CVE-2026-55607

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 0.8%, top 49% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 8.8Exploit: NoneExposed: 0

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

Claude Code is an agentic coding tool. From 2.1.38 until 2.1.163, Claude Code's worktree handling allowed creation of worktrees named ".git" and navigation to worktrees outside the sandbox context, enabling git directory confusion attacks. By exploiting symlink manipulation and git fsmonitor execution during worktree operations, an attacker could overwrite files in the user's home directory (such as .zshenv), leading to code execution outside of seatbelt sandbox restrictions. Reliably exploiting this required the user to clone a malicious repository containing prompt injection content and run Claude Code against it. This vulnerability is fixed in 2.1.163.

CVSS v3
8.8
EG Score
8.8(medium)
EPSS
51.1%
KEV
Not listed

Published

June 29, 2026

Last Modified

June 30, 2026

Advisory Details (1)

Auto-updated Jun 29, 2026
Patch available. Sources: github.
github Patch Available

Sandbox Escape via Git Worktree Path Confusion Allows Unsandboxed Code Execution · Advisory · anthropics/claude-code · GitHub

https://github.com/anthropics/claude-code/security/advisories/GHSA-7835-87q9-rgvv

Weakness Classification(3)

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. 2026-07-13 02:45 UTCEG score recompute
  2. 2026-07-12 15:36 UTCEG score recompute
  3. 2026-07-12 05:46 UTCEPSS rescore
  4. 2026-07-12 04:26 UTCEG score recompute
  5. 2026-07-11 17:15 UTCEG score recompute
  6. 2026-07-11 08:27 UTCEPSS rescore
  7. 2026-07-11 08:27 UTCEPSS rescore
  8. 2026-07-11 06:05 UTCEG score recompute
  9. 2026-07-10 18:54 UTCEG score recompute
  10. 2026-07-10 07:45 UTCEG score recompute
  11. 2026-07-09 20:33 UTCEG score recompute
  12. 2026-07-09 19:10 UTCEPSS rescore
  13. 2026-07-09 19:10 UTCEPSS rescore
  14. 2026-07-09 09:20 UTCEG score recompute
  15. 2026-07-08 22:11 UTCEG score recompute
  16. 2026-07-08 15:16 UTCEPSS rescore
  17. 2026-07-08 15:16 UTCEPSS rescore
  18. 2026-07-08 11:02 UTCEG score recompute
  19. 2026-07-07 23:52 UTCEG score recompute
  20. 2026-07-07 13:46 UTCEPSS rescore
  21. 2026-07-07 13:46 UTCEPSS rescore
  22. 2026-07-07 12:44 UTCEG score recompute
  23. 2026-07-07 01:35 UTCEG score recompute
  24. 2026-07-06 16:27 UTCEPSS rescore
  25. 2026-07-06 16:27 UTCEPSS rescore
Show 26 more
  1. 2026-07-06 14:24 UTCEG score recompute
  2. 2026-07-06 03:14 UTCEG score recompute
  3. 2026-07-06 02:23 UTCEPSS rescore
  4. 2026-07-06 02:23 UTCEPSS rescore
  5. 2026-07-05 15:58 UTCEG score recompute
  6. 2026-07-05 04:49 UTCEG score recompute
  7. 2026-07-05 02:31 UTCEPSS rescore
  8. 2026-07-05 02:30 UTCEPSS rescore
  9. 2026-07-04 17:39 UTCEG score recompute
  10. 2026-07-04 06:31 UTCEPSS rescore
  11. 2026-07-04 06:31 UTCEPSS rescore
  12. 2026-07-04 06:29 UTCEG score recompute
  13. 2026-07-03 19:17 UTCEG score recompute
  14. 2026-07-03 08:08 UTCEG score recompute
  15. 2026-07-02 20:59 UTCEG score recompute
  16. 2026-07-02 09:50 UTCEG score recompute
  17. 2026-07-01 22:41 UTCEG score recompute
  18. 2026-07-01 15:07 UTCEPSS rescore
  19. 2026-07-01 11:33 UTCEG score recompute
  20. 2026-07-01 00:23 UTCEG score recompute▲ 1.10
  21. 2026-06-30 23:22 UTCEPSS rescore
  22. 2026-06-30 16:32 UTCNVD updateCVSS v3 → 8.8
  23. 2026-06-30 13:11 UTCEG score recompute
  24. 2026-06-30 02:01 UTCEG score recompute
  25. 2026-06-29 14:52 UTCEG score recompute
  26. 2026-06-29 14:52 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-55607?
CVE-2026-55607 is a high vulnerability published on June 29, 2026. Claude Code is an agentic coding tool. From 2.1.38 until 2.1.163, Claude Code's worktree handling allowed creation of worktrees named ".git" and navigation to worktrees outside the sandbox context, enabling git directory confusion attacks. By exploiting symlink manipulation and git fsmonitor…
When was CVE-2026-55607 disclosed?
CVE-2026-55607 was first published in the National Vulnerability Database on June 29, 2026, with the most recent update on June 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55607 actively exploited?
CVE-2026-55607 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 51.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-55607?
CVE-2026-55607 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-55607?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55607, 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.

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