CVE-2025-3864

Connection pool exhaustion in hackney

Published May 28, 2025 CVSS 4.0 · 2.3 Low EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2025-16328 Hackney fails to properly release HTTP connections to the pool
Github GHSA Github GHSA GHSA-9fm9-hp7p-53mf Hackney fails to properly release HTTP connections to the pool
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Connection pool exhaustion in hackney
Weaknesses CWE-772
References
Metrics cvssV4_0

{'score': 2.3, 'vector': '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'}

Subscriptions

No data.

Weaknesses

Sources

Status
PUBLISHED
Assigner
CERT-PL
Published
Updated
Jan 26, 2026, 12:13 PM
Reserved
Apr 22, 2025, 8:43 AM
Status
Deferred
Published
May 28, 2025, 12:15 PM
Modified
Jun 17, 2026, 9:20 AM