CVE-2026-44373

MEDIUM

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

Title source: cna
STIX 2.1

Description

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.

References (5)

Core 5
Core References
X_Refsource_Misc x_refsource_misc
https://github.com/nitrojs/nitro/pull/4222
X_Refsource_Misc x_refsource_misc
https://github.com/nitrojs/nitro/pull/4223
X_Refsource_Misc x_refsource_misc
https://github.com/nitrojs/nitro/releases/tag/v2.13.4

Scores

CVSS v3 5.3
EPSS 0.0006
EPSS Percentile 17.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-22
Status published
Products (4)
nitrojs/nitro < 3.0.260429-beta
nitrojs/nitropack < 2.13.4
npm/nitro 0 - 3.0.260429-betanpm
npm/nitropack 0 - 2.13.4npm
Published May 13, 2026
Tracked Since May 14, 2026