CVE-2026-66041

HIGHNVD 7.88.8▲
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-24. NVD baseline CVSS 7.8; sources differ by 1.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%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 7.0 through 8.1.2, fixed in commit 4da9812, contains a heap out-of-bounds write vulnerability in the vf_quirc filter that allows an attacker to corrupt heap memory by supplying a crafted PGS/SUP subtitle file with mismatched frame dimensions. Attackers can provide a subtitle file whose second presentation has larger dimensions than its first, causing av_image_copy_plane() to copy data exceeding the initial allocation size into the undersized libquirc grayscale image buffer, resulting in heap corruption and process crash with potential for code execution.

CVSS v3
7.8
EG Score
8.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
43%
KEV
Not listed

Published

July 24, 2026

Last Modified

August 7, 2026

Advisory Details (3)

Auto-updated Jul 24, 2026
No patch confirmed yet.
generic

FFmpeg 7.0 - 8.1.2 Heap Out-of-Bounds Write via vf_quirc Filter | Advisories | VulnCheck

https://www.vulncheck.com/advisories/ffmpeg-heap-out-of-bounds-write-via-vf-quirc-filter
generic

avfilter/vf_quirc: resize the quirc buffers when the input size changes · 4da9812e25 - FFmpeg/FFmpeg - FFmpeg Forgejo

https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/4da9812e25894fb51d62a8875cfa8eb39b5e20f5
generic

#23625 - avfilter/vf_quirc: resize the quirc buffers when the input size changes - FFmpeg/FFmpeg - FFmpeg Forgejo

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23625

Vendor Advisories for CVE-2026-66041(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(2 across 2 ecosystems)
Debian:13(1)
PackageVulnerable rangeFixed inDependents
ffmpeg7:7.1.1-1 ... 7:9.0-1 (22 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
ffmpeg7:7.1.1-1 ... 7:9.0-1 (18 versions)——

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 21× in last 7d / 111× 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.

Showing the most recent 100 of 144 total refreshes for this CVE.

  1. 2026-08-30 01:22 UTCEPSS rescore
  2. 2026-08-30 00:16 UTCEG score recompute
  3. 2026-08-30 00:16 UTCGHSA enrichment
  4. 2026-08-28 21:42 UTCEPSS rescore
  5. 2026-08-27 21:52 UTCEG score recompute
  6. 2026-08-27 21:52 UTCGHSA enrichment
  7. 2026-08-27 09:59 UTCGHSA enrichment
  8. 2026-08-26 21:15 UTCEG score recompute
  9. 2026-08-26 21:14 UTCGHSA enrichment
  10. 2026-08-26 14:47 UTCEPSS rescore
  11. 2026-08-26 08:40 UTCGHSA enrichment
  12. 2026-08-25 20:47 UTCEG score recompute
  13. 2026-08-25 20:47 UTCGHSA enrichment
  14. 2026-08-25 13:49 UTCEPSS rescore
  15. 2026-08-25 08:50 UTCGHSA enrichment
  16. 2026-08-24 20:57 UTCEG score recompute
  17. 2026-08-24 20:57 UTCGHSA enrichment
  18. 2026-08-24 09:03 UTCGHSA enrichment
  19. 2026-08-23 21:09 UTCGHSA enrichment
  20. 2026-08-23 09:16 UTCEG score recompute
  21. 2026-08-23 09:16 UTCGHSA enrichment
  22. 2026-08-23 00:19 UTCEPSS rescore
  23. 2026-08-22 21:23 UTCGHSA enrichment
  24. 2026-08-22 09:24 UTCEG score recompute
  25. 2026-08-22 09:24 UTCGHSA enrichment
Show 75 more
  1. 2026-08-21 23:49 UTCEPSS rescore
  2. 2026-08-21 21:30 UTCGHSA enrichment
  3. 2026-08-21 09:37 UTCEG score recompute
  4. 2026-08-21 09:37 UTCGHSA enrichment
  5. 2026-08-20 22:56 UTCEPSS rescore
  6. 2026-08-20 21:43 UTCGHSA enrichment
  7. 2026-08-20 09:50 UTCGHSA enrichment
  8. 2026-08-19 21:57 UTCEG score recompute
  9. 2026-08-19 21:57 UTCGHSA enrichment
  10. 2026-08-19 17:04 UTCEPSS rescore
  11. 2026-08-19 10:03 UTCGHSA enrichment
  12. 2026-08-18 22:03 UTCEG score recompute
  13. 2026-08-18 22:03 UTCGHSA enrichment
  14. 2026-08-18 13:48 UTCEPSS rescore
  15. 2026-08-18 10:10 UTCGHSA enrichment
  16. 2026-08-17 22:11 UTCEG score recompute
  17. 2026-08-17 22:11 UTCGHSA enrichment
  18. 2026-08-17 13:47 UTCEPSS rescore
  19. 2026-08-17 10:17 UTCGHSA enrichment
  20. 2026-08-16 22:24 UTCEG score recompute
  21. 2026-08-16 22:24 UTCGHSA enrichment
  22. 2026-08-16 14:56 UTCEPSS rescore
  23. 2026-08-16 10:31 UTCEG score recompute
  24. 2026-08-16 10:31 UTCGHSA enrichment
  25. 2026-08-15 22:38 UTCGHSA enrichment
  26. 2026-08-15 10:45 UTCEG score recompute
  27. 2026-08-15 10:45 UTCGHSA enrichment
  28. 2026-08-15 01:30 UTCEPSS rescore
  29. 2026-08-14 22:51 UTCGHSA enrichment
  30. 2026-08-14 10:58 UTCGHSA enrichment
  31. 2026-08-13 23:05 UTCEG score recompute
  32. 2026-08-13 23:05 UTCGHSA enrichment
  33. 2026-08-13 22:00 UTCEPSS rescore
  34. 2026-08-13 11:11 UTCGHSA enrichment
  35. 2026-08-12 23:18 UTCEG score recompute
  36. 2026-08-12 23:18 UTCGHSA enrichment
  37. 2026-08-12 13:51 UTCEPSS rescore
  38. 2026-08-12 11:25 UTCGHSA enrichment
  39. 2026-08-11 23:31 UTCEG score recompute
  40. 2026-08-11 23:31 UTCGHSA enrichment
  41. 2026-08-11 11:38 UTCEG score recompute
  42. 2026-08-11 11:38 UTCGHSA enrichment
  43. 2026-08-11 00:00 UTCEPSS rescore
  44. 2026-08-10 23:45 UTCGHSA enrichment
  45. 2026-08-10 11:52 UTCGHSA enrichment
  46. 2026-08-09 23:59 UTCEG score recompute
  47. 2026-08-09 23:59 UTCGHSA enrichment
  48. 2026-08-09 13:47 UTCEPSS rescore
  49. 2026-08-09 12:06 UTCGHSA enrichment
  50. 2026-08-09 00:13 UTCEG score recompute
  51. 2026-08-09 00:13 UTCGHSA enrichment
  52. 2026-08-08 16:37 UTCEPSS rescore
  53. 2026-08-08 12:20 UTCGHSA enrichment
  54. 2026-08-08 00:26 UTCEG score recompute
  55. 2026-08-08 00:26 UTCGHSA enrichment
  56. 2026-08-07 12:33 UTCGHSA enrichment
  57. 2026-08-07 00:39 UTCEG score recompute
  58. 2026-08-07 00:39 UTCGHSA enrichment
  59. 2026-08-07 00:39 UTCNVD updateCVSS v3 → 7.8
  60. 2026-08-06 15:45 UTCEG score recompute
  61. 2026-08-06 15:45 UTCGHSA enrichment
  62. 2026-08-06 13:47 UTCEPSS rescore
  63. 2026-08-06 03:52 UTCEG score recompute
  64. 2026-08-06 03:52 UTCGHSA enrichment
  65. 2026-08-05 19:17 UTCEPSS rescore
  66. 2026-08-05 19:17 UTCEPSS rescore
  67. 2026-08-05 15:59 UTCGHSA enrichment
  68. 2026-08-05 04:06 UTCGHSA enrichment
  69. 2026-08-04 16:11 UTCEG score recompute
  70. 2026-08-04 16:11 UTCGHSA enrichment
  71. 2026-08-04 15:10 UTCEPSS rescore
  72. 2026-08-04 10:39 UTCEPSS rescore
  73. 2026-08-04 04:18 UTCGHSA enrichment
  74. 2026-08-03 16:25 UTCEG score recompute
  75. 2026-08-03 16:25 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-66041?
CVE-2026-66041 is a high vulnerability published on July 24, 2026. FFmpeg 7.0 through 8.1.2, fixed in commit 4da9812, contains a heap out-of-bounds write vulnerability in the vfquirc filter that allows an attacker to corrupt heap memory by supplying a crafted PGS/SUP subtitle file with mismatched frame dimensions. Attackers can provide a subtitle file whose second…
When was CVE-2026-66041 disclosed?
CVE-2026-66041 was first published in the National Vulnerability Database on July 24, 2026, with the most recent update on August 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66041 actively exploited?
CVE-2026-66041 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 57.0% of all scored CVEs.
What is the CVSS score of CVE-2026-66041?
CVE-2026-66041 has a CVSS v3 base score of 7.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.8.
How do I remediate CVE-2026-66041?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66041, 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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