medium5.3
CVE-2026-44373
Nitro has a proxy scope bypass via percent-encoded path traversal in `routeRules`
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | nitro | < 3.0.260429-beta | 3.0.260429-beta |
| npm | nitropack | < 2.13.4 | 2.13.4 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Nitro | Nitro | before 2.13.4 after 2.13.4 before 3.0.260429 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-5w89-w975-hf9q
- https://github.com/nitrojs/nitro/security/advisories/GHSA-5w89-w975-hf9q
- https://github.com/nitrojs/nitro/pull/4222
- https://github.com/nitrojs/nitro/pull/4223
- https://github.com/nitrojs/nitro/releases/tag/v2.13.4
- https://github.com/nitrojs/nitro/releases/tag/v3.0.260429-beta
- https://nvd.nist.gov/vuln/detail/CVE-2026-44373