Vulnerability-Lookup

CVE-2026-34451 (GCVE-0-2026-34451)

Vulnerability from cvelistv5 – Published: 2026-03-31 21:35 – Updated: 2026-04-01 18:57

Title

Claude SDK for TypeScript: Memory Tool Path Validation Allows Sandbox Escape to Sibling Directories

Summary

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

6.3 (Medium)


                        
                          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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

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

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/anthropics/anthropic-sdk-types…	x_refsource_CONFIRM
https://github.com/anthropics/anthropic-sdk-types…	x_refsource_MISC
https://github.com/anthropics/anthropic-sdk-types…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
anthropics	anthropic-sdk-typescript	Affected: >= 0.79.0, < 0.81.0

Show details on NVD website

JSON

To clipboard

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      "title": "Claude SDK for TypeScript: Memory Tool Path Validation Allows Sandbox Escape to Sibling Directories"
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}

FKIE_CVE-2026-34451

Vulnerability from fkie_nvd - Published: 2026-03-31 22:16 - Updated: 2026-06-17 10:39

Severity

5.4 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/anthropics/anthropic-sdk-typescript/commit/0ac69b3438ee9c96b21a7d3c39c07b7cdb6995d9	Patch
security-advisories@github.com	https://github.com/anthropics/anthropic-sdk-typescript/releases/tag/sdk-v0.81.0	Release Notes
security-advisories@github.com	https://github.com/anthropics/anthropic-sdk-typescript/security/advisories/GHSA-5474-4w2j-mq4c	Vendor Advisory

Impacted products

	Vendor	Product	Version
	anthropic	claude_sdk_for_typescript	*

JSON

To clipboard

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          "product": "anthropic-sdk-typescript",
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          "versions": [
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    }
  ],
  "id": "CVE-2026-34451",
  "lastModified": "2026-06-17T10:39:04.347",
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          "confidentialityImpact": "LOW",
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        "Release Notes"
      ],
      "url": "https://github.com/anthropics/anthropic-sdk-typescript/releases/tag/sdk-v0.81.0"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/anthropics/anthropic-sdk-typescript/security/advisories/GHSA-5474-4w2j-mq4c"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        },
        {
          "lang": "en",
          "value": "CWE-41"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-5474-4W2J-MQ4C

Vulnerability from github – Published: 2026-04-01 21:16 – Updated: 2026-04-24 20:59

Summary

Claude SDK for TypeScript: Memory Tool Path Validation Allows Sandbox Escape to Sibling Directories

Details

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.

Users on the affected versions are advised to update to the latest version.

Claude SDK for TypeScript thanks hackerone.com/nicksim for reporting this issue!

Severity

5.4 (Medium)


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

6.3 (Medium)


                  
                    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

Show details on source website

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@anthropic-ai/sdk"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.79.0"
            },
            {
              "fixed": "0.81.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-34451"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22",
      "CWE-41"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-01T21:16:49Z",
    "nvd_published_at": "2026-03-31T22:16:20Z",
    "severity": "MODERATE"
  },
  "details": "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\u0027s name as a prefix, allowing reads and writes outside the sandboxed memory directory.\n\nUsers on the affected versions are advised to update to the latest version.\n\nClaude SDK for TypeScript thanks [hackerone.com/nicksim](https://hackerone.com/nicksim) for reporting this issue!",
  "id": "GHSA-5474-4w2j-mq4c",
  "modified": "2026-04-24T20:59:12Z",
  "published": "2026-04-01T21:16:49Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/anthropics/anthropic-sdk-typescript/security/advisories/GHSA-5474-4w2j-mq4c"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34451"
    },
    {
      "type": "WEB",
      "url": "https://github.com/anthropics/anthropic-sdk-typescript/commit/0ac69b3438ee9c96b21a7d3c39c07b7cdb6995d9"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/anthropics/anthropic-sdk-typescript"
    },
    {
      "type": "WEB",
      "url": "https://github.com/anthropics/anthropic-sdk-typescript/releases/tag/sdk-v0.81.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Claude SDK for TypeScript: Memory Tool Path Validation Allows Sandbox Escape to Sibling Directories"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-34451 (GCVE-0-2026-34451)

FKIE_CVE-2026-34451

GHSA-5474-4W2J-MQ4C

Tags

Sightings

Nomenclature