CVE-2026-44373: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in nitrojs nitro
CVE-2026-44373 is a medium severity path traversal vulnerability in the Nitro server toolkit prior to version 3.0.260429-beta. An attacker could bypass proxy route rules by sending percent-encoded path traversal sequences in the URL, causing Nitro to forward requests outside the intended scope. This could lead to unauthorized access to resources outside the configured directory. The vulnerability is fixed starting with version 3.0.260429-beta. No known exploits are reported in the wild at this time.
AI Analysis
Technical Summary
Nitro versions before 3.0.260429-beta are vulnerable to a path traversal issue (CWE-22) where percent-encoded sequences like '..%2f' in URLs can bypass proxy route restrictions. This allows an attacker to cause Nitro to forward requests that resolve outside the configured directory scope, potentially exposing unauthorized resources. The vulnerability has a CVSS 3.1 base score of 5.3 (medium severity) with network attack vector, low complexity, no privileges or user interaction required, and limited confidentiality impact. The issue is resolved in Nitro version 3.0.260429-beta.
Potential Impact
An attacker can bypass proxy route rules by using encoded path traversal sequences, causing Nitro to forward requests outside the intended directory scope. This may lead to unauthorized disclosure of files or resources accessible outside the configured proxy boundaries. There is no indication of integrity or availability impact. No known exploits have been reported in the wild.
Mitigation Recommendations
Upgrade Nitro to version 3.0.260429-beta or later where this vulnerability is fixed. Patch status is not explicitly confirmed in vendor advisories, but the description states the issue is fixed starting with 3.0.260429-beta. Until upgrading, consider restricting or validating URL inputs to prevent percent-encoded path traversal sequences if possible.
CVE-2026-44373: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in nitrojs nitro
Description
CVE-2026-44373 is a medium severity path traversal vulnerability in the Nitro server toolkit prior to version 3.0.260429-beta. An attacker could bypass proxy route rules by sending percent-encoded path traversal sequences in the URL, causing Nitro to forward requests outside the intended scope. This could lead to unauthorized access to resources outside the configured directory. The vulnerability is fixed starting with version 3.0.260429-beta. No known exploits are reported in the wild at this time.
CVSS v3.1
Score 5.3medium
Affected software
pkg:github/nitrojs/nitroRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Nitro versions before 3.0.260429-beta are vulnerable to a path traversal issue (CWE-22) where percent-encoded sequences like '..%2f' in URLs can bypass proxy route restrictions. This allows an attacker to cause Nitro to forward requests that resolve outside the configured directory scope, potentially exposing unauthorized resources. The vulnerability has a CVSS 3.1 base score of 5.3 (medium severity) with network attack vector, low complexity, no privileges or user interaction required, and limited confidentiality impact. The issue is resolved in Nitro version 3.0.260429-beta.
Potential Impact
An attacker can bypass proxy route rules by using encoded path traversal sequences, causing Nitro to forward requests outside the intended directory scope. This may lead to unauthorized disclosure of files or resources accessible outside the configured proxy boundaries. There is no indication of integrity or availability impact. No known exploits have been reported in the wild.
Mitigation Recommendations
Upgrade Nitro to version 3.0.260429-beta or later where this vulnerability is fixed. Patch status is not explicitly confirmed in vendor advisories, but the description states the issue is fixed starting with 3.0.260429-beta. Until upgrading, consider restricting or validating URL inputs to prevent percent-encoded path traversal sequences if possible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-05T20:15:20.631Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a04e7d1cbff5d86100a8500
Added to database: 05/13/2026, 21:06:25 UTC
Last enriched: 05/21/2026, 12:22:23 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 78
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