GHSA-w828-4qhx-vxx3
Claude SDK for Python: Memory Tool Path Validation Race Condition Allows Sandbox Escape
Packages
Details
As written in the advisory (Markdown source, shown as plain text).
The async local filesystem memory tool in the Anthropic Python SDK validated that model-supplied paths resolved inside the sandboxed memory directory, but then returned the unresolved path for subsequent file operations. A local attacker able to write to the memory directory could retarget a symlink between validation and use, causing reads or writes to escape the sandbox. The synchronous memory tool implementation was not affected.
Users on the affected versions are advised to update to the latest version.
Claude SDK for Python thanks [hackerone.com/kasthelord](https://hackerone.com/kasthelord) for reporting this issue!
References
External links from the advisory. They lead to third-party sites.
- https://github.com/anthropics/anthropic-sdk-python/security/advisories/GHSA-w828-4qhx-vxx3
- https://nvd.nist.gov/vuln/detail/CVE-2026-34452
- https://github.com/anthropics/anthropic-sdk-python/commit/6599043eee6e86dce16953fcd1fd828052052be6
- https://github.com/anthropics/anthropic-sdk-python
- https://github.com/anthropics/anthropic-sdk-python/releases/tag/v0.87.0