vulntracker.iovulntracker.io
© 2026 vulntracker.io

CVE-2025-3864

Connection pool exhaustion in hackney

LOW
2.3
CVSS Score
Published: May 28, 2025 at 11:19 AM UTC
Updated: June 17, 2026 at 09:20 AM UTC
2 products affected across 2 vendorsHackneyHackney

Using hackney by hackney?

Get instant alerts when new vulnerabilities affect hackney - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Start FreeSign In
Severity
LOW2.3
Exploit prediction
EPSS 0.9%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Hackney· Benoitchex
85%
All versions
Hackney· Hackney
60%
v < 1.24.0
Affected range stops below 1.24.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

Third Party Advisory
Source: [email protected]
https://cert.pl/en/posts/2025/05/CVE-2025-3864/
Issue Tracking
Source: [email protected]
https://github.com/benoitc/hackney/issues/717
Patch
Source: cverecord
https://github.com/benoitc/hackney/commit/8f13ddac50d1626f8b9a47a08bd599e4efe1773d

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

2.3LOWCERT-PL
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-772

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create accountSign in
Free plan, no card