CVE-2026-45232
Fixed in a distro release EPSS <1%CVSS 3.1
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.
Products: RsyncProject rsync
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Alpine 3.20 | rsync | 3.4.3-r0 |
| Alpine 3.21 | rsync | 3.4.3-r0 |
| Alpine 3.22 | rsync | 3.4.3-r0 |
| Alpine 3.23 | rsync | 3.4.3-r0 |
| Alpine 3.24 | rsync | 3.4.3-r0 |
| Amazon Linux 2023 | rsync | 3.5.1-1.amzn2023.0.1 |
| Amazon Linux 2023 | rsync-daemon | 3.5.1-1.amzn2023.0.1 |
| Debian 12 | rsync | 3.2.7-1+deb12u6 |
| Debian 13 | rsync | 3.4.1+ds1-5+deb13u4 |
| Debian 14 | rsync | 3.4.3+ds1-1 |
| SUSE Linux Enterprise Server 16.0 | rsync | 3.4.1-160000.4.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | rsync | 3.4.1-160000.4.1 |
| Ubuntu 22.04 LTS | rsync | 3.2.7-0ubuntu0.22.04.7 |
| Ubuntu 22.04 LTS | rsync | 3.2.7-0ubuntu0.22.04.6 |
| Ubuntu 24.04 LTS | rsync | 3.2.7-1ubuntu1.5 |
| Ubuntu 24.04 LTS | rsync | 3.2.7-1ubuntu1.4 |
| Ubuntu 25.10 | rsync | 3.4.1+ds1-5ubuntu1.3 |
| Ubuntu 25.10 | rsync | 3.4.1+ds1-5ubuntu1.2 |
| Ubuntu 26.04 LTS | rsync | 3.4.1+ds1-7ubuntu0.2 |
| Ubuntu 26.04 LTS | rsync | 3.4.1+ds1-7ubuntu0.3 |
| Ubuntu Pro 14.04 LTS | rsync | 3.1.0-2ubuntu0.4+esm4 |
| Ubuntu Pro 14.04 LTS | rsync | 3.1.0-2ubuntu0.4+esm3 |
| Ubuntu Pro 16.04 LTS | rsync | 3.1.1-3ubuntu1.3+esm5 |
| Ubuntu Pro 16.04 LTS | rsync | 3.1.1-3ubuntu1.3+esm6 |
| Ubuntu Pro 18.04 LTS | rsync | 3.1.2-2.1ubuntu1.6+esm3 |
| Ubuntu Pro 18.04 LTS | rsync | 3.1.2-2.1ubuntu1.6+esm4 |
| Ubuntu Pro 20.04 LTS | rsync | 3.1.3-8ubuntu0.9+esm1 |
| Ubuntu Pro 20.04 LTS | rsync | 3.1.3-8ubuntu0.9+esm2 |
| openSUSE Tumbleweed | rsync | 3.4.3-1.1 |