How severe is CVE-2026-41686?

CVE-2026-41686 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-41686 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-41686?

CVE-2026-41686 affects Anthropic Claude Sdk For Typescript. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-41686?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-41686 have an EU (EUVD) identifier?

Yes. CVE-2026-41686 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-27087.

When was CVE-2026-41686 published?

CVE-2026-41686 was published on 2026-05-04 and last updated on 2026-06-17.

CVE-2026-41686

CVE-2026-41686 is a medium-severity vulnerability in Anthropic Claude Sdk For Typescript with a CVSS 3.x base score of 4.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-732.

Key facts

Severity: Medium (CVSS 3.x base score 4.4)
CVSS v4: 4.8
EPSS exploit prediction: 0% (2nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-27087
Weakness: CWE-732
Affected product: Anthropic Claude Sdk For Typescript
Published: 2026-05-04
Last modified: 2026-06-17

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 0.91.1, the BetaLocalFilesystemMemoryTool in the Anthropic TypeScript SDK created memory files and directories using the Node.js default modes (0o666 for files, 0o777 for directories), leaving them world-readable on systems with a standard umask and world-writable in environments with a permissive umask such as many Docker base images. A local attacker on a shared host could read persisted agent state, and in containerized deployments could modify memory files to influence subsequent model behavior. This issue has been patched in version 0.91.1.

Frequently asked questions

What is CVE-2026-41686?: 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 0.91.1, the BetaLocalFilesystemMemoryTool in the Anthropic TypeScript SDK created memory files and directories using the Node.js default modes (0o666 for files, 0o777 for directories), leaving them world-readable on systems with a standard umask and world-writable in environments with a permissive umask such as many Docker base images. A local attacker on a shared host could read persisted agent state, and in containerized deployments could modify memory files to influence subsequent model behavior. This issue has been patched in version 0.91.1.
How severe is CVE-2026-41686?: CVE-2026-41686 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-41686 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-41686?: CVE-2026-41686 affects Anthropic Claude Sdk For Typescript. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-41686?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-41686 have an EU (EUVD) identifier?: Yes. CVE-2026-41686 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-27087.
When was CVE-2026-41686 published?: CVE-2026-41686 was published on 2026-05-04 and last updated on 2026-06-17.

References

https://github.com/anthropics/anthropic-sdk-typescript/security/advisories/GHSA-p7fg-763f-g4gf

Affected products (1)

cpe:2.3:a:anthropic:claude_sdk_for_typescript:*:*:*:*:*:*:*:*

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