CVE-2025-64755
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedClaude Code is an agentic coding tool. Prior to version 2.0.31, due to an error in sed command parsing, it was possible to bypass the Claude Code read-only validation and write to arbitrary files on the host system. This issue has been patched in version 2.0.31.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceClaude Code versions prior to 2.0.31 contain a vulnerability where improper sed command parsing allows attackers to bypass read-only validation, enabling writes to arbitrary filesystem locations. This is a command injection flaw with critical severity (CVSS 9.8).
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 2.0.31CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check installed Claude Code versionRun 'claude --version' or 'claude -v' in your terminal to determine the currently installed version of Claude Code CLIAffected if The version displayed is less than 2.0.31 (for example, 2.0.30, 2.0.29, etc.)
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Identify Claude Code binary locationRun 'which claude' or 'where claude' to locate the Claude Code executable, then run the version command on that binary directly if neededAffected if The binary reports a version prior to 2.0.31
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Verify if read-only mode is intended for your Claude Code usageReview your Claude Code configuration, environment variables, or startup flags for read-only enforcement settings (such as --read-only or similar restrictions)Affected if Read-only mode restrictions are configured and the Claude Code version is below 2.0.31, making the bypass applicable
You are affected if Claude Code version is below 2.0.31 and you rely on read-only validation to prevent arbitrary file writes through sed command processing.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped2.0.31
Upgrade Claude Code to version 2.0.31 or later to apply the patch for this vulnerability.
Claude Code 2.0.31
- Check current Claude Code version using 'claude --version' or similar command
- Download Claude Code version 2.0.31 or later from the official GitHub repository
- Install the updated version following standard installation procedures
- Verify the installation was successful by checking the version number
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation1.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,696.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-64755 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-64755 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data