CVE-2026-86289

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreHIGH confidence

Score 4.3 from GitHub Security Advisory (severity: LOW) published 2026-09-07. a secondary CVSS source baseline 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.3Exploit: Elevated riskExposed: 0

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

A vulnerability was found in Ollama up to 0.31.1. This issue affects the function readGGUFV1String of the file fs/ggml/gguf.go of the component GGUF Decoder. Performing a manipulation results in integer overflow. The attack is possible to be carried out remotely. The exploit has been made public and could be used. Upgrading to version 0.31.2-rc1 is capable of addressing this issue. The patch is named 67b6a1c2d45321e0cb3c04a18073f9818de7724b. It is recommended to upgrade the affected component.

CVSS v3
4.3
EG Score
4.3(high)
EG Risk
50(Attend)
EG Risk 50/100SSVC: Attend

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
Severity43% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
34%
KEV
Not listed

Published

September 7, 2026

Last Modified

September 11, 2026

Advisory Details (4)

Auto-updated Sep 7, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr, github_commit.
generic

GitHub - ollama/ollama: Get up and running with Kimi-K2.6, GLM-5.2, MiniMax, DeepSeek, gpt-oss, Qwen, Gemma and other models. · GitHub

https://github.com/ollama/ollama/
github_commit

commit 67b6a1c2d453 (ollama/ollama)

Fix landed in ollama/ollama commit 67b6a1c2d453 — awaiting tagged release

https://github.com/ollama/ollama/commit/67b6a1c2d45321e0cb3c04a18073f9818de7724b
github_pr

create: harden GGUF create flows

Fix merged in ollama/ollama PR #17062 on 2026-07-06 — awaiting tagged release

https://github.com/ollama/ollama/pull/17062
generic

fs/ggml: malicious GGUF v1 crashes decoder — zero-length string underflows Truncate (DoS) · Issue #17033 · ollama/ollama · GitHub

https://github.com/ollama/ollama/issues/17033

Vendor Advisories for CVE-2026-86289(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 19× in last 7d / 41× 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. 2026-09-19 04:11 UTCEG score recompute
  2. 2026-09-19 04:10 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 03:13 UTCEG score recompute
  5. 2026-09-18 03:13 UTCGHSA enrichment
  6. 2026-09-17 19:32 UTCEPSS rescore
  7. 2026-09-17 02:15 UTCEG score recompute
  8. 2026-09-17 02:15 UTCGHSA enrichment
  9. 2026-09-16 14:09 UTCEPSS rescore
  10. 2026-09-16 05:15 UTCEPSS rescore
  11. 2026-09-16 01:17 UTCEG score recompute
  12. 2026-09-16 01:16 UTCGHSA enrichment
  13. 2026-09-15 03:12 UTCEPSS rescore
  14. 2026-09-15 03:12 UTCEPSS rescore
  15. 2026-09-15 00:18 UTCGHSA enrichment
  16. 2026-09-13 23:20 UTCEG score recompute
  17. 2026-09-13 23:20 UTCGHSA enrichment
  18. 2026-09-12 22:22 UTCEG score recompute
  19. 2026-09-12 22:22 UTCGHSA enrichment
  20. 2026-09-11 21:24 UTCEG score recompute
  21. 2026-09-11 21:24 UTCGHSA enrichment
  22. 2026-09-11 21:20 UTCNVD updateCVSS v4 → 2.1
  23. 2026-09-11 20:47 UTCEG score recompute
  24. 2026-09-11 20:47 UTCGHSA enrichment
  25. 2026-09-11 20:43 UTCMITRE cvelistV5CVSS v4 → 5.3
Show 16 more
  1. 2026-09-11 17:25 UTCEG score recompute
  2. 2026-09-11 17:25 UTCGHSA enrichment
  3. 2026-09-11 14:53 UTCEPSS rescore
  4. 2026-09-11 14:53 UTCEPSS rescore
  5. 2026-09-10 15:53 UTCEG score recompute
  6. 2026-09-10 15:53 UTCGHSA enrichment
  7. 2026-09-09 14:55 UTCEG score recompute
  8. 2026-09-09 14:55 UTCGHSA enrichment
  9. 2026-09-08 22:01 UTCEPSS rescore
  10. 2026-09-08 13:56 UTCGHSA enrichment
  11. 2026-09-08 10:30 UTCEG score recompute
  12. 2026-09-08 10:30 UTCGHSA enrichment
  13. 2026-09-07 09:30 UTCEG score recompute
  14. 2026-09-07 09:30 UTCNVD updateCVSS v4 → 2.1
  15. 2026-09-07 08:53 UTCEG score recompute
  16. 2026-09-07 08:51 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-86289?
CVE-2026-86289 is a medium vulnerability published on September 7, 2026. A vulnerability was found in Ollama up to 0.31.1. This issue affects the function readGGUFV1String of the file fs/ggml/gguf.go of the component GGUF Decoder. Performing a manipulation results in integer overflow. The attack is possible to be carried out remotely. The exploit has been made public…
When was CVE-2026-86289 disclosed?
CVE-2026-86289 was first published in the National Vulnerability Database on September 7, 2026, with the most recent update on September 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-86289 actively exploited?
CVE-2026-86289 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 66.0% of all scored CVEs.
What is the CVSS score of CVE-2026-86289?
CVE-2026-86289 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-86289?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86289, 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

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