CVE-2025-3864
Hackney fails to properly release HTTP connections to the pool
EPSS 0.30%
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.
How to fix CVE-2025-3864
To remediate CVE-2025-3864, upgrade the affected package to a fixed version below.
- Hex/hackney—upgrade to 1.24.0 or later
Is CVE-2025-3864 being exploited?
Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 1.24.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | 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 |