Incorrect Permission Assignment for Critical Resource Affecting @anthropic-ai/sdk package, versions >=0.79.0 <0.91.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published30 Apr 2026
- disclosed29 Apr 2026
- creditlucasfutures
Introduced: 29 Apr 2026
NewCVE-2026-41686 (opens in a new tab)How to fix?
Upgrade @anthropic-ai/sdk to version 0.91.1 or higher.
Overview
@anthropic-ai/sdk is a The official TypeScript library for the Anthropic API
Affected versions of this package are vulnerable to Incorrect Permission Assignment for Critical Resource in the BetaLocalFilesystemMemoryTool that creates memory files and directories using the Node.js default modes (0o666 for files, 0o777 for directories). An attacker can access persisted agent state. In environments with a permissive umask (e.g. Docker, where umask is often
0o000) the attacker can modify sensitive memory files to influence subsequent model behavior.