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CVE-2026-34452

Claude SDK for Python: Memory Tool Path Validation Race Condition Allows Sandbox Escape

Published: Mar 31, 2026Updated: Apr 20, 2026 Sources: CVE List NVDCWE-59
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.1%
Top 96.5%
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 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.

CVSS Vector Breakdown

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

CWE-59CWE-367

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

3 techniques
Collection
Discovery
Privilege Escalation
View detailed technique mapping

References

https://github.com/anthropics/anthropic-sdk-python/security/advisories/GHSA-w828-4qhx-vxx3
github.com
https://github.com/anthropics/anthropic-sdk-python/commit/6599043eee6e86dce16953fcd1fd828052052be6
github.com
https://github.com/anthropics/anthropic-sdk-python/releases/tag/v0.87.0
github.com

Timeline

Published
Mar 31, 2026
Last Updated
Apr 20, 2026

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