CVE-2026-25725Network attack vector

Host code execution via unprotected settings creation

Published Feb 6, 2026 · Updated Feb 6, 2026

Sandbox escape in Anthropic Claude Code before 2.1.2 allows remote attackers to execute persistent hooks with host privileges. Bubblewrap leaves .claude/settings.json creatable when it is absent at startup because the writable parent directory is mounted without a read-only constraint for that missing file. Exploitation requires sandboxed malicious code, an absent file at startup, and a later Claude Code restart; injected commands then run outside the sandbox.

CVSS severity7.7
High
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sandbox escape in Anthropic Claude Code before 2.1.2 allows remote attackers to execute persistent hooks with host privileges. Bubblewrap leaves .claude/settings.json creatable when it is absent at startup because the writable parent directory is mounted without a read-only constraint for that missing file. Exploitation requires sandboxed malicious code, an absent file at startup, and a later Claude Code restart; injected commands then run outside the sandbox.

The record

CVE
CVE-2026-25725
Published
Feb 6, 2026
Updated
Feb 6, 2026
Vendor
Anthropic
Product
Claude Code
Classifications
CWE-501, CWE-668, T1546
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Anthropic · Claude Codeversion=< 2.1.2

Published CVSS scores

7.7GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
10.0NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-501Trust Boundary Violation
CWE-668Exposure of Resource to Wrong Sphere
T1546Event Triggered Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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