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 local filesystem memory tool in the Anthropic Python SDK created memory files with mode 0o666, leaving them world-readable on systems with a standard umask and world-writable in environments with a permissive umask such as many Docker base images. A local attacker on a shared host could read persisted agent state, and in containerized deployments could modify memory files to influence subsequent model behavior. Both the synchronous and asynchronous memory tool implementations were 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/715030ceb4d6dd8d3546e9Patch
- https://github.com/anthropics/anthropic-sdk-python/releases/tag/v0.87.0Release Notes
- https://github.com/anthropics/anthropic-sdk-python/security/advisories/GHSA-q5f5Vendor Advisory
FAQ
What is CVE-2026-34450?
CVE-2026-34450 is a vulnerability with a CVSS score of 4.4 (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 local filesystem memory tool in the Anthropic Python SDK created...
How severe is CVE-2026-34450?
CVE-2026-34450 has been rated MEDIUM with a CVSS base score of 4.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-34450?
Check the references section above for vendor advisories and patch information. Affected products include: Anthropic Claude Sdk For Python.