CVE-2026-71963

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-03. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: Elevated riskExposed: 0

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

Hermes Agent 0.18.2 through 0.21.0, fixed in commit f6234d0, contains a remote code execution vulnerability that allows attackers to execute arbitrary OS commands by supplying a malicious repository with a crafted .git/config that sets core.fsmonitor to an attacker-controlled command. When a user opens the malicious repository and sends any message, the agent triggers a git status index refresh which executes the injected command in the user's process context, exposing the full environment including configured provider API keys.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
56(Track*)
EG Risk 56/100SSVC: 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
Severity88% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
1%
EPSS %ILE
57%
KEV
Not listed

Published

September 3, 2026

Last Modified

September 8, 2026

Advisory Details (4)

Auto-updated Sep 3, 2026
🔬 Proof of concept available. Upstream fix merged — awaiting tagged release. Sources: github_pr, github_commit.
generic

Hermes Agent 0.18.2 - 0.21.0 RCE via git core.fsmonitor Config Injection | Advisories | VulnCheck

https://www.vulncheck.com/advisories/hermes-agent-rce-via-git-core-fsmonitor-config-injection
github_commit

commit f6234d00c5d5 (NousResearch/hermes-agent)

Fix landed in NousResearch/hermes-agent commit f6234d00c5d5 — awaiting tagged release

https://github.com/NousResearch/hermes-agent/commit/f6234d00c5d59450adea1d7edd30ad3859375c79
github_pr

GitSpawn RCE no longer executes from a malicious repo's .git/config (GHSA-7x36-8jrh-v4pw)

Fix merged in NousResearch/hermes-agent PR #101483 on 2026-09-02 — awaiting tagged release

https://github.com/NousResearch/hermes-agent/pull/101483
generic🟡 PoC Available

GitSpawn: A Single Flaw Lets Untrusted Repos Run Code in Claude Code, Codex, Cursor, and Grok - Manifold Security

https://www.manifold.security/blog/ai-coding-agents-git-hijack

Vendor Advisories for CVE-2026-71963(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 25× in last 7d / 82× 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 03:12 UTCGHSA enrichment
  2. 2026-09-24 15:35 UTCEG score recompute
  3. 2026-09-24 15:35 UTCGHSA enrichment
  4. 2026-09-24 04:12 UTCEG score recompute
  5. 2026-09-24 04:12 UTCGHSA enrichment
  6. 2026-09-23 17:54 UTCEPSS rescore
  7. 2026-09-23 16:47 UTCGHSA enrichment
  8. 2026-09-23 05:24 UTCGHSA enrichment
  9. 2026-09-22 18:01 UTCEG score recompute
  10. 2026-09-22 18:01 UTCGHSA enrichment
  11. 2026-09-22 06:16 UTCEG score recompute
  12. 2026-09-22 06:16 UTCGHSA enrichment
  13. 2026-09-21 21:09 UTCEPSS rescore
  14. 2026-09-21 18:53 UTCGHSA enrichment
  15. 2026-09-21 07:29 UTCEG score recompute
  16. 2026-09-21 07:29 UTCGHSA enrichment
  17. 2026-09-20 20:16 UTCEPSS rescore
  18. 2026-09-20 19:33 UTCGHSA enrichment
  19. 2026-09-20 08:10 UTCGHSA enrichment
  20. 2026-09-19 20:17 UTCEG score recompute
  21. 2026-09-19 20:17 UTCGHSA enrichment
  22. 2026-09-19 08:54 UTCGHSA enrichment
  23. 2026-09-18 21:24 UTCEG score recompute
  24. 2026-09-18 21:24 UTCGHSA enrichment
  25. 2026-09-18 19:28 UTCEPSS rescore
Show 57 more
  1. 2026-09-18 09:02 UTCGHSA enrichment
  2. 2026-09-17 21:38 UTCEG score recompute
  3. 2026-09-17 21:38 UTCGHSA enrichment
  4. 2026-09-17 10:14 UTCGHSA enrichment
  5. 2026-09-16 22:51 UTCEG score recompute
  6. 2026-09-16 22:50 UTCGHSA enrichment
  7. 2026-09-16 14:08 UTCEPSS rescore
  8. 2026-09-16 11:27 UTCEG score recompute
  9. 2026-09-16 11:27 UTCGHSA enrichment
  10. 2026-09-16 05:15 UTCEPSS rescore
  11. 2026-09-15 23:59 UTCGHSA enrichment
  12. 2026-09-15 12:36 UTCEG score recompute
  13. 2026-09-15 12:35 UTCGHSA enrichment
  14. 2026-09-15 03:12 UTCEPSS rescore
  15. 2026-09-15 01:11 UTCGHSA enrichment
  16. 2026-09-14 13:47 UTCGHSA enrichment
  17. 2026-09-14 02:23 UTCEG score recompute
  18. 2026-09-14 02:23 UTCGHSA enrichment
  19. 2026-09-13 15:00 UTCGHSA enrichment
  20. 2026-09-13 03:37 UTCGHSA enrichment
  21. 2026-09-12 16:13 UTCEG score recompute
  22. 2026-09-12 16:13 UTCGHSA enrichment
  23. 2026-09-12 15:02 UTCEPSS rescore
  24. 2026-09-12 04:50 UTCGHSA enrichment
  25. 2026-09-11 17:26 UTCEG score recompute
  26. 2026-09-11 17:26 UTCGHSA enrichment
  27. 2026-09-11 14:53 UTCEPSS rescore
  28. 2026-09-11 05:50 UTCGHSA enrichment
  29. 2026-09-10 18:26 UTCEG score recompute
  30. 2026-09-10 18:26 UTCGHSA enrichment
  31. 2026-09-10 09:35 UTCEPSS rescore
  32. 2026-09-10 07:01 UTCGHSA enrichment
  33. 2026-09-09 19:37 UTCGHSA enrichment
  34. 2026-09-09 08:13 UTCEG score recompute
  35. 2026-09-09 08:13 UTCGHSA enrichment
  36. 2026-09-08 22:01 UTCEPSS rescore
  37. 2026-09-08 20:49 UTCGHSA enrichment
  38. 2026-09-08 10:47 UTCGHSA enrichment
  39. 2026-09-07 23:16 UTCEG score recompute
  40. 2026-09-07 23:16 UTCGHSA enrichment
  41. 2026-09-07 11:52 UTCGHSA enrichment
  42. 2026-09-07 00:26 UTCEG score recompute
  43. 2026-09-07 00:26 UTCGHSA enrichment
  44. 2026-09-06 13:48 UTCEPSS rescore
  45. 2026-09-06 13:01 UTCGHSA enrichment
  46. 2026-09-06 01:38 UTCEG score recompute
  47. 2026-09-06 01:38 UTCGHSA enrichment
  48. 2026-09-05 14:14 UTCGHSA enrichment
  49. 2026-09-05 02:51 UTCGHSA enrichment
  50. 2026-09-04 15:26 UTCEG score recompute
  51. 2026-09-04 15:26 UTCGHSA enrichment
  52. 2026-09-04 04:00 UTCEG score recompute
  53. 2026-09-04 04:00 UTCGHSA enrichment
  54. 2026-09-03 16:33 UTCEG score recompute
  55. 2026-09-03 15:46 UTCEG score recompute
  56. 2026-09-03 15:24 UTCEG score recompute
  57. 2026-09-03 15:23 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-71963?
CVE-2026-71963 is a high vulnerability published on September 3, 2026. Hermes Agent 0.18.2 through 0.21.0, fixed in commit f6234d0, contains a remote code execution vulnerability that allows attackers to execute arbitrary OS commands by supplying a malicious repository with a crafted .git/config that sets core.fsmonitor to an attacker-controlled command. When a user…
When was CVE-2026-71963 disclosed?
CVE-2026-71963 was first published in the National Vulnerability Database on September 3, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-71963 actively exploited?
CVE-2026-71963 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 43.4% of all scored CVEs.
What is the CVSS score of CVE-2026-71963?
CVE-2026-71963 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-71963?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-71963, 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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