CVE-2026-44373: Nitro

Medium severity, CVSS 5.3. EPSS: 0.6% chance of exploitation in the next 30 days.

Nitro is a next generation server toolkit. Prior to 3.0.260429-beta, an attacker could bypass a proxy route rule by sending percent-encoded path traversal (..%2f) in the URL, causing Nitro to forward a request that the upstream resolved outside the configured scope. This vulnerability is fixed in 3.0.260429-beta.

Affected products

• Nitro Nitro: before 2.13.4 (fixed in 2.13.4); after 2.13.4, before 3.0.260429 (fixed in 3.0.260429)

Published 2026-05-13. Last modified 2026-06-17.