CVE-2026-43631

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-07. A secondary CVSS source baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.1EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 8.1Exploit: None knownExposed services: Not assessed

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

llama.cpp builds b7492 through the latest b9060 contains a use-after-free vulnerability in the vocab pointer of llama-server when the --sleep-idle-seconds feature is enabled, allowing unauthenticated remote attackers to execute arbitrary code. Attackers can trigger the vulnerability by sending requests to affected endpoints while the server transitions to sleep mode, causing concurrent worker threads to dereference a freed vocab pointer that can be reclaimed with attacker-controlled data to achieve remote code execution.

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%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* 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, and watch the vendor's advisory for the fix.
EPSS PROB
0.6%
EPSS %ILE
45th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* 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, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (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 6, 2026

Last Modified

September 21, 2026

Advisory Details (1)

Auto-updated Aug 6, 2026
No patch confirmed yet.
generic

GitHub - Vladimir-tokarev-cyera/llama-cpp-security-patches: Security patches for unpatched llama.cpp vulnerabilities (CVE-2026-43626 through CVE-2026-43632) — Cyera Research · GitHub

https://github.com/Vladimir-tokarev-cyera/llama-cpp-security-patches

Vendor Advisories for CVE-2026-43631(1)

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

Affected Packages

(1 across 1 ecosystem)
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
llama.cpp10108+dfsg-1 ... 9951+dfsg-3 (59 versions)
  • every version on: no fix on record
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 17× in last 7d / 90× 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 210 total refreshes for this CVE.

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

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-43631?
CVE-2026-43631 is a high vulnerability published on August 6, 2026. llama.cpp builds b7492 through the latest b9060 contains a use-after-free vulnerability in the vocab pointer of llama-server when the --sleep-idle-seconds feature is enabled, allowing unauthenticated remote attackers to execute arbitrary code. Attackers can trigger the vulnerability by sending…
When was CVE-2026-43631 disclosed?
CVE-2026-43631 was first published on August 6, 2026, with the most recent update on September 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43631 actively exploited?
CVE-2026-43631 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (45th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-43631?
CVE-2026-43631 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-2026-43631?
No fix for CVE-2026-43631 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-2026-43631 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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