CVE-2025-3864: Hackney

Low severity, CVSS 2.3. EPSS: 0.8% chance of exploitation in the next 30 days.

Hackney fails to properly release HTTP connections to the pool after handling 307 Temporary Redirect responses. Remote attackers can exploit this to exhaust connection pools, causing denial of service in applications using the library. Fix for this issue has been included in 1.24.0 release.

Affected products

• Hackney Hackney: before 1.24.0 (fixed in 1.24.0)

Published 2025-05-28. Last modified 2026-06-17.