CVE•Published 2026-03-31•Modified 2026-07-24•0 articles on news•4 live references•NVD data

CVE-2026-34451Anthropic · Claude_sdk_for_typescript

Vulnerability data via NVD (ingested)

CVSS v3.1

5.4

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

EPSS percentile

Exploit Prediction Scoring System · top 79% of all CVEs

Weaknesses (CWE)

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')CWE-41Improper Resolution of Path Equivalence

Description

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.

Timeline

Published 2026-03-31

Modified 2026-07-24

External references

NVD MITRE Exploit-DB VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-34451

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Anthropic Claude Sdk For Typescript"

All exposed Anthropic Claude Sdk For Typescript instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Claude Sdk For Typescript"

HTTP body or banner mentions "Claude Sdk For Typescript" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-34451