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.
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 3
https://github.com/anthropics/anthropic-sdk-python/commit/715030ceb4d6dd8d3546e…
security-advisories@github.com
https://github.com/anthropics/anthropic-sdk-python/releases/tag/v0.87.0
security-advisories@github.com
https://github.com/anthropics/anthropic-sdk-python/security/advisories/GHSA-q5f…
security-advisories@github.com