CVE-2026-4276
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 · uneditedLibreChat RAG API, version 0.7.0, contains a log-injection vulnerability that allows attackers to forge log entries.
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 · moderate confidenceLibreChat RAG API version 0.7.0 contains a log-injection vulnerability that allows attackers to inject crafted content into log files through unsanitized user input, enabling log entry forgery. This could allow attackers to obscure their activities, impersonate users, or corrupt log-based monitoring and forensic analysis.
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= 0.7.0CVSS 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
- None
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
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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Identify installed LibreChat versionRun 'npm list librechat' or check package.json version field, or look for version indicator in the application startup logsAffected if version is exactly 0.7.0
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Determine if RAG API is in useCheck if RAG API endpoints are accessible or configured in the LibreChat setup; look for RAG-related configuration in environment variables or config filesAffected if RAG API functionality is enabled or accessible in the environment
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Review application logs for suspicious contentExamine LibreChat log files (typically in logs/ directory or stdout output) for entries containing unexpected newlines, carriage returns, or formatting that does not match the expected log patternAffected if logs contain entries with injected content such as fake authentication events, unusual timestamps, or malformed patterns that suggest user input was written directly to logs without sanitization
A user is affected if they are running LibreChat version 0.7.0 with the RAG API enabled, as this specific version contains the unsanitized user input in the RAG API logging component.
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.
From vendor dataImplement strict input validation and proper escaping/encoding of all user-supplied data before writing to logs; consider using structured logging libraries that automatically handle injection prevention.
- Consultation2.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-4276 — 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-2026-4276 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