How severe is CVE-2026-34450?

CVE-2026-34450 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-2026-34450 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-2026-34450?

CVE-2026-34450 affects Anthropic Claude Sdk For Python. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34450?

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

Does CVE-2026-34450 have an EU (EUVD) identifier?

Yes. CVE-2026-34450 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17677.

When was CVE-2026-34450 published?

CVE-2026-34450 was published on 2026-03-31 and last updated on 2026-06-17.

CVE-2026-34450

CVE-2026-34450 is a medium-severity vulnerability in Anthropic Claude Sdk For Python 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-276.

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-2026-17677
Weakness: CWE-276
Affected product: Anthropic Claude Sdk For Python
Published: 2026-03-31
Last modified: 2026-06-17

Description

The Claude SDK for Python provides access to the Claude API from Python applications. From version 0.86.0 to before version 0.87.0, 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. This issue has been patched in version 0.87.0.

Frequently asked questions

What is CVE-2026-34450?: The Claude SDK for Python provides access to the Claude API from Python applications. From version 0.86.0 to before version 0.87.0, 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. This issue has been patched in version 0.87.0.
How severe is CVE-2026-34450?: CVE-2026-34450 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-2026-34450 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-2026-34450?: CVE-2026-34450 affects Anthropic Claude Sdk For Python. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34450?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-34450 have an EU (EUVD) identifier?: Yes. CVE-2026-34450 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17677.
When was CVE-2026-34450 published?: CVE-2026-34450 was published on 2026-03-31 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:anthropic:claude_sdk_for_python:*:*:*:*:*:python:*:*

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