CVE-2026-53783

HIGH

rsync before 3.5.0 contains a time-of-check to time-of-use (TOCTOU) race condition vulnerability in the rrsync restricted shell wrapper that allows authenticated clients to escape enforced directory restrictions by substituting a symlink for a path component after validation but before transfer processing. Attackers can additionally leverage unrestricted flags such as --copy-unsafe-links, -D, and --log-file through rrsync to read or write files outside the permitted directory subtree.

CVSS v3.1 Score

8.1
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Published: 8/13/2026Modified: 8/14/2026

Related Intelligence (1)

HIGHVulnerability

NVD HIGH: CVE-2026-53783 — rsync before 3.5.0 contains a time-of-check to time-of-use (TOCTOU) race conditi...

rsync before 3.5.0 contains a time-of-check to time-of-use (TOCTOU) race condition vulnerability in the rrsync restricted shell wrapper that allows authenticated clients to escape enforced directory restrictions by substituting a symlink for a path component after validation but before transfer processing. Attackers can additionally leverage unrestricted flags such as --copy-unsafe-links, -D, and

CVE-2026-53783
NIST NVD

References (3)

https://github.com/RsyncProject/rsync/releases/tag/v3.5.0https://github.com/RsyncProject/rsync/security/advisories/GHSA-9cgc-64g4-3gv5https://www.vulncheck.com/advisories/rsync-toctou-race-condition-directory-escape-via-rrsync