CVE-2026-75146

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-08-19. a secondary CVSS source baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: None knownExposed: 0

A fix is available — apply it.

FFmpeg before commit 65b0dab contains an out-of-bounds read in the DASH demuxer (libavformat/dashdec.c). When a live DASH manifest is refreshed with a startNumber that is lower than the previous value, the current sequence number is driven negative. The fragment retrieval function checked only the upper bound before indexing the fragments array, allowing a negative index to be used and causing an out-of-bounds read. A malicious or misconfigured DASH server can trigger this by serving a live manifest with a decreasing startNumber across a manifest refresh.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity81% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
18%
KEV
Not listed

Published

August 19, 2026

Last Modified

August 31, 2026

Advisory Details (3)

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

FFmpeg Out-of-Bounds Read in DASH Demuxer via dashdec.c | Advisories | VulnCheck

https://www.vulncheck.com/advisories/ffmpeg-out-of-bounds-read-in-dash-demuxer-via-dashdec-c
generic

avformat/dashdec: reject a negative fragment index · 65b0dab903 - FFmpeg/FFmpeg - FFmpeg Forgejo

https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/65b0dab903e5975e036b30ecc58f5935d4f151e0
generic

#24093 - avformat/dashdec: reject a negative fragment index - FFmpeg/FFmpeg - FFmpeg Forgejo

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24093

Vendor Advisories for CVE-2026-75146(1)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibswscale4 (7:3.4.11-0ubuntu0.1+esm15) @ bionic2026-09-20ubuntu
ubuntulibswscale9 (7:8.0.1-3ubuntu2+esm4) @ resolute2026-09-20ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
ffmpeg7:5.1.3-1 ... 7:9.0.1-1 (59 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
ffmpeg7:7.1.1-1 ... 7:9.0.1-1 (23 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
ffmpeg7:7.1.1-1 ... 7:9.0.1-1 (19 versions)——

Weakness Classification(1)

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

All Vendor Advisories

(2)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 34× in last 7d / 129× 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 141 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-75146?
CVE-2026-75146 is a high vulnerability published on August 19, 2026. FFmpeg before commit 65b0dab contains an out-of-bounds read in the DASH demuxer (libavformat/dashdec.c). When a live DASH manifest is refreshed with a startNumber that is lower than the previous value, the current sequence number is driven negative. The fragment retrieval function checked only the…
When was CVE-2026-75146 disclosed?
CVE-2026-75146 was first published in the National Vulnerability Database on August 19, 2026, with the most recent update on August 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-75146 actively exploited?
CVE-2026-75146 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 81.7% of all scored CVEs.
What is the CVSS score of CVE-2026-75146?
CVE-2026-75146 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-75146?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-75146, 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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