Out-of-bounds write in Rsync - CVE-2026-70458
Published: August 13, 2026
Vulnerability identifier: #VU142272
CSH Severity: High
CVSS v4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-70458
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service and modify data.
The vulnerability exists due to out-of-bounds write in the rsync file list handling logic when processing a file entry marked FLAG_HLINKED even though hard links were not negotiated. A remote attacker can send a specially crafted file entry to cause a denial of service and modify data.
Exploitation requires protocol-30 incremental recursion, a regular file entry, and use of --checksum with hard links disabled.
Affected software
Rsync
How to mitigate CVE-2026-70458
Install security update from vendor's website.
Rsync - update to 3.5.0