CVE-2026-41686: Claude SDK for TypeScript provides access to the Claude API from server-side TypeScript or JavaScript applicat

Routine

MEDIUM 4.4UPGRADE

CVE-2026-41686 is a medium-severity flaw (CVSS 4.4) affecting claude sdk for typescript. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 permissi

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.4 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 98%)
CISA exploited list	No
Weakness	CWE-732
Published	2026-05-04
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: anthropic

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-04 19:16 UTCPublished CVE record published
2026-10-26 19:10 UTCUpdated Record last modified

anthropic claude sdk for typescript UPGRADE

Affected: >= 0.79.0 and < 0.91.1

Fixed in: 0.91.1

Safe to downgrade to: a release before 0.79.0

1. Check installed version

apt-cache policy claude-sdk-for-typescript || rpm -q claude-sdk-for-typescript || claude-sdk-for-typescript --version

2. UPGRADE to 0.91.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade claude-sdk-for-typescript

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade claude-sdk-for-typescript

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 0.79.0 (Debian / Ubuntu)

apt-cache madison claude-sdk-for-typescript sudo apt install claude-sdk-for-typescript=<VERSION_BEFORE_0.79.0> sudo apt-mark hold claude-sdk-for-typescript

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list claude-sdk-for-typescript sudo dnf downgrade claude-sdk-for-typescript-<VERSION_BEFORE_0.79.0> sudo dnf versionlock add claude-sdk-for-typescript

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-41686?

claude sdk for typescript: upgrade to 0.91.1. Exact commands for each OS are on this page.

Is CVE-2026-41686 being exploited?

CVE-2026-41686 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-41686 affect?

CVE-2026-41686 affects claude sdk for typescript. Severity is medium (CVSS 4.4). 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 memo

How urgent is CVE-2026-41686?

Priority 16/100. No elevated risk signals yet.

Software pages

Node.js vulnerabilities

References

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