9.1Critical
CVE-2026-53791rsync < 3.5.0 Daemon IP Spoofing via PROXY Protocol Header
Description
rsync daemon before 3.5.0 contains an IP address spoofing vulnerability that allows unauthenticated remote attackers to bypass IP-based access controls by sending a crafted PROXY protocol header with a forged source address. Attackers who can connect directly to the rsync daemon can inject a spoofed source IP in the PROXY protocol header to circumvent hosts allow/deny rules, gaining unauthorized access that would otherwise be blocked based on their real source address.
Weakness (CWE):
CWE-290
Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.
Affected products and versions
| Vendor | Product | Versions | |
|---|---|---|---|
| RsyncProject | rsync | ≤ 3.4.4, fixed 3.5.0 | |
| samba | rsync | ≤ 3.4.4 |
References and patches
- GitHub Security Advisory (GHSA-h2q9-5fr8-w635) vendor-advisoryVendor Advisory
- rsync 3.5.0 Release Notes release-notesProductRelease Notes
- https://www.vulncheck.com/advisories/rsync-daemon-ip-spoofing-via-proxy-protocol-header third-party-advisoryRelease NotesThird Party Advisory
CPE matches (NVD) (1)
cpe:2.3:a:samba:rsync:*:*:*:*:*:*:*:*< 3.5.0