CVE-2026-45232 Rsync < 3.4.3 Off-by-One Stack Write via HTTP Proxy
Network attackers can corrupt stack memory and potentially execute code by sending malformed HTTP proxy responses to Rsync clients configured with a proxy.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-45232?
CVE-2026-45232 is a low-severity memory corruption vulnerability in RsyncProject rsync, published on 20 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-193
Which versions are affected by CVE-2026-45232?
It affects 1 product.
Products include Samba Rsync.
How do I fix CVE-2026-45232?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-45232 being exploited?
There is no known exploitation of CVE-2026-45232 in the wild and no public exploit code.
Other vulnerabilities in RsyncProject rsync
- CVE-2017-15994 Security feature bypass in n/a
- CVE-2026-53791 rsync < 3.5.0 Daemon IP Spoofing via PROXY Protocol Header
- CVE-2026-70461 rsync 3.2.5 < 3.5.0 Heap Out-of-Bounds Write via files-from Entry
- CVE-2026-70455 rsync 3.4.2 < 3.5.0 DoS via --zt Zstandard Compression Thread Exhaustion
- CVE-2026-70463 rsync 3.1.0 < 3.5.0 Authorization Bypass via auth users Directive Parsing
Sources
Also known as ALPINE-CVE-2026-45232, AZL-86997, BELL-CVE-2026-45232, CLSA-2026-1780922909, CLSA-2026-1782981361, DEBIAN-CVE-2026-45232 and 4 more.