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CVE-2025-65099

Anthropic Claude Code code injection

9.8 CRITICALEPSS 0.51%
  1. Published19 Nov 2025

Description

Claude Code is an agentic coding tool. Prior to version 1.0.39, when running on a machine with Yarn 3.0 or above, Claude Code could have been tricked to execute code contained in a project via yarn plugins before the user accepted the startup trust dialog. Exploiting this would have required a user to start Claude Code in an untrusted directory and to be using Yarn 3.0 or above. This issue has been patched in version 1.0.39.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Anthropic Claude Code< 1.0.39

Remediation

Fixed in
Anthropic Claude Code≥ 1.0.39

References

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Frequently asked

Is CVE-2025-65099 being actively exploited?

CVE-2025-65099 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.51%.

How severe is CVE-2025-65099?

CVE-2025-65099 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.51% probability of exploitation.

Which products are affected by CVE-2025-65099?

Affected products include Anthropic Claude Code.

How do I fix CVE-2025-65099?

Upgrade affected software to a fixed version, for example Anthropic Claude Code 1.0.39 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-65099 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.