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Sunday, 13 September 2026
8 agent hacks today▲ 7 vs yesterday (1)
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Incident database

CVE-2026-34451: Path validation flaw in Anthropic TypeScript SDK memory tool

The local filesystem memory tool in the Anthropic Claude SDK for TypeScript (versions 0.79.0 to before 0.81.0) validated model-supplied paths with a string prefix check lacking a trailing path separator, so a model steered by prompt injection could read and write files in sibling directories outside the sandboxed memory root. The issue was patched in version 0.81.0.

Disclosed 31 March 2026 · Record updated 13 September 2026

Impact

A prompt-injected model could escape the sandboxed memory directory and read or write files in sibling directories sharing the memory root's name prefix.

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-34451
  2. afterpack.devhttps://afterpack.dev/blog/claude-code-source-leak