{"id":"EUVD-2026-40116","revision":null,"records":[{"revision":"b87f0f617e954217bd6794627b70bbd9","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-46406","aliases":[],"title":"Claude Code: Insecure Temporary File in /copy Command Enables Response Disclosure and Symlink-Based File Write","description":"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. 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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. 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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.\n\nUsers on standard Claude Code auto-update have received this fix already. Users performing manual updates are advised to update to the latest version.\n\nClaude Code thanks hackerone.com/c_h4ck_0 for reporting this issue.","state":0,"publishedAt":"2026-06-25T16:53:00+00:00","modifiedAt":"2026-07-09T05:15:08.5910631+00:00","affected":[{"ecosystem":"npm","name":"@anthropic-ai/claude-code","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"2.1.59"},{"kind":"fixed","version":"2.1.128"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/anthropics/claude-code/security/advisories/GHSA-4vp2-6q8c-pvq2","https://github.com/anthropics/claude-code"],"sourceUrl":"https://github.com/advisories/GHSA-4vp2-6q8c-pvq2","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-4vp2-6q8c-pvq2","identifiers":["GHSA-4vp2-6q8c-pvq2","CVE-2026-46406"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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