Vulnerability · Published Aug 13, 2026 · Assigned by VulnCheck
CVE-2026-70458rsync 3.0.0 < 3.5.0 Out-of-Bounds Write via FLAG_HLINKED Handling
High 8.2
In plain English
A high-severity out-of-bounds write 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 34% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
rsync 3.0.0 before 3.5.0 contains an out-of-bounds write vulnerability that allows attackers to corrupt memory by triggering HLINK_BUMP processing on file entries with the FLAG_HLINKED flag set while the hard-link preservation option is inactive. Attackers can exploit the missing F_SUM field in the file_struct layout to access memory past the end of the allocated structure, corrupting adjacent heap or stack data.
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-2026-70458 |
| Alpine:v3.22 | rsync | 3.5.0-r0 | ALPINE-CVE-2026-70458 |
| Alpine:v3.23 | rsync | 3.5.0-r0 | ALPINE-CVE-2026-70458 |
| Alpine:v3.24 | rsync | 3.5.0-r0 | ALPINE-CVE-2026-70458 |
| Debian:12 | rsync | no fix listed | DEBIAN-CVE-2026-70458 |
| Debian:13 | rsync | 3.5.0+ds1-0+deb13u1 | DEBIAN-CVE-2026-70458 |
| Debian:14 | rsync | 3.5.0+ds1-1 | DEBIAN-CVE-2026-70458 |
| 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-2026-70458 |
| Ubuntu:24.04:LTS | rsync | no fix listed | UBUNTU-CVE-2026-70458 |
| Ubuntu:26.04:LTS | rsync | no fix listed | UBUNTU-CVE-2026-70458 |
| Ubuntu:26.10 | rsync | no fix listed | UBUNTU-CVE-2026-70458 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| RsyncProject | rsync | 3.0.0 – through 3.4.4 |
Weakness: CWE-787 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
References
- GitHub Security Advisory (GHSA-gg3m-4m9m-268h) vendor-advisory
- rsync 3.5.0 Release Notes release-notes
- https://www.vulncheck.com/advisories/rsync-out-of-bounds-write-via-flag-hlinked-handling third-party-advisory