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CVE-2026-53783 is a time-of-check to time-of-use race in rsync versions before 3.5.0 affecting the rrsync restricted-shell wrapper. rrsync validates paths intended to confine an authenticated client to a permitted directory subtree, including resolution with realpath(), but subsequently performs transfer processing using the checked path. A client able to replace a validated path component with a symbolic link during this interval can redirect processing outside the enforced subtree. The wrapper also permits unsafe options, including link-copying, device-preservation, and log-file options, which can be leveraged in conjunction with the restriction bypass to access files beyond the authorized directory tree.
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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.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
One of 33 rsync security issues addressed by the FreeBSD advisory, involving path handling, daemon protocol, or related robustness/security hardening.
A vulnerability referenced in a Fedora security advisory for the rsync package; 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.