CVE-2026-90691

HIGHPre-NVD 8.38.3—
EchelonGraph scoreHIGH confidence

Score 8.3 from GitHub Security Advisory published 2026-09-14. a secondary CVSS source baseline 8.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
8.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.3Exploit: Elevated riskExposed: 0

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

A security vulnerability has been detected in 0x4m4 HexStrike AI up to d689933ff579d839c676c82b231f8e98326c5f04. The impacted element is the function FileOperationsManager of the file hexstrike_server.py of the component API Files Endpoint. The manipulation of the argument filename leads to path traversal. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used. The project was informed of the problem early through an issue report but has not responded yet.

CVSS v3
8.3
EG Score
8.3(high)
EG Risk
68(Attend)
EG Risk 68/100SSVC: 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
Severity83% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
47%
KEV
Not listed

Published

September 14, 2026

Last Modified

September 14, 2026

Advisory Details (3)

Auto-updated Sep 14, 2026
🔬 Proof of concept available. No patch confirmed yet. Sources: github_pr.
generic

Path Traversal in File Sandbox Allows Arbitrary File Write Outside Base Directory · Issue #135 · 0x4m4/hexstrike-ai · GitHub

https://github.com/0x4m4/hexstrike-ai/issues/135
github_pr

fix: prevent path traversal in FileOperationsManager sandbox (CWE-22)

Upstream fix in progress (PR #159 · 0x4m4/hexstrike-ai, state=closed)

https://github.com/0x4m4/hexstrike-ai/pull/159
generic🟡 PoC Available

Arbitrary File Write Leading to Remote Code Execution via Path Traversal in `/api/files/create` and `/api/files/modify` · Issue #225 · 0x4m4/hexstrike-ai · GitHub

https://github.com/0x4m4/hexstrike-ai/issues/225

Vendor Advisories for CVE-2026-90691(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 26× in last 7d / 51× 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. 2026-09-25 05:45 UTCGHSA enrichment
  2. 2026-09-24 16:42 UTCEG score recompute
  3. 2026-09-24 16:42 UTCGHSA enrichment
  4. 2026-09-24 14:04 UTCEPSS rescore
  5. 2026-09-24 03:25 UTCEG score recompute
  6. 2026-09-24 03:25 UTCGHSA enrichment
  7. 2026-09-23 17:54 UTCEPSS rescore
  8. 2026-09-23 14:22 UTCGHSA enrichment
  9. 2026-09-23 01:17 UTCEG score recompute
  10. 2026-09-23 01:17 UTCGHSA enrichment
  11. 2026-09-22 16:01 UTCEPSS rescore
  12. 2026-09-22 12:14 UTCGHSA enrichment
  13. 2026-09-21 23:10 UTCEG score recompute
  14. 2026-09-21 23:10 UTCGHSA enrichment
  15. 2026-09-21 21:09 UTCEPSS rescore
  16. 2026-09-21 10:07 UTCGHSA enrichment
  17. 2026-09-20 21:04 UTCEG score recompute
  18. 2026-09-20 21:04 UTCGHSA enrichment
  19. 2026-09-20 20:16 UTCEPSS rescore
  20. 2026-09-20 07:59 UTCGHSA enrichment
  21. 2026-09-19 18:44 UTCEG score recompute
  22. 2026-09-19 18:44 UTCGHSA enrichment
  23. 2026-09-19 05:40 UTCEG score recompute
  24. 2026-09-19 05:40 UTCGHSA enrichment
  25. 2026-09-18 19:28 UTCEPSS rescore
Show 26 more
  1. 2026-09-18 16:37 UTCGHSA enrichment
  2. 2026-09-18 03:33 UTCEG score recompute
  3. 2026-09-18 03:33 UTCGHSA enrichment
  4. 2026-09-17 19:32 UTCEPSS rescore
  5. 2026-09-17 14:30 UTCGHSA enrichment
  6. 2026-09-17 01:24 UTCEG score recompute
  7. 2026-09-17 01:24 UTCGHSA enrichment
  8. 2026-09-16 14:09 UTCEPSS rescore
  9. 2026-09-16 12:20 UTCEG score recompute
  10. 2026-09-16 12:20 UTCGHSA enrichment
  11. 2026-09-16 05:15 UTCEPSS rescore
  12. 2026-09-15 23:16 UTCGHSA enrichment
  13. 2026-09-15 10:09 UTCEG score recompute
  14. 2026-09-15 10:09 UTCGHSA enrichment
  15. 2026-09-15 03:12 UTCEPSS rescore
  16. 2026-09-14 21:05 UTCGHSA enrichment
  17. 2026-09-14 17:27 UTCEG score recompute
  18. 2026-09-14 17:27 UTCGHSA enrichment
  19. 2026-09-14 17:26 UTCNVD updateCVSS v4 → 5.5
  20. 2026-09-14 16:35 UTCEG score recompute
  21. 2026-09-14 16:35 UTCGHSA enrichment
  22. 2026-09-14 16:34 UTCMITRE cvelistV5CVSS v4 → 6.9
  23. 2026-09-14 07:20 UTCEG score recompute
  24. 2026-09-14 07:20 UTCNVD updateCVSS v4 → 5.5
  25. 2026-09-14 06:55 UTCEG score recompute
  26. 2026-09-14 06:54 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-90691?
CVE-2026-90691 is a high vulnerability published on September 14, 2026. A security vulnerability has been detected in 0x4m4 HexStrike AI up to d689933ff579d839c676c82b231f8e98326c5f04. The impacted element is the function FileOperationsManager of the file hexstrike_server.py of the component API Files Endpoint. The manipulation of the argument filename leads to path…
When was CVE-2026-90691 disclosed?
CVE-2026-90691 was first published in the National Vulnerability Database on September 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-90691 actively exploited?
CVE-2026-90691 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 52.5% of all scored CVEs.
What is the CVSS score of CVE-2026-90691?
CVE-2026-90691 has a CVSS v3 base score of 8.3 (NVD).
How do I remediate CVE-2026-90691?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-90691, 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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