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CVE-2026-44373

24
FAUCET Score

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.

First published: May 13, 2026Last modified: May 13, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 2.13.4CPE matchmatch criteria
cpe:2.3:a:nitro:nitro:*:*:*:*:*:node.js:*:*
> 2.13.4, < 3.0.260429CPE matchmatch criteria
cpe:2.3:a:nitro:nitro:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.39%
Probability of exploitation in next 30 days
EPSS Percentile
31.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0039 is in the 20th percentile among its peer group of 23,725 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: nitroFixed in: 3.0.260429-beta
npmpatch availablevia ghsa
Product: nitropackFixed in: 2.13.4

Vendor Advisories (1)

npmGHSA-5w89-w975-hf9qmedium

Nitro has a proxy scope bypass via percent-encoded path traversal in `routeRules`

May 6, 2026

References

github.com / nitrojs/nitro/pull/4222
Issue TrackingPatch
github.com / nitrojs/nitro/pull/4223
Issue TrackingPatch
github.com / nitrojs/nitro/releases/tag/v2.13.4
Release Notes
github.com / nitrojs/nitro/releases/tag/v3.0.260429-beta
Release Notes
github.com / nitrojs/nitro/security/advisories/GHSA-5w89-w975-hf9q
Third Party Advisory