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: 0.7%CVSS: 9.8Exploit: None knownExposed services: Not assessed

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
9.8CRITICALmedium confidence
EG Risk
59
EG Risk 59/100CISA 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
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.7%
EPSS %ILE
51st
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (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 Sep 28, 2026
Patch available.
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 / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibswscale-ffmpeg3 (7:2.8.17-0ubuntu0.1+esm17) @ xenial2026-10-05ubuntu
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 67× in last 7d / 344× 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 490 total refreshes for this CVE.

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

Related CVEs(same product + 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 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 0.7% probability of exploitation in the next 30 days (51st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-75143?
CVE-2026-75143 has a CVSS base score of 9.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-75143?
A fix for CVE-2026-75143 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-75143 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-75143

Explore →

Is Your Infrastructure Affected by CVE-2026-75143?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs