CVE-2025-3864

2.3 lowEPSS 0.9%

Low (2.3). EPSS 0.9% 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.

Severity

CVSS 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

EPSS: 0.9% chance of exploitation in the next 30 days; higher than 58% of CVEs (scores of 2026-10-31)
CWE: CWE-772
Published: 2025-05-28
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

References

https://cert.pl/en/posts/2025/05/CVE-2025-3864/
https://github.com/benoitc/hackney/commit/8f13ddac50d1626f8b9a47a08bd599e4efe1773d
https://github.com/benoitc/hackney/issues/717

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