CVSS 4.0
6.3 mediumCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:NCVE-2026-34451
Medium (6.3) in anthropic claude sdk for typescript. EPSS 0.4% chance of exploitation in the next 30 days. Fixed in @anthropic-ai/sdk 0.81.0.
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.
Severity
CVSS 3.1
5.4 mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 30% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-22, CWE-41
- Published
- Modified
- Record from
- the NVD, synced
Affected
- anthropic:claude_sdk_for_typescript
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-5474-4w2j-mq4c | npm | @anthropic-ai/sdk | >=0.79.0 <0.81.0 | 0.81.0 |