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.
CVE-2026-75147
HIGHPre-NVD 7.17.1—Trending — 4 sources updated this week
EchelonGraph scoreHIGH confidence
Score 7.1 from GitHub Security Advisory published 2026-08-19. a secondary CVSS source baseline 7.1; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, secondary
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.1Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 7.1
- EG Score
- 7.1(high)
- EG Risk
- 36(Track)EG Risk 36/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity71% × 45%Exploitation0% × 40%Automatability30% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 2%
- KEV
- Not listed
Published
August 19, 2026
Last Modified
August 19, 2026
Advisory Details (2)
Auto-updated Aug 19, 2026No patch confirmed yet.
generic
#24096 - avformat/rtpenc_av1: bound OBU size in the keyframe search loop - FFmpeg/FFmpeg - FFmpeg Forgejo
https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24096generic
avformat/rtpenc_av1: bound OBU size in the keyframe search loop · 983dae9c19 - FFmpeg/FFmpeg - FFmpeg Forgejo
https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/983dae9c19f46c87d597598c0fd2f2fcee0ad2f8Vendor Advisories for CVE-2026-75147(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 7× in last 7d / 7× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-08-20 22:56 UTCEPSS rescore
- 2026-08-20 19:56 UTCGHSA enrichment
- 2026-08-20 06:46 UTCEG score recompute
- 2026-08-20 06:46 UTCGHSA enrichment
- 2026-08-19 17:38 UTCEG score recompute
- 2026-08-19 16:43 UTCEG score recompute
- 2026-08-19 16:43 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Same CWE
10 shownCWE-125
- CVE-2013-0767EG 10.0EPSS p93HIGH
- CVE-2009-2523EG 10.0EPSS p98HIGH
- CVE-2014-2898EG 9.8CRITICAL
- CVE-2014-2897EG 9.8CRITICAL
- CVE-2014-2896EG 9.8CRITICAL
- CVE-1999-0006EG 9.8EPSS p96CRITICAL
- CVE-2014-1522EG 9.3EPSS p92HIGH
- CVE-2013-0779EG 9.3EPSS p92HIGH
- CVE-2013-0778EG 9.3EPSS p90HIGH
- CVE-2012-3995EG 9.3EPSS p92HIGH
Frequently asked(5)
What is CVE-2026-75147?
CVE-2026-75147 is a high vulnerability published on August 19, 2026. 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…
When was CVE-2026-75147 disclosed?
CVE-2026-75147 was first published in the National Vulnerability Database on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-75147 actively exploited?
CVE-2026-75147 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 97.7% of all scored CVEs.
What is the CVSS score of CVE-2026-75147?
CVE-2026-75147 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-75147?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-75147, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-75147
Is Your Infrastructure Affected by CVE-2026-75147?
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