Vulnerability · Published Aug 13, 2026 · Assigned by VulnCheck
CVE-2026-70454rsync < 3.5.0 TLS Certificate Validation Bypass via SSL/OpenSSL Mode
High 8.0
In plain English
A high-severity improper certificate validation 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 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
rsync 3.2.0 through 3.2.3 (openssl mode) and rsync-ssl through 3.4.4 (stunnel mode) contain a TLS certificate validation vulnerability that allows on-path attackers to intercept encrypted sessions by presenting self-signed or otherwise invalid certificates. Attackers can exploit the failure to validate server TLS certificates against a trusted CA or verify certificate hostname matching to decrypt or tamper with rsync session content without detection by the client.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | rsync | 3.5.0-3.el10_2 | ALSA-2026:67463 |
| 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: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-2026-70454 |
| Alpine:v3.22 | rsync | 3.5.0-r0 | ALPINE-CVE-2026-70454 |
| Alpine:v3.23 | rsync | 3.5.0-r0 | ALPINE-CVE-2026-70454 |
| Alpine:v3.24 | rsync | 3.5.0-r0 | ALPINE-CVE-2026-70454 |
| Debian:12 | rsync | no fix listed | DEBIAN-CVE-2026-70454 |
| Debian:13 | rsync | 3.5.0+ds1-0+deb13u1 | DEBIAN-CVE-2026-70454 |
| Debian:14 | rsync | 3.5.0+ds1-1 | DEBIAN-CVE-2026-70454 |
| Rocky Linux:10 | rsync | 0:3.5.0-3.el10_2 | RLSA-2026:67463 |
| Rocky Linux:9 | rsync | 0:3.2.7-1.el9_8 | RLSA-2026:67462 |
| Ubuntu:22.04:LTS | rsync | no fix listed | UBUNTU-CVE-2026-70454 |
| Ubuntu:24.04:LTS | rsync | no fix listed | UBUNTU-CVE-2026-70454 |
| Ubuntu:26.04:LTS | rsync | no fix listed | UBUNTU-CVE-2026-70454 |
| Ubuntu:26.10 | rsync | no fix listed | UBUNTU-CVE-2026-70454 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| RsyncProject | rsync | 0 – through 3.4.4 |
Weakness: CWE-295 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
References
- GitHub Security Advisory (GHSA-3c3x-ww2w-5r5p) vendor-advisory
- rsync 3.5.0 Release Notes release-notes
- https://www.vulncheck.com/advisories/rsync-tls-certificate-validation-bypass-via-ssl-openssl-mode third-party-advisory