CVE-2026-45232

What it is

Rsync versions before 3.4.3 contain an off-by-one out-of-bounds stack write vulnerability in the establish_proxy_connection() function in socket.c that allows network attackers to corrupt stack memory by sending a malformed HTTP proxy response. Attackers can exploit this by positioning themselves between the client and proxy or controlling the proxy server to send a response line of 1023 or more bytes without a newline terminator, causing a null byte to be written to an out-of-bounds stack address when the RSYNC_PROXY environment variable is set.

At a glance

Exploitability

Can be exploited over the network without logging in, but needs a user to act. Limited direct impact.

Exploit odds

0.3% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-05-20 02:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-07-24 09:10 UTC Last updatedMost recent change to the record

Details

Published

2026-05-20 02:16 UTC

Last modified

2026-07-24 09:10 UTC

Exploit probability

0.3% · EPSS, next 30 days

Weakness

CWE-193

Record status

Analyzed

Affected

• Samba Rsync < 3.4.3

Attack profile CVSS 4.0 · 2.1

Attack vector

Network

Complexity

High

Attack requirements

None

Privileges needed

None

User interaction

Active

Confidentiality

None

Integrity

None

Availability

Low