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CVE-2026-53791 is an IP-address spoofing vulnerability in rsync daemon versions before 3.5.0. When the daemon is configured with proxy protocol = true, it accepts attacker-supplied source-address information from a PROXY protocol header without adequately limiting which peers may provide that header. An unauthenticated remote client can forge the claimed source IP address and cause rsync to evaluate IP-based access controls, including hosts allow/deny rules, against the forged address rather than the actual connecting address.
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What an attacker gets, and what they’ve been doing with it.
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proxy protocol = true where PROXY protocol support is not required. Where it is required, configure proxy protocol hosts to permit only explicitly trusted load balancers, reverse proxies, or other infrastructure that legitimately supplies PROXY protocol headers, and ensure the rsync daemon is not directly reachable by untrusted clients.Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical rsync vulnerability in the FreeBSD advisory; its cited CVSS v3 vector indicates network attackability without privileges or user interaction and high confidentiality and integrity impact.
A vulnerability referenced in a Fedora security advisory for the rsync package and used as the CVSS v3 score source; no specific technical details are provided in the content.
Unknown
A vulnerability fixed in version 3.5.0; no further details are provided in the content.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.