CVE-2026-44372 Nitro: Open Redirect via Protocol-Relative URL Bypass in Wildcard Route Rules
Attackers can bypass redirect rules to redirect users to malicious external sites via protocol-relative URLs in Nitro server toolkit.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-44372?
CVE-2026-44372 is a medium-severity vulnerability in nitrojs nitro, published on 13 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-601
Which versions are affected by CVE-2026-44372?
4 open source packages ship an affected version, including nitro and nitropack. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
nitro npm | All versions | 3.0.260429-beta |
nitro npm | All versions | 3.0.260429-beta |
nitropack npm | All versions | 2.13.4 |
nitropack npm | All versions | 2.13.4 |
Products include Nitro Nitro.
How do I fix CVE-2026-44372?
Upgrade nitro to 3.0.260429-beta or later.
Is CVE-2026-44372 being exploited?
There is no known exploitation of CVE-2026-44372 in the wild and no public exploit code.
Other vulnerabilities in nitrojs nitro
Sources
Also known as GHSA-9phm-9p8f-hw5m.