CVE-2026-89266

HIGHPre-NVD 8.28.2—
EchelonGraph scoreHIGH confidence

Score 8.2 from GitHub Security Advisory (severity: HIGH) published 2026-09-12. A secondary CVSS source baseline 8.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
8.2EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 8.2Exploit: Elevated riskExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

stb_vorbis through 1.22 contains a heap buffer overflow in start_decoder() where the codebook multiplicands allocation size is truncated from size_t to int. Attackers can craft a malicious Ogg Vorbis file with large entries and dimensions values to trigger out-of-bounds writes, causing process crashes or heap corruption.

CVSS v3
8.2
EG Score
8.2HIGHhigh confidence
EG Risk
68
EG Risk 68/100CISA 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
Severity82% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.6%
EPSS %ILE
48th
KEV
Not listed

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

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (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

September 11, 2026

Last Modified

September 24, 2026

Advisory Details (7)

Auto-updated Sep 11, 2026
No patch confirmed yet.
generic

stb_vorbis through 1.22 heap buffer overflow via codebook multiplicands | Advisories | VulnCheck

https://www.vulncheck.com/advisories/stb-vorbis-through-1.22-heap-buffer-overflow-via-codebook-multiplicands
generic

GitHub - nothings/stb: stb single-file public domain libraries for C/C++ · GitHub

https://github.com/nothings/stb
generic

stb/stb_vorbis.c at 2c980bb59875b0d32144a71867fbdebb2f77cd20 · nothings/stb · GitHub

https://github.com/nothings/stb/blob/2c980bb59875b0d32144a71867fbdebb2f77cd20/stb_vorbis.c#L950
generic

stb/stb_vorbis.c at 2c980bb59875b0d32144a71867fbdebb2f77cd20 · nothings/stb · GitHub

https://github.com/nothings/stb/blob/2c980bb59875b0d32144a71867fbdebb2f77cd20/stb_vorbis.c#L3878-L3880
generic

Heap buffer overflow via size_t-to-int truncation in stb_vorbis setup_malloc (codebook multiplicands) · Issue #1947 · nothings/stb · GitHub

https://github.com/nothings/stb/issues/1947
generic

stb_vorbis: integer overflow in codebook multiplicands allocation · Issue #1933 · nothings/stb · GitHub

https://github.com/nothings/stb/issues/1933
generic

many memory safety bugs in stb_image and stb_vorbis · Issue #1928 · nothings/stb · GitHub

https://github.com/nothings/stb/issues/1928

Vendor Advisories for CVE-2026-89266(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
libstb0.0~git20220908.8b5f1f3+ds-1 ... 0.0~git20250907.fede005+ds-1 (8 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
libstb0.0~git20241109.5c20573+ds-1, 0.0~git20250907.fede005+ds-1
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
libstb0.0~git20241109.5c20573+ds-1, 0.0~git20250907.fede005+ds-1
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 25× in last 7d / 99× 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.

  1. 2026-10-05 02:25 UTCEG score recompute
  2. 2026-10-05 02:25 UTCGHSA enrichment
  3. 2026-10-04 23:22 UTCEPSS rescore
  4. 2026-10-04 14:24 UTCGHSA enrichment
  5. 2026-10-04 02:05 UTCEG score recompute
  6. 2026-10-04 02:05 UTCGHSA enrichment
  7. 2026-10-03 14:05 UTCGHSA enrichment
  8. 2026-10-03 01:56 UTCEG score recompute
  9. 2026-10-03 01:56 UTCGHSA enrichment
  10. 2026-10-02 13:55 UTCGHSA enrichment
  11. 2026-10-02 01:53 UTCEG score recompute
  12. 2026-10-02 01:53 UTCGHSA enrichment
  13. 2026-10-01 19:51 UTCEPSS rescore
  14. 2026-10-01 13:39 UTCGHSA enrichment
  15. 2026-10-01 01:39 UTCEG score recompute
  16. 2026-10-01 01:39 UTCGHSA enrichment
  17. 2026-09-30 15:04 UTCEPSS rescore
  18. 2026-09-30 13:39 UTCGHSA enrichment
  19. 2026-09-30 01:38 UTCEG score recompute
  20. 2026-09-30 01:38 UTCGHSA enrichment
  21. 2026-09-29 09:22 UTCEG score recompute
  22. 2026-09-29 09:22 UTCGHSA enrichment
  23. 2026-09-28 21:22 UTCEG score recompute
  24. 2026-09-28 21:22 UTCGHSA enrichment
  25. 2026-09-28 13:52 UTCEPSS rescore
Show 74 more
  1. 2026-09-28 09:22 UTCGHSA enrichment
  2. 2026-09-27 21:21 UTCEG score recompute
  3. 2026-09-27 21:21 UTCGHSA enrichment
  4. 2026-09-27 13:48 UTCEPSS rescore
  5. 2026-09-27 09:21 UTCGHSA enrichment
  6. 2026-09-26 21:21 UTCEG score recompute
  7. 2026-09-26 21:21 UTCGHSA enrichment
  8. 2026-09-26 15:59 UTCEPSS rescore
  9. 2026-09-26 09:20 UTCEG score recompute
  10. 2026-09-26 09:19 UTCGHSA enrichment
  11. 2026-09-25 21:19 UTCGHSA enrichment
  12. 2026-09-25 09:19 UTCGHSA enrichment
  13. 2026-09-24 21:19 UTCEG score recompute
  14. 2026-09-24 21:19 UTCGHSA enrichment
  15. 2026-09-24 14:53 UTCEG score recompute
  16. 2026-09-24 14:53 UTCGHSA enrichment
  17. 2026-09-24 14:04 UTCEPSS rescore
  18. 2026-09-24 13:36 UTCGHSA enrichment
  19. 2026-09-24 01:35 UTCEG score recompute
  20. 2026-09-24 01:35 UTCGHSA enrichment
  21. 2026-09-23 17:54 UTCEPSS rescore
  22. 2026-09-23 13:35 UTCGHSA enrichment
  23. 2026-09-23 01:34 UTCEG score recompute
  24. 2026-09-23 01:34 UTCGHSA enrichment
  25. 2026-09-22 16:01 UTCEPSS rescore
  26. 2026-09-22 13:33 UTCGHSA enrichment
  27. 2026-09-22 01:33 UTCEG score recompute
  28. 2026-09-22 01:33 UTCGHSA enrichment
  29. 2026-09-21 21:09 UTCEPSS rescore
  30. 2026-09-21 13:33 UTCGHSA enrichment
  31. 2026-09-21 01:33 UTCEG score recompute
  32. 2026-09-21 01:33 UTCGHSA enrichment
  33. 2026-09-20 20:16 UTCEPSS rescore
  34. 2026-09-20 13:33 UTCEG score recompute
  35. 2026-09-20 13:32 UTCGHSA enrichment
  36. 2026-09-20 01:32 UTCEG score recompute
  37. 2026-09-20 01:32 UTCGHSA enrichment
  38. 2026-09-20 01:02 UTCEG score recompute
  39. 2026-09-20 01:02 UTCGHSA enrichment
  40. 2026-09-20 00:22 UTCEG score recompute
  41. 2026-09-20 00:22 UTCGHSA enrichment
  42. 2026-09-19 12:22 UTCGHSA enrichment
  43. 2026-09-19 00:22 UTCEG score recompute
  44. 2026-09-19 00:22 UTCGHSA enrichment
  45. 2026-09-18 19:28 UTCEPSS rescore
  46. 2026-09-18 12:22 UTCGHSA enrichment
  47. 2026-09-18 00:21 UTCEG score recompute
  48. 2026-09-18 00:21 UTCGHSA enrichment
  49. 2026-09-17 19:32 UTCEPSS rescore
  50. 2026-09-17 12:20 UTCGHSA enrichment
  51. 2026-09-17 00:20 UTCEG score recompute
  52. 2026-09-17 00:20 UTCGHSA enrichment
  53. 2026-09-16 14:09 UTCEPSS rescore
  54. 2026-09-16 12:19 UTCEG score recompute
  55. 2026-09-16 12:19 UTCGHSA enrichment
  56. 2026-09-16 05:15 UTCEPSS rescore
  57. 2026-09-16 00:18 UTCGHSA enrichment
  58. 2026-09-15 12:18 UTCEG score recompute
  59. 2026-09-15 12:18 UTCGHSA enrichment
  60. 2026-09-15 03:12 UTCEPSS rescore
  61. 2026-09-15 00:18 UTCGHSA enrichment
  62. 2026-09-14 12:18 UTCGHSA enrichment
  63. 2026-09-14 00:18 UTCEG score recompute
  64. 2026-09-14 00:18 UTCGHSA enrichment
  65. 2026-09-13 16:48 UTCEPSS rescore
  66. 2026-09-13 12:18 UTCGHSA enrichment
  67. 2026-09-13 00:18 UTCEG score recompute
  68. 2026-09-13 00:18 UTCGHSA enrichment
  69. 2026-09-12 15:02 UTCEPSS rescore
  70. 2026-09-12 12:18 UTCEG score recompute
  71. 2026-09-12 12:18 UTCGHSA enrichment
  72. 2026-09-12 00:18 UTCEG score recompute
  73. 2026-09-11 23:29 UTCEG score recompute
  74. 2026-09-11 23:28 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-89266?
CVE-2026-89266 is a high vulnerability published on September 11, 2026. stbvorbis through 1.22 contains a heap buffer overflow in startdecoder() where the codebook multiplicands allocation size is truncated from size_t to int. Attackers can craft a malicious Ogg Vorbis file with large entries and dimensions values to trigger out-of-bounds writes, causing process…
When was CVE-2026-89266 disclosed?
CVE-2026-89266 was first published on September 11, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-89266 actively exploited?
CVE-2026-89266 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (48th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-89266?
CVE-2026-89266 has a CVSS base score of 8.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-89266?
No fix for CVE-2026-89266 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-89266 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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