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CVE-2025-3864

13
FAUCET Score

CVE-2025-3864 describes a denial-of-service vulnerability in the Hackney library, where HTTP connections are not properly released to the pool after 307 Temporary Redirect responses. This flaw allows remote attackers to exhaust connection pools in applications utilizing Hackney, leading to service disruption. The vulnerability has a low CVSS score of 2.3, indicating a network-based attack with low attack complexity, requiring user interaction, and resulting in low availability impact. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
HackneyHackney
>= 0, < 1.24.0CNA affecteddefault unknown

CVSS Data

CVSS version used by this source: 4.0

2.3LOW

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
PASSIVE
VS Confidentiality
NONE
VS Integrity
NONE
VS Availability
LOW
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.73%
Probability of exploitation in next 30 days
EPSS Percentile
50.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0073 is in the 93rd percentile among its peer group of 43 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

erlangpatch availablevia ghsa
Product: hackneyFixed in: 1.24.0

Vendor Advisories (1)

erlangGHSA-9fm9-hp7p-53mflow

Hackney fails to properly release HTTP connections to the pool

May 28, 2025

References

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