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    1 vulnerability by felippe-regazio

    CVE-2026-43929 (GCVE-0-2026-43929)

    Vulnerability from cvelistv5 – Published: 2026-05-12 17:49 – Updated: 2026-05-13 14:37
    VLAI
    Title
    ssrfcheck: Server-Side Request Forgery (SSRF) and Incomplete List of Disallowed Inputs
    Summary
    ssrfcheck is a library that checks if a string contains a potential SSRF attack. In 1.3.0 and earlier, ssrfcheck fails to block Server-Side Request Forgery attacks when the target private IP address is encoded as an IPv4-mapped IPv6 address (e.g. http://[::ffff:127.0.0.1]/). The WHATWG URL parser built into Node.js silently normalizes the IPv4 notation inside the brackets to compressed hex form ([::ffff:7f00:1]) before the library's private-IP regex ever runs. The regex was written to match dot-notation only and therefore never matches any real input — all seven IANA private IPv4 ranges, including the AWS/GCP/Azure metadata address 169.254.169.254, are bypassed. Any application using isSSRFSafeURL() to guard HTTP requests made with user-supplied URLs is fully exposed to SSRF.
    Severity
    8.2 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-184 - Incomplete List of Disallowed Inputs
    • CWE-918 - Server-Side Request Forgery (SSRF)
    Assigner
    References
    Impacted products
    Vendor Product Version
    felippe-regazio ssrfcheck Affected: <= 1.3.0
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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