Server-side Request Forgery (SSRF) Affecting ssrfcheck package, versions <1.4.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-SSRFCHECK-16424745
- published6 May 2026
- disclosed5 May 2026
- credithits313
Introduced: 5 May 2026
NewCVE-2026-43929 (opens in a new tab)How to fix?
Upgrade ssrfcheck to version 1.4.0 or higher.
Overview
Affected versions of this package are vulnerable to Server-side Request Forgery (SSRF) in the isSSRFSafeURL function. An attacker can access internal network resources and sensitive cloud metadata by submitting specially crafted URLs that use IPv4-mapped IPv6 notation, which bypasses the intended IP address validation.