Medium 5.3Published May 13, 2026

CVE-2026-44373Nitro: Proxy scope bypass via percent-encoded path traversal in `routeRules`

Updated under an hour ago (Oct 28, 2026, 11:10 AM ET)

Does this affect you?

It affects nitrojs nitro and 2 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for nitrojs nitro

Exploited in the last 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.

CVSS: 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness (CWE): CWE-22
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: May 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

nitrojs nitro nitrojs:nitro (from the name)	before 3.0.260429-beta	CNA record
nitrojs nitropack nitrojs:nitropack (from the name)	before 2.13.4	CNA record
nitro nitro nitro:nitro	before 2.13.4; after 2.13.4 before 3.0.260429	NVD

References

References

https://github.com/nitrojs/nitro/security/advisories/GHSA-5w89-w975-hf9q	x-refsource-confirm, third-party-advisory
https://github.com/nitrojs/nitro/pull/4222	x-refsource-misc, issue-tracking, patch
https://github.com/nitrojs/nitro/pull/4223	x-refsource-misc, issue-tracking, patch
https://github.com/nitrojs/nitro/releases/tag/v2.13.4	x-refsource-misc, release-notes
https://github.com/nitrojs/nitro/releases/tag/v3.0.260429-beta	x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.