What’s Vulnerable › Vulnerabilities

CVE-2025-1211

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-02-11 · updated 2026-06-17
• Weakness: CWE-918

Description

Versions of the package hackney before 1.21.0 are vulnerable to Server-side Request Forgery (SSRF) due to improper parsing of URLs by URI built-in module and hackey. Given the URL http://127.0.0.1?@127.2.2.2/, the URI function will parse and see the host as 127.0.0.1 (which is correct), and hackney will refer the host as 127.2.2.2/. This vulnerability can be exploited when users rely on the URL function for host checking.

Affected products

• hackney: before 1.21.0 — fixed in 1.21.0

How to fix

Upgrade to a fixed version: hackney 1.21.0. Check the vendor advisory for mitigations.

References

• https://gist.github.com/snoopysecurity/996de09ec0cfd0ebdcfdda8ff515deb1
• https://github.com/benoitc/hackney/commit/9594ce58fabd32cd897fc28fae937694515a3d4a
• https://security.snyk.io/vuln/SNYK-HEX-HACKNEY-6516131
• https://www.blackhat.com/docs/us-17/thursday/us-17-Tsai-A-New-Era-Of-SSRF-Exploiting-URL-Parser-In-Trending-Programming-Languages.pdf
• https://gist.github.com/snoopysecurity/996de09ec0cfd0ebdcfdda8ff515deb1

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