CVE-2026-75143

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-19. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

FFmpeg before commit 1c10bcc contains a heap buffer overflow in the RIST protocol reader (libavformat/librist.c). librist_read() ignored its size argument and copied the full received payload length into the caller-provided destination buffer, overflowing it when the payload exceeds the destination size. This is reachable via the async:rist:// URL scheme, where the async wrapper supplies a smaller buffer than the received payload. A remote RIST sender can trigger the overflow by sending a packet whose payload exceeds the caller buffer size.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
59(Track)
EG Risk 59/100SSVC: 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
Severity98% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

August 19, 2026

Last Modified

August 31, 2026

Advisory Details (3)

Auto-updated Sep 14, 2026
No patch confirmed yet.
generic

FFmpeg Heap Buffer Overflow via RIST Protocol Reader | Advisories | VulnCheck

https://www.vulncheck.com/advisories/ffmpeg-heap-buffer-overflow-via-rist-protocol-reader
generic

#24089 - avformat/librist: honor the caller buffer size in librist_read - FFmpeg/FFmpeg - FFmpeg Forgejo

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24089
generic

avformat/librist: honor the caller buffer size in librist_read · 1c10bcc2e1 - FFmpeg/FFmpeg - FFmpeg Forgejo

https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/1c10bcc2e17255dacb717a25ab3db142ce390602

Vendor Advisories for CVE-2026-75143(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
ubuntulibswscale5 (7:4.4.2-0ubuntu0.22.04.1+esm15) @ jammy2026-09-20ubuntu
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 93× in last 7d / 312× 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 333 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-75143?
CVE-2026-75143 is a critical vulnerability published on August 19, 2026. FFmpeg before commit 1c10bcc contains a heap buffer overflow in the RIST protocol reader (libavformat/librist.c). librist_read() ignored its size argument and copied the full received payload length into the caller-provided destination buffer, overflowing it when the payload exceeds the destination…
When was CVE-2026-75143 disclosed?
CVE-2026-75143 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-2026-75143 actively exploited?
CVE-2026-75143 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 65.4% of all scored CVEs.
What is the CVSS score of CVE-2026-75143?
CVE-2026-75143 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-75143?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-75143, 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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