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…
Exact source revision recorded 30 Oct 2026 07:00:26 UTC. It does not establish the source's current position. Latest evidence.
euvd · EUVD-2026-29722
Publishedssrfcheck 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.
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Original publisher date fields
datePublished: May 12, 2026, 5:49:12 PM
dateUpdated: May 13, 2026, 2:37:49 PM
- Source published
- May 12, 2026, 5:49:12 PM (timezone not stated)
- Source modified
- May 13, 2026, 2:37:49 PM (timezone not stated)
- Observed here
- 30 Oct 2026 07:00:26 UTC
- Source terms
- ENISA EUVD · source terms and attribution apply
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EUVD CVSS 3.1 · 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N