CVE-2026-45232

Summary

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.

Affected Software

Weaknesses

• CWE-193: Off-by-one Error

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

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

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