How severe is GHSA-q5f5-3gjm-7mfm?

No CVSS score has been assigned to GHSA-q5f5-3gjm-7mfm yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-q5f5-3gjm-7mfm?

GHSA-q5f5-3gjm-7mfm affects the following packages: anthropic (PyPI). Ecosystems affected: PyPI.

How do I fix GHSA-q5f5-3gjm-7mfm?

Update anthropic to 0.87.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-q5f5-3gjm-7mfm is resolved across your whole dependency graph.

How do I detect GHSA-q5f5-3gjm-7mfm in my PyPI dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for anthropic, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate GHSA-q5f5-3gjm-7mfm if there is no patch (or I can't update yet)?

Close the privilege gap rather than the entry point: audit which accounts, roles and service identities can reach the affected operation, drop the component to the least privilege it actually needs, and review file and directory permissions created by earlier installs — a default left in place is what makes this reachable.

Is GHSA-q5f5-3gjm-7mfm actively exploited in the wild?

No public exploit code has been indexed for GHSA-q5f5-3gjm-7mfm yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for GHSA-q5f5-3gjm-7mfm?

GHSA-q5f5-3gjm-7mfm has an EPSS (Exploit Prediction Scoring System) score of 0.1%, placing it in the 2th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is GHSA-q5f5-3gjm-7mfm?

GHSA-q5f5-3gjm-7mfm is classified as Incorrect Default Permissions (CWE-276), CWE-732 (CWE-732). These weakness types describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was GHSA-q5f5-3gjm-7mfm published, and has it been updated?

GHSA-q5f5-3gjm-7mfm was published on April 1, 2026 and was last updated on September 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

Claude SDK for Python has Insecure Default File…

Exploitation Status

No confirmed exploitation observed yet

CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-q5f5-3gjm-7mfm.

EPSS Exploitation Probability

via FIRST.org ↗

0.1%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs2th percentile — riskier than 2% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

1 pkg affected

🐍anthropic

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

The local filesystem memory tool in the Anthropic Python SDK created memory files with mode 0o666, 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. Both the synchronous and asynchronous memory tool implementations were affected.

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

Claude SDK for Python thanks lucasfutures on HackerOne for the report.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐍PyPI	`anthropic`	≥ 0.86.0&&< 0.87.0	0.87.0`pip install --upgrade 'anthropic==0.87.0'`

Affected Products

1 product · 1 configurations

Application

claude sdk for pythonanthropic

≥ 0.86.0 && < 0.87.0

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for anthropic, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update anthropic to 0.87.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-q5f5-3gjm-7mfm is resolved across your whole dependency graph.
Workarounds
Close the privilege gap rather than the entry point: audit which accounts, roles and service identities can reach the affected operation, drop the component to the least privilege it actually needs, and review file and directory permissions created by earlier installs — a default left in place is what makes this reachable.

Frequently Asked Questions

The local filesystem memory tool in the Anthropic Python SDK created memory files with mode 0o666, 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. Both the synchronous and asynchronous memory tool implementations were affected. Users on the affected versions are advised to update to the latest version. Claude SDK for Python

O3 Security · Impact-Aware SCA

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Claude SDK for Python has Insecure Default File Permissions in Local Filesystem Memory ToolGHSA-q5f5-3gjm-7mfm