FFmpeg Out-of-Bounds Read in AV1 RTP Packetizer via rtpenc_av1.c (CVE-2026-75147) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-75147

FFmpeg Out-of-Bounds Read in AV1 RTP Packetizer via rtpenc_av1.c

Answer in brief

CVE-2026-75147 records a Unknown severity vulnerability in FFmpeg Out-of-Bounds Read in AV1 RTP Packetizer via rtpenc_av1.c. The current sources do not mark it as known exploited. The current feed maps FFmpeg/FFmpeg (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 19, 2026Updated Aug 19, 2026Source checked Aug 19, 2026First seen by HOL Aug 19, 2026Material review Aug 19, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps FFmpeg/FFmpeg (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
FFmpeg/FFmpeggeneric	>=0 <983dae9c19f46c87d597598c0fd2f2fcee0ad2f8	983dae9c19f46c87d597598c0fd2f2fcee0ad2f8

Recommended response

Check inventory. Check lockfiles and deployed manifests for FFmpeg/FFmpeg.
Review the reported fix. Update FFmpeg/FFmpeg to 983dae9c19f46c87d597598c0fd2f2fcee0ad2f8 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 19, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 19, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 19, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.