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CVE-2026-25725

Anthropic Claude Code vulnerability

10.0 CRITICALEPSS 0.70%
  1. Published6 Feb 2026

Description

Claude Code is an agentic coding tool. Prior to version 2.1.2, Claude Code's bubblewrap sandboxing mechanism failed to properly protect the .claude/settings.json configuration file when it did not exist at startup. While the parent directory was mounted as writable and .claude/settings.local.json was explicitly protected with read-only constraints, settings.json was not protected if it was missing. This allowed malicious code running inside the sandbox to create this file and inject persistent hooks (such as SessionStart commands) that would execute with host privileges when Claude Code was restarted. This issue has been patched in version 2.1.2.

CVSS 3.1 breakdown

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

Affected products

Anthropic Claude Code< 2.1.2

Remediation

Fixed in
Anthropic Claude Code≥ 2.1.2

References

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Frequently asked

Is CVE-2026-25725 being actively exploited?

CVE-2026-25725 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.70%.

How severe is CVE-2026-25725?

CVE-2026-25725 has a CVSS 3.1 base score of 10.0, rated critical. EPSS estimates a 0.70% probability of exploitation.

Which products are affected by CVE-2026-25725?

Affected products include Anthropic Claude Code.

How do I fix CVE-2026-25725?

Upgrade affected software to a fixed version, for example Anthropic Claude Code 2.1.2 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-25725 against the real software inventory on every managed device, every day. 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.