medium5.4
CVE-2026-34451
Claude SDK for TypeScript provides access to the Claude API from server-side TypeScript or JavaScript applications.
Impact
Claude SDK for TypeScript provides access to the Claude API from server-side TypeScript or JavaScript applications. From version 0.79.0 to before version 0.81.0, the local filesystem memory tool in the Anthropic TypeScript SDK validated model-supplied paths using a string prefix check that did not append a trailing path separator. A model steered by prompt injection could supply a crafted path that resolved to a sibling directory sharing the memory root's name as a prefix, allowing reads and writes outside the sandboxed memory directory. This issue has been patched in version 0.81.0.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | @anthropic-ai/sdk | >= 0.79.0, < 0.81.0 | 0.81.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Anthropic | Claude Sdk For Typescript | from 0.79.0 before 0.81.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/anthropics/anthropic-sdk-typescript/commit/0ac69b3438ee9c96b21a7d3c39c07b7cdb6995d9
- https://github.com/anthropics/anthropic-sdk-typescript/releases/tag/sdk-v0.81.0
- https://github.com/anthropics/anthropic-sdk-typescript/security/advisories/GHSA-5474-4w2j-mq4c
- https://github.com/advisories/GHSA-5474-4w2j-mq4c
- https://nvd.nist.gov/vuln/detail/CVE-2026-34451