CVE-2025-3864

Connection pool exhaustion in hackney

State: Published
Severity: 2.3 Low
Published: May 28, 2025
Updated: Jan 26, 2026
Reserved: Apr 22, 2025

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	2.3 Low	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N	CERT-PL

Weaknesses

CWE-772 Missing Release of Resource after Effective Lifetime

Affected Products

Product	Versions
hackneyhackney	before 1.24.0Affected

References

https://github.com/benoitc/hackney/issues/717issue-tracking
https://cert.pl/en/posts/2025/05/CVE-2025-3864/third-party-advisory
https://github.com/benoitc/hackney/commit/8f13ddac50d1626f8b9a47a08bd599e4efe1773dpatch

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.