PT-2026-42055 · Rsync · Rsync

Michal Ruprich · Published 2026-05-20 · Updated 2026-05-24 · CVE-2026-45232

Positive Technologies (AI Summary)

CVSS v3.1

3.7

Low

Base vector

AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Name of the Vulnerable Software and Affected Versions rsync versions prior to 3.4.3

Description An off-by-one out-of-bounds stack write exists in the establish proxy connection() function within socket.c. Network attackers can corrupt stack memory by sending a malformed HTTP proxy response. This occurs when the RSYNC PROXY environment variable is set and the attacker, by controlling the proxy server or positioning themselves between the client and proxy, sends a response line of 1023 or more bytes without a newline terminator, resulting in a null byte being written to an out-of-bounds stack address.

Recommendations Update to version 3.4.3 or later. As a temporary workaround, avoid setting the RSYNC PROXY environment variable to minimize the risk of exploitation.

Fix

Weakness Enumeration

CWE-193

Related Identifiers

CVE-2026-45232

OPENSUSE-SU-2026:10857-1

USN-8283-1

Affected Products

Rsync

References · 24

• https://github.com/RsyncProject/rsync/security/advisories/GHSA-8f85-j2cv-59m8 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-43619 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-45232 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8283-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-10158 · Vendor Advisory
• https://osv.dev/vulnerability/USN-8283-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-29518 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-41035 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10857-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-43618 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-45232 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-43617 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-45232 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-45232 · Security Note
• https://ubuntu.com/security/CVE-2026-43620 · Vendor Advisory