Vulnerability in Rsyncproject Rsync
CVE-2026-45232
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.003 (25.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 25.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Rsyncproject Rsync — versions 0
- Samba Rsync
Weakness classification (CWE)
References
- github.com/RsyncProject/rsync/security/advisories/GHSA-8f85-j2cv-59m8 (vendor-advisory, Vendor Advisory)
- github.com/RsyncProject/rsync/releases/tag/v3.4.3 (release-notes, Release Notes)
- www.vulncheck.com/advisories/rsync-off-by-one-stack-write-via-http-proxy (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-45232?
- CVE-2026-45232 is a low-severity vulnerability in Rsyncproject Rsync, classified under Off-by-one Error. CVSS score: 3.1/10. Published 2026-05-20.
- How severe is CVE-2026-45232?
- Low severity. CVSS v3 base score is 3.1 out of 10.