hackney up to 1.23.x HTTP Connection release of resource

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.1$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic was found in hackney up to 1.23.x. Impacted is an unknown function of the component HTTP Connection Handler. Such manipulation leads to release of resource. This vulnerability is documented as CVE-2025-3864. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in hackney up to 1.23.x. It has been rated as problematic. Affected by this issue is an unknown function of the component HTTP Connection Handler. The manipulation with an unknown input leads to a release of resource vulnerability. Using CWE to declare the problem leads to CWE-772. The product does not release a resource after its effective lifetime has ended, i.e., after the resource is no longer needed. Impacted is availability. CVE summarizes:

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.

The weakness was released by Marcin Wyczechowski and Paweł Zdunek with AFINE Team. The advisory is shared for download at github.com. This vulnerability is handled as CVE-2025-3864 since 04/22/2025. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 1.24.0 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔍
CNA CVSS-BT Score: 🔍
CNA Vector: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Release of resource
CWE: CWE-772 / CWE-400 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: hackney 1.24.0

Timelineinfo

04/22/2025 🔍
05/28/2025 +36 days 🔍
05/28/2025 +0 days 🔍
01/26/2026 +243 days 🔍

Sourcesinfo

Advisory: github.com
Researcher: Marcin Wyczechowski, Paweł Zdunek
Organization: AFINE Team
Status: Confirmed

CVE: CVE-2025-3864 (🔍)
GCVE (CVE): GCVE-0-2025-3864
GCVE (VulDB): GCVE-100-310436

Entryinfo

Created: 05/28/2025 13:41
Updated: 01/26/2026 14:40
Changes: 05/28/2025 13:41 (67), 01/26/2026 14:40 (1)
Complete: 🔍
Cache ID: 216::103

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