CVE-2025-62595

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    CVE-2025-62595

    Published: 21 Oct 2025Last Modified: 10 Oct 2026

    Summary: Koa Vulnerable to Open Redirect via Trailing Double-Slash (//) in back Redirect Logic

    Details: Koa is expressive middleware for Node.js using ES2017 async functions. In versions 2.16.2 to before 2.16.3 and 3.0.1 to before 3.0.3, a bypass to CVE-2025-8129 was discovered in the Koa.js framework affecting its back redirect functionality. In certain circumstances, an attacker can manipulate the Referer header to force a user’s browser to navigate to an external, potentially malicious website. This occurs because the implementation incorrectly treats some specially crafted URLs as safe relative paths. Exploiting this vulnerability could allow attackers to perform phishing, social engineering, or other redirect-based attacks on users of affected applications. This issue has been patched in version 3.0.3.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/62xxx/CVE-2025-62595.json, https://github.com/koajs/koa/security/advisories/GHSA-g8mr-fgfg-5qpc, https://nvd.nist.gov/vuln/detail/CVE-2025-62595, https://github.com/koajs/koa/commit/769fd75cc6b30d72493b370b5a3ae2332ca03c5b

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 1ddb048adce65fdf11402cc19d7b8eae4e176f78
    Fixed -ffd497a1903ff4df54f14b3d1763813d5c7d10fc

    Affected versions

    2.16.2

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2025-62595 | CVE-DB