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CVE-2026-44373— Nitro: Proxy scope bypass via percent-encoded path traversal in `routeRules`

Quick assessment

Affected
nitrojs nitro
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Nitro是Nitro开源的一个零配置的生产级服务器扩展工具。 Nitro 3.0.260429-beta之前版本存在路径遍历漏洞，该漏洞源于攻击者可通过在URL中发送百分比编码的路径遍历，导致Nitro将请求转发到配置范围之外的上游。

CVSS 5.3 · Medium EPSS 0.57% · P45

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
nitrojs nitro < 3.0.260429-beta affected
nitrojs nitropack < 2.13.4 affected
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I. Basic Information for CVE-2026-44373

Vulnerability Information
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Vulnerability Title
Nitro: Proxy scope bypass via percent-encoded path traversal in `routeRules`
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Nitro 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nitro是Nitro开源的一个零配置的生产级服务器扩展工具。 Nitro 3.0.260429-beta之前版本存在路径遍历漏洞，该漏洞源于攻击者可通过在URL中发送百分比编码的路径遍历，导致Nitro将请求转发到配置范围之外的上游。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
nitrojs nitro < 3.0.260429-beta -
nitrojs nitropack < 2.13.4 -

II. Public POCs for CVE-2026-44373

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III. Intelligence Information for CVE-2026-44373

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Patches & Fixes for CVE-2026-44373 (2)

Vendor Advisories for CVE-2026-44373 (1)

Vendor Pages for CVE-2026-44373 (1)

Other References for CVE-2026-44373 (1)

IV. Related Vulnerabilities

Same product: nitro
Same vendor: nitrojs
Same weakness: CWE-22

V. Comments for CVE-2026-44373

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