EUVD-2026-17677
GHSA-q5f5-3gjm-7mfm
CVSS Vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
4Description
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.
Analysis
Anthropic Python SDK versions 0.86.0 to before 0.87.0 create memory files with overly permissive file permissions (0o666), allowing local attackers to read persisted agent state or modify memory files to influence model behavior on shared hosts and Docker environments. The vulnerability affects both synchronous and asynchronous memory tool implementations and has been patched in version 0.87.0; no public exploit code or active exploitation has been identified at the time of analysis.
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