CVE-2026-53783CWE-59CWE-88

CVE-2026-53783

High · published August 13, 2026

CVSS v3.1
8.1
EPSS
0%
Percentile
30.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00374 · 30.2th percentile
Weaknesses
CWE-59 · Improper Link Resolution Before File Access ('Link Following'); CWE-88 · Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
Published
2026-08-13T19:19Z
References (3)
https://github.com/RsyncProject/rsync/releases/tag/v3.5.0 · [email protected]https://github.com/RsyncProject/rsync/security/advisories/GHSA-9cgc-64g4-3gv5 · [email protected]https://www.vulncheck.com/advisories/rsync-toctou-race-condition-directory-escape-via-rrsync · [email protected]
EPSS history
Timeline
  • 13 AUG 14:34Z
    rsync < 3.5.0 TOCTOU Race Condition Directory Escape via rrsync
    cvelistv5