CVE-2026-70631

MEDIUMPre-NVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-08-07. A secondary CVSS source baseline 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

FFmpeg versions from 0.5 up to, but not including, 9.0 contain an uninitialized heap memory disclosure vulnerability in the native TIFF decoder in libavcodec/tiff.c. An attacker who can cause FFmpeg to decode a crafted TIFF file can supply a valid Deflate-compressed strip that terminates successfully after producing fewer bytes than the declared strip requires. The tiff_unpack_zlib() function allocates a heap buffer sized for the full declared strip but copies all declared rows via memcpy() regardless of how many bytes zlib actually decompressed, causing unwritten bytes that can contain stale data from prior heap allocations to be incorporated into decoded image output and potentially exposing sensitive data in persistent services.

CVSS v3
5.5
EG Score
5.5MEDIUMmedium confidence
EG Risk
25
EG Risk 25/100CISA 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
Severity55% × 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
0.2%
EPSS %ILE
6th
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 6, 2026

Last Modified

September 1, 2026

Advisory Details (4)

Auto-updated Aug 6, 2026
Patch available.
generic

#23899 - avcodec/tiff: reject inflate output shorter than the strip - FFmpeg/FFmpeg - FFmpeg Forgejo

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23899
generic

TIFF decoder · a991b1fecb - FFmpeg/FFmpeg - FFmpeg Forgejo

https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/a991b1fecbd8c9e6f4fc31c191bd12e4be27dbf7
generic

avcodec/tiff: reject inflate output shorter than the strip · 3c287af3af - FFmpeg/FFmpeg - FFmpeg Forgejo

https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/3c287af3affe1286350faa69c02bcc5d49de18bb
generic

avcodec/tiff: reject inflate output shorter than the strip · 2f234ea34c - FFmpeg/FFmpeg - FFmpeg Forgejo

https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/2f234ea34c81288e3840fca632dd16481d8de39f

Vendor Advisories for CVE-2026-70631(1)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibswscale5 (7:4.4.2-0ubuntu0.22.04.1+esm16) @ jammy2026-10-05ubuntu

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

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
ffmpeg7:4.3.2-0+deb11u2 ... 7:9.0-1 (92 versions)
  • every version on: no fix on record
—
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

(1)

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 20× in last 7d / 79× 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 165 total refreshes for this CVE.

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

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-70631?
CVE-2026-70631 is a medium vulnerability published on August 6, 2026. FFmpeg versions from 0.5 up to, but not including, 9.0 contain an uninitialized heap memory disclosure vulnerability in the native TIFF decoder in libavcodec/tiff.c. An attacker who can cause FFmpeg to decode a crafted TIFF file can supply a valid Deflate-compressed strip that terminates…
When was CVE-2026-70631 disclosed?
CVE-2026-70631 was first published on August 6, 2026, with the most recent update on September 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-70631 actively exploited?
CVE-2026-70631 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (6th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-70631?
CVE-2026-70631 has a CVSS base score of 5.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-70631?
A fix for CVE-2026-70631 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-70631 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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