3proxy up to 1.0.1 SOCKS4 Reply Path uninitialized resource

CVSS Meta Temp Score
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CTI Interest Score
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5.2$0-$5k1.28-

Summaryinfo

A vulnerability was found in 3proxy up to 1.0.1. It has been declared as problematic. Impacted is an unknown function of the component SOCKS4 Reply Path. Such manipulation leads to uninitialized resource. This vulnerability is uniquely identified as CVE-2026-109438. The attack can be launched remotely. No exploit exists. It is best practice to apply a patch to resolve this issue.

Detailsinfo

A vulnerability was found in 3proxy up to 1.0.1 and classified as problematic. Affected by this issue is some unknown processing of the component SOCKS4 Reply Path. The manipulation with an unknown input leads to a uninitialized resource vulnerability. Using CWE to declare the problem leads to CWE-908. The product uses or accesses a resource that has not been initialized. Impacted is confidentiality. CVE summarizes:

3proxy from 0.9.7 through 1.0.1, fixed in commit 206c923, contains an uninitialized stack memory disclosure vulnerability that allows unauthenticated attackers to leak stack bytes via the SOCKS4 reply path when the external-NAT option (-Ne) is configured. Attackers can send a client probe that fails the SOCKS version check to trigger a reply containing uninitialized bytes from the sin structure, exposing high bytes of a userspace pointer that weakens ASLR protections.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-109438 since 10/12/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available.

Applying the patch 206c923d6cd433bd2e7196375442650c328b8bfa is able to eliminate this problem.

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Productinfo

Type

Name

Version

Website

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: 5.2

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

CNA Base Score: 5.3
CNA Vector (VulnCheck): 🔒

CVSSv2info

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

Exploitinginfo

Class: Uninitialized resource
CWE: CWE-908
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: 206c923d6cd433bd2e7196375442650c328b8bfa

Timelineinfo

10/12/2026 CVE reserved
10/14/2026 +2 days Advisory disclosed
10/14/2026 +0 days VulDB entry created
10/14/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-109438 (🔒)
GCVE (CVE): GCVE-0-2026-109438
GCVE (VulDB): GCVE-100-420062

Entryinfo

Created: 10/14/2026 18:31
Changes: 10/14/2026 18:31 (76)
Complete: 🔍
Cache ID: 216::103

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