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CVE-2026-45232

Rsync < 3.4.3 Off-by-One Stack Write via HTTP Proxy

Published: May 20, 2026Updated: May 21, 2026 Sources: CVE List NVDCWE-193
3.1LOW
NVD MITRE
EPSS Score
0.3%
Top 74.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:RS:UC:NI:NA:L
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:LAvailability
Low
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Weaknesses

CWE-193

Affected Products

RsyncProject
oss-projectaka rsync, rsync project
rsyncLibrary
OSS Libraries / generic-library
samba
oss-project·DE
rsyncOn-prem
OSS Libraries / generic-library

Exploitability

Official Patch Available
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References

https://github.com/RsyncProject/rsync/security/advisories/GHSA-8f85-j2cv-59m8
github.com
https://github.com/RsyncProject/rsync/releases/tag/v3.4.3
github.com
https://www.vulncheck.com/advisories/rsync-off-by-one-stack-write-via-http-proxy
vulncheck.com
News mentions
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