Medium 6.3Published Mar 31, 2026

CVE-2026-34451Claude SDK for TypeScript: Memory Tool Path Validation Allows Sandbox Escape to Sibling Directories

Updated under an hour ago (Oct 26, 2026, 11:10 AM ET)

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It affects anthropics anthropic-sdk-typescript and 1 other product. Add what you run to find out whether that includes you.

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Every CVE for anthropics anthropic-sdk-typescript

Exploited in the last 30 days

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.

CVSS: 6.3 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Weakness (CWE): CWE-22, CWE-41
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Apr 1, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

anthropics anthropic-sdk-typescript anthropics:anthropic_sdk_typescript (from the name)	from 0.79.0, < 0.81.0	CNA record
anthropic claude_sdk_for_typescript anthropic:claude_sdk_for_typescript	from 0.79.0 before 0.81.0	NVD

References

https://github.com/anthropics/anthropic-sdk-typescript/security/advisories/GHSA-5474-4w2j-mq4cx-refsource-confirm, vendor-advisory
https://github.com/anthropics/anthropic-sdk-typescript/commit/0ac69b3438ee9c96b21a7d3c39c07b7cdb6995d9x-refsource-misc, patch
https://github.com/anthropics/anthropic-sdk-typescript/releases/tag/sdk-v0.81.0x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.