PT-2026-29380 · Anthropic · Anthropic-Sdk-Python

Published 2026-03-31 · Updated 2026-03-31 · CVE-2026-34452

Mitre

CVSS v4.0

5.8

Medium

AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

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.

Fix

Link Following

Time Of Check To Time Of Use

Weakness Enumeration

CWE-59

CWE-367

Related Identifiers

CVE-2026-34452

Affected Products

Anthropic-Sdk-Python

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-34452 · Security Note
• https://github.com/anthropics/anthropic-sdk-python/security/advisories/GHSA-w828-4qhx-vxx3 · Note
• https://github.com/anthropics/anthropic-sdk-python/releases/tag/v0.87.0 · Note
• https://github.com/anthropics/anthropic-sdk-python/commit/6599043eee6e86dce16953fcd1fd828052052be6 · Note