CVE-2026-46406

MEDIUMNVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.1 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 96% 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
Trending — 3 sources updated this week
6.1
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.1Exploit: 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 2.1.59 until 2.1.128, the Claude Code /copy command wrote responses to a hardcoded, predictable path (/tmp/claude/response.md) without UID isolation, randomness, or symlink protection. The file was created world-readable (0644) in a world-traversable directory (0755), allowing any local user to read a privileged user's Claude response, which could contain secrets or credentials. Additionally, because the path was static and predictable, a local attacker could pre-create the directory and plant a symlink at the expected file path, causing the privileged process to follow the symlink and overwrite an attacker-chosen file with the response text. Exploiting this required a local unprivileged user on the same system and a privileged user to run the /copy command. This vulnerability is fixed in 2.1.128.

CVSS v3
6.1
EG Score
6.1(medium)
EPSS
4.5%
KEV
Not listed

Published

June 25, 2026

Last Modified

June 30, 2026

Advisory Details (1)

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

Insecure Temporary File in /copy Command Enables Response Disclosure and Symlink-Based File Write · Advisory · anthropics/claude-code · GitHub

https://github.com/anthropics/claude-code/security/advisories/GHSA-4vp2-6q8c-pvq2

Vendor Advisories for CVE-2026-46406(1)

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

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 16× 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. 2026-07-06 20:09 UTCEG score recompute
  2. 2026-07-06 02:23 UTCEPSS rescore
  3. 2026-07-05 19:23 UTCEG score recompute
  4. 2026-07-05 02:30 UTCEPSS rescore
  5. 2026-07-04 18:40 UTCEG score recompute
  6. 2026-07-04 06:31 UTCEPSS rescore
  7. 2026-07-03 17:56 UTCEG score recompute
  8. 2026-07-02 17:11 UTCEG score recompute
  9. 2026-07-01 16:21 UTCEG score recompute▲ 1.70
  10. 2026-07-01 15:07 UTCEPSS rescore
  11. 2026-06-30 23:22 UTCEPSS rescore
  12. 2026-06-30 18:32 UTCNVD updateCVSS v3 → 6.1
  13. 2026-06-30 15:37 UTCEG score recompute
  14. 2026-06-29 14:53 UTCEG score recompute▲ 4.40
  15. 2026-06-29 14:52 UTCMITRE cvelistV5CVSS v3 → 4.4 · CVSS v4 → 4.4
  16. 2026-06-25 17:46 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-46406?
CVE-2026-46406 is a medium vulnerability published on June 25, 2026. Claude Code is an agentic coding tool. From 2.1.59 until 2.1.128, the Claude Code /copy command wrote responses to a hardcoded, predictable path (/tmp/claude/response.md) without UID isolation, randomness, or symlink protection. The file was created world-readable (0644) in a world-traversable…
When was CVE-2026-46406 disclosed?
CVE-2026-46406 was first published in the National Vulnerability Database on June 25, 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-2026-46406 actively exploited?
CVE-2026-46406 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-46406?
CVE-2026-46406 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2026-46406?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-46406, 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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