https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Thu, 08 Oct 2026 15:49:25 +0000 https://vulnerability.circl.lu/vuln/cve-2026-103435 <p><strong>Affected:</strong> Anthropic @anthropic-ai/claude-code</p> <p>Claude Code validated that a target file path resided within the project working directory at permission-check time, but re-resolved the path at write time without repeating that validation. This time-of-check to time-of-use (TOCTOU) gap allowed an attacker who could write to the workspace to atomically replace a project file with a symlink, causing Claude Code to follow the symlink and write its output to an arbitrary file outside the project sandbox. Exploitation required the ability to win a race condition against the write operation and write access to the shared workspace, enabling a lower-privileged attacker to redirect benign edits to sensitive files (e.g., shell configuration) in a higher-privileged session.</p> <p>Users on standard Claude Code auto-update have received this fix already. Users performing manual updates are advised to update to the latest version.</p> <p>Thank you to hackerone.com/c_h4ck_0 for reporting this issue.</p> <p><strong>Affected:</strong> Anthropic @anthropic-ai/claude-code</p> <p>Claude Code validated that a target file path resided within the project working directory at permission-check time, but re-resolved the path at write time without repeating that validation. This time-of-check to time-of-use (TOCTOU) gap allowed an attacker who could write to the workspace to atomically replace a project file with a symlink, causing Claude Code to follow the symlink and write its output to an arbitrary file outside the project sandbox. Exploitation required the ability to win a race condition against the write operation and write access to the shared workspace, enabling a lower-privileged attacker to redirect benign edits to sensitive files (e.g., shell configuration) in a higher-privileged session.</p> <p>Users on standard Claude Code auto-update have received this fix already. Users performing manual updates are advised to update to the latest version.</p> <p>Thank you to hackerone.com/c_h4ck_0 for reporting this issue.</p> https://vulnerability.circl.lu/vuln/cve-2026-103435