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CVE-2026-1525 is a critical severity vulnerability with a CVSS score of 9.8. No known exploits currently, and patches are available.
Very low probability of exploitation
EPSS predicts the probability of exploitation in the next 30 days based on real-world threat data, complementing CVSS severity scores with actual risk assessment.
Undici allows duplicate HTTP Content-Length headers when they are provided in an array with case-variant names (e.g., Content-Length and content-length). This produces malformed HTTP/1.1 requests with multiple conflicting Content-Length values on the wire.
Who is impacted:
undici.request(), undici.Client, or similar low-level APIs with headers passed as flat arraysPotential consequences:
Content-Length headers (400 Bad Request)Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later.
If upgrading is not immediately possible:
Content-Length headers (case-insensitive) are present before passing headers to undici{ 'content-length': '123' }) rather than an array, which naturally deduplicates by key| Vendor | Product |
|---|---|
| Node.js | Undici |
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