Path Traversal in Nitro
CVE-2026-44373
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.006 (45.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.002
Affected products
- Nitro
- Nitrojs Nitro — versions < 3.0.260429-beta
- Nitrojs Nitropack — versions < 2.13.4
Weakness classification (CWE)
References
- github.com/nitrojs/nitro/pull/4222 (Patch, Issue Tracking)
- github.com/nitrojs/nitro/pull/4223 (Patch, Issue Tracking)
- 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)
Frequently asked questions
- What is CVE-2026-44373?
- CVE-2026-44373 is a medium-severity vulnerability in Nitro, classified under Path Traversal. CVSS score: 5.3/10. Published 2026-05-13.
- How severe is CVE-2026-44373?
- Medium severity. CVSS v3 base score is 5.3 out of 10.