CVE-2026-109438
Medium
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.
SeverityMedium
CVSS5.3
Exploit probability—
Product3proxy
PublishedOct 14, 2026
First seenOct 14, 2026
Weakness typeCWE-908CWE-908
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| 3proxy 3proxy | 0.9.7 ≤ v ≤ 1.0.1 | — |
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