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CVE-2026-34450

Claude SDK for Python: Insecure Default File Permissions in Local Filesystem Memory Tool

Published: Mar 31, 2026Updated: Apr 13, 2026 Sources: CVE List NVDCWE-276
NVD MITRE
4.4CVSSMEDIUM
EPSS Score
0.1%
Top 97.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:LAC:LPR:LUI:NS:UC:LI:LA:N
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-276CWE-732

Affected Products

anthropic-sdk-pythonanthropics
SaaS
AI / ML / llm-serving-inference
claude sdk for pythonanthropic
SaaS
AI / ML / llm-serving-inference
anthropicscommercialUSAI / MLaka claude-code, anthropic-sdk-python, anthropic-sdk-typescript
anthropiccommercialUSAI / MLaka claude

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Privilege Escalation
View detailed technique mapping

References

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

Timeline

Published
Mar 31, 2026
Last Updated
Apr 13, 2026

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