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: 0.3%CVSS: 8.1Exploit: None knownExposed services: Not assessed

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
8.1HIGHmedium confidence
EG Risk
37
EG Risk 37/100CISA SSVC

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%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
16th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 19, 2026

Last Modified

August 31, 2026

Advisory Details (3)

Auto-updated Aug 19, 2026
Patch available.
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 / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibswscale5 (7:4.4.2-0ubuntu0.22.04.1+esm15) @ jammy2026-10-05ubuntu
ubuntulibswscale9 (7:8.0.1-3ubuntu2+esm4) @ resolute2026-10-05ubuntu

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 rangeFix by version rangeDependents
ffmpeg7:5.1.3-1 ... 7:9.0.2-1 (60 versions)
  • every version on: no fix on record
—
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.

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 33× in last 7d / 146× 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 214 total refreshes for this CVE.

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

Related CVEs(same product + 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 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 0.3% probability of exploitation in the next 30 days (16th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-75146?
CVE-2026-75146 has a CVSS base score of 8.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-75146?
A fix for CVE-2026-75146 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-75146 are linked in the Vendor Advisories panel on this page.

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