Vulnerability Description
The Claude SDK for Python provides access to the Claude API from Python applications. From version 0.86.0 to before version 0.87.0, 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. This issue has been patched in version 0.87.0.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Anthropic | Claude Sdk For Python | >= 0.86.0, < 0.87.0 |
Related Weaknesses (CWE)
References
- https://github.com/anthropics/anthropic-sdk-python/commit/6599043eee6e86dce16953Patch
- https://github.com/anthropics/anthropic-sdk-python/releases/tag/v0.87.0Release Notes
- https://github.com/anthropics/anthropic-sdk-python/security/advisories/GHSA-w828Vendor Advisory
FAQ
What is CVE-2026-34452?
CVE-2026-34452 is a vulnerability with a CVSS score of 5.3 (MEDIUM). The Claude SDK for Python provides access to the Claude API from Python applications. From version 0.86.0 to before version 0.87.0, the async local filesystem memory tool in the Anthropic Python SDK v...
How severe is CVE-2026-34452?
CVE-2026-34452 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-34452?
Check the references section above for vendor advisories and patch information. Affected products include: Anthropic Claude Sdk For Python.