CVE-2026-66041

HIGHNVD 7.88.8
EchelonGraph scoreMEDIUM confidence

“▲” beside the score: it is higher than NVD's CVSS score.

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, GitHub Security Advisory, NVD CVSS v3
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
8.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100

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 (value × EchelonGraph’s weight)
Severity88% × 45%
The EG Score, 8.8 of 10.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
40th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 24, 2026

Last Modified

August 7, 2026

Advisory Details (3)

Auto-updated Jul 24, 2026
Patch available.
Web page

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
Web page

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
Web page

#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 rangeFix by version rangeDependents
ffmpeg7:7.1.1-1 ... 7:9.0.2-1 (24 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
ffmpeg7:7.1.1-1 ... 7:9.0.1-1 (19 versions)
  • every version up to 7:9.0.2-1: fixed in 7:9.0.2-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 56× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 240 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 140 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  2. 2026-10-13 11:01 UTCEG score recompute
  3. 2026-10-13 11:01 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  4. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  5. 2026-10-12 15:46 UTCEG score recompute
  6. 2026-10-11 19:31 UTCEG score recompute
  7. 2026-10-11 16:46 UTCEG score recompute
  8. 2026-10-11 14:07 UTCEG score recompute
  9. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  12. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  13. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  14. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  15. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  16. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  17. 2026-10-04 07:42 UTCEG score recompute
  18. 2026-10-04 07:42 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  19. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  20. 2026-10-02 19:47 UTCEG score recompute
  21. 2026-10-02 19:47 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  22. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  23. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  24. 2026-10-01 05:58 UTCEG score recompute
  25. 2026-10-01 05:58 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
Show 75 more
  1. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  2. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  3. 2026-09-28 04:26 UTCEG score recompute
  4. 2026-09-28 04:26 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  5. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  6. 2026-09-25 10:01 UTCEG score recompute
  7. 2026-09-25 10:01 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  8. 2026-09-24 10:10 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  9. 2026-09-23 22:17 UTCEG score recompute
  10. 2026-09-23 22:17 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  11. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  12. 2026-09-23 10:02 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  13. 2026-09-22 22:09 UTCEG score recompute
  14. 2026-09-22 22:09 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  15. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  16. 2026-09-20 01:39 UTCEG score recompute
  17. 2026-09-20 01:39 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  18. 2026-09-18 22:27 UTCEG score recompute
  19. 2026-09-18 22:27 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  20. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  21. 2026-09-18 02:57 UTCEG score recompute
  22. 2026-09-18 02:57 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  23. 2026-09-17 01:58 UTCEG score recompute
  24. 2026-09-17 01:58 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  25. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  26. 2026-09-16 06:39 UTCEG score recompute
  27. 2026-09-16 06:39 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  28. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  29. 2026-09-15 09:35 UTCEG score recompute
  30. 2026-09-15 09:35 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  31. 2026-09-14 16:33 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  32. 2026-09-14 04:37 UTCEG score recompute
  33. 2026-09-14 04:37 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  34. 2026-09-13 16:44 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  35. 2026-09-13 04:51 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  36. 2026-09-12 16:57 UTCEG score recompute
  37. 2026-09-12 16:57 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  38. 2026-09-12 05:03 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  39. 2026-09-11 16:36 UTCEG score recompute
  40. 2026-09-11 16:36 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  41. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  42. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  43. 2026-09-11 02:32 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  44. 2026-09-10 13:35 UTCEG score recompute
  45. 2026-09-10 13:35 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  46. 2026-09-09 08:43 UTCEG score recompute
  47. 2026-09-09 08:43 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  48. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  49. 2026-09-07 21:23 UTCEG score recompute
  50. 2026-09-07 21:23 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  51. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  52. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  53. 2026-09-06 08:08 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  54. 2026-09-05 19:22 UTCEG score recompute
  55. 2026-09-05 19:22 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  56. 2026-09-05 15:31 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  57. 2026-09-05 06:52 UTCEG score recompute
  58. 2026-09-05 06:52 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  59. 2026-09-04 12:48 UTCEG score recompute
  60. 2026-09-04 12:48 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  61. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  62. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  63. 2026-09-01 23:15 UTCEG score recompute
  64. 2026-09-01 23:15 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  65. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  66. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  67. 2026-08-31 00:04 UTCEG score recompute
  68. 2026-08-31 00:04 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  69. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  70. 2026-08-30 12:11 UTCEG score recompute
  71. 2026-08-30 12:11 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  72. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  73. 2026-08-30 00:16 UTCEG score recompute
  74. 2026-08-30 00:16 UTCGHSA enrichmentGHSA-frhp-m687-9g3q · GitHub severity HIGH · GitHub CVSS 8.8
  75. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.5% · 42nd percentile

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-66041?
CVE-2026-66041 is a high-severity vulnerability; its CVE record was 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 made public?
CVE-2026-66041 was made public on July 4, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on July 24, 2026. EchelonGraph's copy of the record carries a last-modified date of August 7, 2026; the record at its source may have been updated since.
Is CVE-2026-66041 actively exploited?
CVE-2026-66041 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-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 (HIGH).
How do I remediate CVE-2026-66041?
A fix for CVE-2026-66041 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-66041 are linked in the Vendor Advisories panel on this page.

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