CVSS 4.0
5.8 mediumCVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:NCVE-2026-34452
Medium (5.8) in anthropic claude sdk for python. EPSS 0.1% chance of exploitation in the next 30 days. Fixed in anthropic 0.87.0.
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.
Severity
CVSS 3.1
5.3 mediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N- EPSS
- 0.1% chance of exploitation in the next 30 days; higher than 3% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-59, CWE-367
- Published
- Modified
- Record from
- the NVD, synced
Affected
- anthropic:claude_sdk_for_python
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-w828-4qhx-vxx3 | PyPI | anthropic | >=0.86.0 <0.87.0 | 0.87.0 |
| PYSEC-2026-2115 | PyPI | anthropic | >=0.86.0 <0.87.0 | 0.87.0 |