CVE-2025-3864

Connection pool exhaustion in hackney

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.

Category

2.3
CVSS
Severity: Low
CVSS 4.0 •
EPSS 0.20%
Third-Party Advisory cert.pl
Affected: hackney hackney
Published at:
Updated at:

References

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

Frequently Asked Questions

What is the severity of CVE-2025-3864?
CVE-2025-3864 has been scored as a low severity vulnerability.
How to fix CVE-2025-3864?
To fix CVE-2025-3864, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-3864 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-3864 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-3864?
CVE-2025-3864 affects hackney hackney.
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