CVE-2026-44373 PUBLISHED

Nitro: Proxy scope bypass via percent-encoded path traversal in `routeRules`

Assigner: GitHub_M
Reserved: 05.05.2026 Published: 13.05.2026 Updated: 13.05.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS Score: 5.3

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	Low
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	nitrojs
Product	nitro
Versions	Version < 3.0.260429-beta is affected

Vendor	nitrojs
Product	nitropack
Versions	Version < 2.13.4 is affected

References

Problem Types

CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') CWE