Vulnerability · Published Aug 13, 2026 · Assigned by VulnCheck
CVE-2026-53783rsync < 3.5.0 TOCTOU Race Condition Directory Escape via rrsync
High 8.1
In plain English
A high-severity argument injection in rsync from RsyncProject. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | rsync | 3.5.0-3.el10_2 | ALSA-2026:67463 |
| AlmaLinux:8 | rsync | 3.1.3-28.el8_10 | ALSA-2026:74095 |
| AlmaLinux:9 | rsync | 3.2.7-1.el9_8 | ALSA-2026:67462 |
| AlmaLinux:10 | rsync-daemon | 3.5.0-3.el10_2 | ALSA-2026:67463 |
| AlmaLinux:8 | rsync-daemon | 3.1.3-28.el8_10 | ALSA-2026:74095 |
| AlmaLinux:9 | rsync-daemon | 3.2.7-1.el9_8 | ALSA-2026:67462 |
| AlmaLinux:10 | rsync-rrsync | 3.5.0-3.el10_2 | ALSA-2026:67463 |
| AlmaLinux:9 | rsync-rrsync | 3.2.7-1.el9_8 | ALSA-2026:67462 |
| Alpine:v3.21 | rsync | 3.5.0-r0 | ALPINE-CVE-2026-53783 |
| Alpine:v3.22 | rsync | 3.5.0-r0 | ALPINE-CVE-2026-53783 |
| Alpine:v3.23 | rsync | 3.5.0-r0 | ALPINE-CVE-2026-53783 |
| Alpine:v3.24 | rsync | 3.5.0-r0 | ALPINE-CVE-2026-53783 |
| Debian:12 | rsync | no fix listed | DEBIAN-CVE-2026-53783 |
| Debian:13 | rsync | 3.5.0+ds1-0+deb13u1 | DEBIAN-CVE-2026-53783 |
| Debian:14 | rsync | 3.5.0+ds1-1 | DEBIAN-CVE-2026-53783 |
| Rocky Linux:10 | rsync | 0:3.5.0-3.el10_2 | RLSA-2026:67463 |
| Rocky Linux:8 | rsync | 0:3.1.3-28.el8_10 | RLSA-2026:74095 |
| Rocky Linux:9 | rsync | 0:3.2.7-1.el9_8 | RLSA-2026:67462 |
| Ubuntu:22.04:LTS | rsync | no fix listed | UBUNTU-CVE-2026-53783 |
| Ubuntu:24.04:LTS | rsync | no fix listed | UBUNTU-CVE-2026-53783 |
| Ubuntu:26.04:LTS | rsync | no fix listed | UBUNTU-CVE-2026-53783 |
| Ubuntu:26.10 | rsync | no fix listed | UBUNTU-CVE-2026-53783 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| RsyncProject | rsync | 0 – through 3.4.4 |
Weakness: CWE-59, CWE-88 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
References
- GitHub Security Advisory (GHSA-9cgc-64g4-3gv5) vendor-advisory
- rsync 3.5.0 Release Notes release-notes
- https://www.vulncheck.com/advisories/rsync-toctou-race-condition-directory-escape-via-rrsync third-party-advisory