounds read in the AV1 RTP packetizer (libavformat/rtpenc_av1.c). The keyframe detection loop that searches for a sequence header OBU advanced its pointer and remaining-size counter by the encoded header length plus the OBU payload size without first bounding the OBU size against the remaining data. A crafted OBU size causes the remaining-size counter to wrap to a positive value, causing the next loop iteration to dereference a pointer beyond the end of the packet buffer. A crafted AV1 input packet muxed to RTP triggers the out-of-bounds read.
AnalysisAI
Out-of-bounds read in FFmpeg's AV1 RTP packetizer (libavformat/rtpenc_av1.c) exposes any deployment using FFmpeg to mux AV1 video over RTP to memory disclosure and process crash via a crafted input. All FFmpeg versions prior to commit 983dae9 are affected across every platform. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that FFmpeg be invoked with the RTP output muxer ('-f rtp') on an input stream containing AV1 video (codec av1), specifically triggering the keyframe detection logic in libavformat/rtpenc_av1.c. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 base score of 6.9 (Medium) is backed by a vector of AV:L/AC:L/AT:N/PR:N/UI:P with VC:H and VA:H. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker operating a media upload service, or submitting content to a streaming back-end that internally muxes AV1 video to RTP, crafts an AV1 bitstream containing an OBU with an encoded payload size deliberately set to near the maximum representable value. When FFmpeg's keyframe detection loop processes the packet, the unbounded size arithmetic causes the remaining-byte counter to wrap, and the loop dereferences memory well past the end of the packet buffer on the next iteration. … |
| Remediation | The primary fix is to update FFmpeg to a build that includes commit 983dae9c19f46c87d597598c0fd2f2fcee0ad2f8 or later; distributions and downstream packagers should patch against that commit as a tagged release version has not been independently confirmed at time of analysis. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-125 – Out-of-bounds Read
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External POC / Exploit Code
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