gcdRadar
archive/Patch now/AIR-2026-0547
closedclosed 1 Apr 2026Patch now2 Disclosed vulnerabilityAI

CVE-2026-34452: Anthropic Claude Python SDK Sandbox Escape

Claude SDK for Python

A path validation race condition in the async local filesystem memory tool of the Claude Python SDK enables sandbox escapes. Affected users are advised to update their SDK packages.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

CVSS
5.8
EPSS
<0.01 · top 97% · 2026-11-13
EPSS scores by FIRST
fix status
Fix status unknown
first report
1 Apr 2026
last update
1 Apr 2026
CVE ids
CVE-2026-34452other records

Timeline · 1

  1. 1 Apr 2026CVE-2026-34452: Claude SDK for Python: Memory Tool Path Validation Race Condition Allows Sandbox Escape

Sources · 1

Advisories and databases

  1. 2026-04-01
    CVE-2026-34452: Claude SDK for Python: Memory Tool Path Validation Race Condition Allows Sandbox Escape
    GitHub Advisory Database · github.com/advisories/GHSA-w828-4qhx-vxx3

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Classification

lane
Patch now
AI role
Attack on AI
categories
Infrastructure vulnerability
severity
2 · Disclosed vulnerability
fix status
Fix status unknown
targets
Anthropic, Framework / tooling
owasp llm top 10
LLM03:2025 Supply Chain
mitre atlas
no technique for these categories
tags
anthropicsandbox-escape
dates
happened 1 Apr 2026 · first reported 1 Apr 2026
origin
GitHub Advisory Database
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
record
confidence 0.95 · created 2026-10-18 07:00Z · updated 2026-10-18 07:00Z

Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned

Copy a brief

This record as a short Markdown brief, for a ticket, a chat or a coding agent.

the brief as text
# CVE-2026-34452: Anthropic Claude Python SDK Sandbox Escape

https://gcdradar.vercel.app/incidents/cve-2026-34452-anthropic-claude-python-sdk-sandbox-escape · AIR-2026-0547 · closed 2026-04-01

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-04-01
- AI role: Attack on AI
- Products: Claude SDK for Python
- CVE ids: CVE-2026-34452
- CVSS: 5.8

## Summary

A path validation race condition in the async local filesystem memory tool of the Claude Python SDK enables sandbox escapes. Affected users are advised to update their SDK packages.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-04-01: CVE-2026-34452: Claude SDK for Python: Memory Tool Path Validation Race Condition Allows Sandbox Escape (https://github.com/advisories/GHSA-w828-4qhx-vxx3)

## Sources

- 2026-04-01 GitHub Advisory Database: CVE-2026-34452: Claude SDK for Python: Memory Tool Path Validation Race Condition Allows Sandbox Escape https://github.com/advisories/GHSA-w828-4qhx-vxx3

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.

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