CVE-2026-43631

HIGHPre-NVD 8.18.1—
EchelonGraph scoreHIGH confidence

Score 8.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-07. the CNA's CVSS baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this week
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: None knownExposed: 0

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

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
8.1(high)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity81% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

August 6, 2026

Last Modified

August 14, 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 rangeFixed inDependents
llama.cpp10108+dfsg-1 ... 9951+dfsg-3 (50 versions)——

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 29× in last 7d / 64× 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. 2026-08-20 14:56 UTCGHSA enrichment
  2. 2026-08-20 03:08 UTCEG score recompute
  3. 2026-08-20 03:08 UTCGHSA enrichment
  4. 2026-08-19 17:04 UTCEPSS rescore
  5. 2026-08-19 15:21 UTCGHSA enrichment
  6. 2026-08-19 03:30 UTCGHSA enrichment
  7. 2026-08-18 15:42 UTCEG score recompute
  8. 2026-08-18 15:42 UTCGHSA enrichment
  9. 2026-08-18 13:48 UTCEPSS rescore
  10. 2026-08-18 03:41 UTCGHSA enrichment
  11. 2026-08-17 15:54 UTCEG score recompute
  12. 2026-08-17 15:54 UTCGHSA enrichment
  13. 2026-08-17 13:47 UTCEPSS rescore
  14. 2026-08-17 04:07 UTCGHSA enrichment
  15. 2026-08-16 16:20 UTCEG score recompute
  16. 2026-08-16 16:19 UTCGHSA enrichment
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-16 04:32 UTCEG score recompute
  19. 2026-08-16 04:32 UTCGHSA enrichment
  20. 2026-08-16 02:14 UTCEPSS rescore
  21. 2026-08-15 16:45 UTCGHSA enrichment
  22. 2026-08-15 04:58 UTCEG score recompute
  23. 2026-08-15 04:58 UTCGHSA enrichment
  24. 2026-08-15 01:30 UTCEPSS rescore
  25. 2026-08-14 17:10 UTCEG score recompute
Show 39 more
  1. 2026-08-14 17:10 UTCGHSA enrichment
  2. 2026-08-14 16:35 UTCGHSA enrichment
  3. 2026-08-14 04:48 UTCEG score recompute
  4. 2026-08-14 04:48 UTCGHSA enrichment
  5. 2026-08-13 22:00 UTCEPSS rescore
  6. 2026-08-13 17:00 UTCGHSA enrichment
  7. 2026-08-13 05:12 UTCGHSA enrichment
  8. 2026-08-12 17:25 UTCEG score recompute
  9. 2026-08-12 17:25 UTCGHSA enrichment
  10. 2026-08-12 13:51 UTCEPSS rescore
  11. 2026-08-12 05:38 UTCGHSA enrichment
  12. 2026-08-11 17:47 UTCEG score recompute
  13. 2026-08-11 17:47 UTCGHSA enrichment
  14. 2026-08-11 13:43 UTCEPSS rescore
  15. 2026-08-11 06:00 UTCEG score recompute
  16. 2026-08-11 06:00 UTCGHSA enrichment
  17. 2026-08-11 00:00 UTCEPSS rescore
  18. 2026-08-10 18:13 UTCGHSA enrichment
  19. 2026-08-10 06:25 UTCGHSA enrichment
  20. 2026-08-09 18:38 UTCEG score recompute
  21. 2026-08-09 18:38 UTCGHSA enrichment
  22. 2026-08-09 13:46 UTCEPSS rescore
  23. 2026-08-09 06:51 UTCGHSA enrichment
  24. 2026-08-08 19:04 UTCEG score recompute
  25. 2026-08-08 19:04 UTCGHSA enrichment
  26. 2026-08-08 16:37 UTCEPSS rescore
  27. 2026-08-08 07:16 UTCGHSA enrichment
  28. 2026-08-07 19:29 UTCEG score recompute
  29. 2026-08-07 19:29 UTCGHSA enrichment
  30. 2026-08-07 19:12 UTCEG score recompute
  31. 2026-08-07 19:12 UTCGHSA enrichment
  32. 2026-08-07 14:27 UTCEG score recompute
  33. 2026-08-07 14:26 UTCGHSA enrichment
  34. 2026-08-07 14:13 UTCEG score recompute
  35. 2026-08-07 14:13 UTCGHSA enrichment
  36. 2026-08-07 10:05 UTCEG score recompute
  37. 2026-08-07 10:05 UTCGHSA enrichment
  38. 2026-08-06 22:18 UTCEG score recompute
  39. 2026-08-06 22:15 UTCMITRE cvelistV5first tracked

Related CVEs(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 in the National Vulnerability Database on August 6, 2026, with the most recent update on August 14, 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% probability of exploitation in the next 30 days, which ranks it in the top 65.5% of all scored CVEs.
What is the CVSS score of CVE-2026-43631?
CVE-2026-43631 has a CVSS v4.0 base score of 8.1 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-43631?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43631, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-43631

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