Bug 2552572 (CVE-2026-109438) - CVE-2026-109438 3proxy: 3proxy: Information disclosure via uninitialized stack memory in SOCKS reply
Summary: CVE-2026-109438 3proxy: 3proxy: Information disclosure via uninitialized stac...
Keywords:
Status: NEW
Alias: CVE-2026-109438
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2553106 2553107
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-14 17:22 UTC by OSIDB Bzimport
Modified: 2026-10-15 08:47 UTC (History)
0 users

Fixed In Version:
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Description OSIDB Bzimport 2026-10-14 17:22:52 UTC 
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.
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