CVE-2026-1525 Affecting nodejs:22/nodejs package, versions <1:22.22.2-1.module_el8.10.0+4158+e796f37f


Severity

Recommended
high

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.02% (5th percentile)

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  • Snyk IDSNYK-ALMALINUX8-NODEJS-16089084
  • published16 Apr 2026
  • disclosed9 Apr 2026

Introduced: 9 Apr 2026

NewCVE-2026-1525  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:8 nodejs:22/nodejs to version 1:22.22.2-1.module_el8.10.0+4158+e796f37f or higher.
This issue was patched in ALSA-2026:7123.

NVD Description

Note: Versions mentioned in the description apply only to the upstream nodejs:22/nodejs package and not the nodejs:22/nodejs package as distributed by AlmaLinux. See How to fix? for AlmaLinux:8 relevant fixed versions and status.

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:

  • Applications using undici.request(), undici.Client, or similar low-level APIs with headers passed as flat arrays
  • Applications that accept user-controlled header names without case-normalization

Potential consequences:

  • Denial of Service: Strict HTTP parsers (proxies, servers) will reject requests with duplicate Content-Length headers (400 Bad Request)
  • HTTP Request Smuggling: In deployments where an intermediary and backend interpret duplicate headers inconsistently (e.g., one uses the first value, the other uses the last), this can enable request smuggling attacks leading to ACL bypass, cache poisoning, or credential hijacking

CVSS Base Scores

version 3.1