gcdRadar
archive/Patch now/AIR-2026-0603
closedclosed 29 Apr 2026Patch now2 Disclosed vulnerabilityAI

CVE-2026-41686: Claude SDK TypeScript Insecure File Permissions

Claude SDK for TypeScript

The BetaLocalFilesystemMemoryTool in Anthropic's TypeScript SDK created memory files and directories with insecure default permissions. This allows local attackers to read persisted agent state or influence subsequent model behavior in containerized environments.

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
4.8
EPSS
<0.01 · top 99% · 2026-11-13
EPSS scores by FIRST
fix status
Fix status unknown
first report
29 Apr 2026
last update
29 Apr 2026
CVE ids
CVE-2026-41686other records

Timeline · 1

  1. 29 Apr 2026CVE-2026-41686: Claude SDK for TypeScript has Insecure Default File Permissions in Local Filesystem Memory Tool

Sources · 1

Advisories and databases

  1. 2026-04-29
    CVE-2026-41686: Claude SDK for TypeScript has Insecure Default File Permissions in Local Filesystem Memory Tool
    GitHub Advisory Database · github.com/advisories/GHSA-p7fg-763f-g4gf

Titles and links belong to their publishers. The summary above is written by gcdRadar in its own words; data is CC BY-SA 4.0.

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
permissionssdk
dates
happened 29 Apr 2026 · first reported 29 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-2026-41686: Claude SDK TypeScript Insecure File Permissions

https://gcdradar.vercel.app/incidents/cve-2026-41686-claude-sdk-typescript-insecure-file-permissio · AIR-2026-0603 · closed 2026-04-29

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-04-29
- AI role: Attack on AI
- Products: Claude SDK for TypeScript
- CVE ids: CVE-2026-41686
- CVSS: 4.8

## Summary

The BetaLocalFilesystemMemoryTool in Anthropic's TypeScript SDK created memory files and directories with insecure default permissions. This allows local attackers to read persisted agent state or influence subsequent model behavior in containerized environments.

## What to do

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

## Latest updates

- 2026-04-29: CVE-2026-41686: Claude SDK for TypeScript has Insecure Default File Permissions in Local Filesystem Memory Tool (https://github.com/advisories/GHSA-p7fg-763f-g4gf)

## Sources

- 2026-04-29 GitHub Advisory Database: CVE-2026-41686: Claude SDK for TypeScript has Insecure Default File Permissions in Local Filesystem Memory Tool https://github.com/advisories/GHSA-p7fg-763f-g4gf

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

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