CVE-2026-44372: Nitro: Open Redirect via Protocol-Relative URL Bypass in Wildcard Route Rules

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-13 · updated 2026-10-26
Weakness: CWE-601

Description

Nitro is a next generation server toolkit. Prior to 3.0.260429-beta, an attacker could turn a redirect route rule using wildcards rewrite into a cross-host redirect by sliding an extra slash in after the rule prefix. This vulnerability is fixed in 3.0.260429-beta.

Affected products

nitrojs nitro: before 2.13.4; from 2.13.4 (excl.) before 3.0.260429 — fixed in 2.13.4, 3.0.260429

How to fix

Upgrade to a fixed version: nitrojs nitro 2.13.4, 3.0.260429. Check the vendor advisory for mitigations.

References

https://github.com/nitrojs/nitro/pull/4236
https://github.com/nitrojs/nitro/releases/tag/v2.13.4
https://github.com/nitrojs/nitro/releases/tag/v3.0.260429-beta
https://github.com/nitrojs/nitro/security/advisories/GHSA-9phm-9p8f-hw5m

Get alerted when CVE-2026-44372 or the next vulnerability affects your stack