CVE-2026-75141

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-19. a secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
7.8
EG Score
7.8(high)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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 computed
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
4%
KEV
Not listed

Published

August 19, 2026

Last Modified

August 21, 2026

Advisory Details (3)

Auto-updated Aug 19, 2026
No patch confirmed yet.
generic

FFmpeg Heap Buffer Overflow in hvcC Box Writer via HEVC Muxing | Advisories | VulnCheck

https://www.vulncheck.com/advisories/ffmpeg-heap-buffer-overflow-in-hvcc-box-writer-via-hevc-muxing
generic

avformat/hevc: reject hvcC NAL arrays that overflow the 16-bit count · acf5d7cdc1 - FFmpeg/FFmpeg - FFmpeg Forgejo

https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/acf5d7cdc1f9ae8752c23e1ea8d7f355ed780781
generic

#24088 - avformat/hevc: reject hvcC NAL arrays that overflow the 16-bit count - FFmpeg/FFmpeg - FFmpeg Forgejo

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24088

Vendor Advisories for CVE-2026-75141(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 14× in last 7d / 14× 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.

  1. 2026-08-21 04:36 UTCEG score recompute
  2. 2026-08-21 04:36 UTCGHSA enrichment
  3. 2026-08-21 04:02 UTCEG score recompute
  4. 2026-08-21 04:01 UTCGHSA enrichment
  5. 2026-08-20 22:56 UTCEPSS rescore
  6. 2026-08-20 16:37 UTCEG score recompute
  7. 2026-08-20 16:37 UTCGHSA enrichment
  8. 2026-08-20 15:57 UTCEG score recompute
  9. 2026-08-20 15:57 UTCGHSA enrichment
  10. 2026-08-20 06:35 UTCEG score recompute
  11. 2026-08-20 06:35 UTCGHSA enrichment
  12. 2026-08-19 17:38 UTCEG score recompute
  13. 2026-08-19 16:44 UTCEG score recompute
  14. 2026-08-19 16:43 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-75141?
CVE-2026-75141 is a high vulnerability published on August 19, 2026. 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…
When was CVE-2026-75141 disclosed?
CVE-2026-75141 was first published in the National Vulnerability Database on August 19, 2026, with the most recent update on August 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-75141 actively exploited?
CVE-2026-75141 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 96.4% of all scored CVEs.
What is the CVSS score of CVE-2026-75141?
CVE-2026-75141 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-75141?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-75141, 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

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