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

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Summary

CVECVE-2026-44373
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-13 21:16:48 UTC
Updated2026-05-14 16:57:26 UTC
DescriptionNitro 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.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

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

EPSS: 0.000430000 probability, percentile 0.133010000 (date 2026-05-14)

Problem Types: CWE-22 | CWE-22 CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Nitrojs Nitro affected < 3.0.260429-beta Not specified
CNA Nitrojs Nitropack affected < 2.13.4 Not specified

References

ReferenceSourceLinkTags
github.com/nitrojs/nitro/pull/4222 [email protected] github.com
github.com/nitrojs/nitro/security/advisories/GHSA-5w89-w975-hf9q [email protected] github.com
github.com/nitrojs/nitro/releases/tag/v3.0.260429-beta [email protected] github.com
github.com/nitrojs/nitro/pull/4223 [email protected] github.com
github.com/nitrojs/nitro/releases/tag/v2.13.4 [email protected] github.com
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