How severe is CVE-2026-25725?

CVE-2026-25725 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-25725 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-25725?

CVE-2026-25725 affects Anthropic Claude Code. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-25725?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-25725 have an EU (EUVD) identifier?

Yes. CVE-2026-25725 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5616.

When was CVE-2026-25725 published?

CVE-2026-25725 was published on 2026-02-06 and last updated on 2026-06-17.

CVE-2026-25725

CVE-2026-25725 is a critical-severity vulnerability in Anthropic Claude Code with a CVSS 3.x base score of 10.0. 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-501.

Key facts

Severity: Critical (CVSS 3.x base score 10.0)
CVSS v4: 7.7
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-5616
Weakness: CWE-501
Affected product: Anthropic Claude Code
Published: 2026-02-06
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-25725?: 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.
How severe is CVE-2026-25725?: CVE-2026-25725 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-25725 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-25725?: CVE-2026-25725 affects Anthropic Claude Code. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-25725?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-25725 have an EU (EUVD) identifier?: Yes. CVE-2026-25725 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5616.
When was CVE-2026-25725 published?: CVE-2026-25725 was published on 2026-02-06 and last updated on 2026-06-17.

References

https://github.com/anthropics/claude-code/security/advisories/GHSA-ff64-7w26-62rf

Affected products (1)

cpe:2.3:a:anthropic:claude_code:*:*:*:*:*:node.js:*:*

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