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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.

PUBLISHED Reserved 2026-05-11 | Published 2026-05-20 | Updated 2026-05-20 | Assigner VulnCheck




LOW: 2.1CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

LOW: 3.1CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L

Problem types

Off-by-one Error

Product status

Default status
unaffected

Any version before 3.4.3
affected

Credits

Michal Ruprich finder

References

github.com/.../rsync/security/advisories/GHSA-8f85-j2cv-59m8 vendor-advisory

github.com/RsyncProject/rsync/releases/tag/v3.4.3 release-notes

www.vulncheck.com/...c-off-by-one-stack-write-via-http-proxy third-party-advisory

cve.org (CVE-2026-45232)

nvd.nist.gov (CVE-2026-45232)

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