CVE-2026-34450

MEDIUM EPSS 2.3%
Published Mar 31, 20263mo ago · Modified Jun 17, 20262w ago
4.8 CVSS 4.0
Medium
Find Similar
Published Mar 31, 2026 3mo ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
4.8
Exploitability
—
Impact
—
Vector string
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
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
2.3% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 2

CWE-276
CWE-732

Affected Products 1

VendorProductVersionRange
anthropicclaude_sdk_for_python*≥0.86.0  –  <0.87.0

References 3

  • github.com https://github.com/anthropics/anthropic-sdk-python/commit/715030ceb4d6dd8d3546e999c680e29532bf1255
    Patch
  • github.com https://github.com/anthropics/anthropic-sdk-python/releases/tag/v0.87.0
    Release Notes
  • github.com https://github.com/anthropics/anthropic-sdk-python/security/advisories/GHSA-q5f5-3gjm-7mfm
    Vendor Advisory

Remediation

  • github.com https://github.com/anthropics/anthropic-sdk-python/commit/715030ceb4d6dd8d3546e999c680e29532bf1255
    Patch