Is CVE-2026-109438 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-109438?

CVE-2026-109438 has a CVSS v3 severity of MEDIUM (5.3).

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CVE-2026-109438

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.