{"id":"GHSA-4vp2-6q8c-pvq2","summary":"@anthropic-ai/claude-code has an Insecure Temporary File in /copy Command that Enables Response Disclosure and Symlink-Based File Write","details":"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.\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.","aliases":["CVE-2026-46406"],"modified":"2026-07-09T05:15:08.591063132Z","published":"2026-06-25T16:53:00Z","database_specific":{"cwe_ids":["CWE-200","CWE-377","CWE-59"],"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2026-06-25T16:53:00Z","nvd_published_at":null},"references":[{"type":"WEB","url":"https://github.com/anthropics/claude-code/security/advisories/GHSA-4vp2-6q8c-pvq2"},{"type":"PACKAGE","url":"https://github.com/anthropics/claude-code"}],"affected":[{"package":{"name":"@anthropic-ai/claude-code","ecosystem":"npm","purl":"pkg:npm/%40anthropic-ai/claude-code"},"ranges":[{"type":"SEMVER","events":[{"introduced":"2.1.59"},{"fixed":"2.1.128"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-4vp2-6q8c-pvq2/GHSA-4vp2-6q8c-pvq2.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}