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Back to active CVEs
Medium · CVSS 6.3CVE-2026-109438

3proxy 0.9.7 - 1.0.1 Uninitialized Stack Memory Disclosure via SOCKS4CVE-2026-109438

Answer in brief

CVE-2026-109438 records a Medium severity (CVSS 6.3) vulnerability in 3proxy 0.9.7 - 1.0.1 Uninitialized Stack Memory Disclosure via SOCKS4. The current sources do not mark it as known exploited. The current feed maps 3proxy/3proxy (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 14, 2026Updated Oct 14, 2026Source checked Oct 14, 2026First seen by HOL Oct 14, 2026Material review Oct 14, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.3
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 6.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps 3proxy/3proxy (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
3proxy/3proxygeneric>=0.9.7 <=1.0.1Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for 3proxy/3proxy.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Oct 14, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 14, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 14, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Junos OS and Junos OS Evolved: In a scenario with VPN-flowspec and BMP monitoring a specific BGP update causes an rpd crashSame generic ecosystem
  • Junos OS and Junos OS Evolved: A malformed LSP-ping causes an rpd crashSame generic ecosystem
  • Junos OS and Junos OS Evolved: A specific BGP packet causes an rpd crash when an ECMP qualifier is used in an import policySame generic ecosystem
  • Junos OS and Junos OS Evolved: An attacker sending a malformed update causes an rpd crash when BGP EVPN signaling is usedSame generic ecosystem
  • Junos OS and Junos OS Evolved: A BGP EVPN neighbor causes an rpd crash when SRv6 multihoming is usedSame generic ecosystem
  • Junos OS and Junos OS Evolved: An attacker can cause an rpd crash via a crafted LDP messageSame generic ecosystem

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-908
Source
CVE List V5
Source checked
Oct 14, 2026
References
2 linked sources
Open source record