CVE catalog
CVE-2026-45232
Rsync versions before 3.4.3 contain an off-by-one out-of-bounds stack write vulnerability in the establish_proxy_connection() function in socket.c that allows network attackers to corrupt stack memory
- Severity
- Medium · CVSS 5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.34% · Oct 25, 2026
Rsync versions before 3.4.3 contain an off-by-one out-of-bounds stack write vulnerability in the establish_proxy_connection() function in socket.c that allows network attackers to corrupt stack memory by sending a malformed HTTP proxy response. Attackers can exploit this by positioning themselves between the client and proxy or controlling the proxy server to send a response line of 1023 or more bytes without a newline terminator, causing a null byte to be written to an out-of-bounds stack address when the RSYNC_PROXY environment variable is set.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | rsync | sid | 3.5.1+ds1-2 | fixed |
| Debian | rsync | forky | 3.5.1+ds1-2 | fixed |
| Debian | rsync | trixie | 3.4.1+ds1-5+deb13u4 | fixed |
| Debian | rsync | trixie-security | 3.5.0+ds1-0+deb13u1 | fixed |
| Debian | rsync | bookworm | 3.2.7-1+deb12u6 | fixed |
| Debian | rsync | bookworm-security | 3.2.7-1+deb12u5 | vulnerable |
| Cpe | rsync | Not reported | 3.2.7-1ubuntu1.4 | fixed |
| Cpe | rsync | Not reported | 3.4.3 | fixed |
| Cpe | rsync | Not reported | 3.2.7-1+deb12u6 | fixed |
| Alpine | rsync | 3.20 | 3.4.3-r0 | fixed |
| Alpine | rsync | 3.21 | 3.4.3-r0 | fixed |
| Alpine | rsync | 3.22 | 3.4.3-r0 | fixed |
| Alpine | rsync | 3.23 | 3.4.3-r0 | fixed |
| Alpine | rsync | 3.24 | 3.4.3-r0 | fixed |
| Ubuntu | rsync | pro | 3.1.3-6 | vulnerable |
| Ubuntu | rsync | pro | 3.1.3-8 | vulnerable |
| Ubuntu | rsync | pro | 3.1.3-8ubuntu0.1 | vulnerable |
| Ubuntu | rsync | pro | 3.1.3-8ubuntu0.2 | vulnerable |
| Ubuntu | rsync | pro | 3.1.3-8ubuntu0.3 | vulnerable |
| Ubuntu | rsync | pro | 3.1.3-8ubuntu0.4 | vulnerable |
| Ubuntu | rsync | pro | 3.1.3-8ubuntu0.5 | vulnerable |
| Ubuntu | rsync | pro | 3.1.3-8ubuntu0.7 | vulnerable |
| Ubuntu | rsync | pro | 3.1.3-8ubuntu0.8 | vulnerable |
| Ubuntu | rsync | pro | 3.1.3-8ubuntu0.9 | vulnerable |
| Ubuntu | rsync | pro | 3.1.3-8ubuntu0.9+esm1 | fixed |
| Ubuntu | rsync | 22.04 | 3.2.3-4ubuntu1 | vulnerable |
| Ubuntu | rsync | 22.04 | 3.2.3-4ubuntu2 | vulnerable |
| Ubuntu | rsync | 22.04 | 3.2.3-8ubuntu1 | vulnerable |
| Ubuntu | rsync | 22.04 | 3.2.3-8ubuntu2 | vulnerable |
| Ubuntu | rsync | 22.04 | 3.2.3-8ubuntu3 | vulnerable |
| Ubuntu | rsync | 22.04 | 3.2.3-8ubuntu3.1 | vulnerable |
| Ubuntu | rsync | 22.04 | 3.2.7-0ubuntu0.22.04.2 | vulnerable |
| Ubuntu | rsync | 22.04 | 3.2.7-0ubuntu0.22.04.3 | vulnerable |
| Ubuntu | rsync | 22.04 | 3.2.7-0ubuntu0.22.04.4 | vulnerable |
| Ubuntu | rsync | 22.04 | 3.2.7-0ubuntu0.22.04.6 | fixed |
| Ubuntu | rsync | 24.04 | 3.2.7-1 | vulnerable |
| Ubuntu | rsync | 24.04 | 3.2.7-1build1 | vulnerable |
| Ubuntu | rsync | 24.04 | 3.2.7-1build2 | vulnerable |
| Ubuntu | rsync | 24.04 | 3.2.7-1ubuntu1 | vulnerable |
| Ubuntu | rsync | 24.04 | 3.2.7-1ubuntu1.1 | vulnerable |
| Ubuntu | rsync | 24.04 | 3.2.7-1ubuntu1.2 | vulnerable |
| Ubuntu | rsync | 24.04 | 3.2.7-1ubuntu1.4 | fixed |
| Ubuntu | rsync | 25.10 | 3.4.1+ds1-3 | vulnerable |
| Ubuntu | rsync | 25.10 | 3.4.1+ds1-4 | vulnerable |
| Ubuntu | rsync | 25.10 | 3.4.1+ds1-5 | vulnerable |
| Ubuntu | rsync | 25.10 | 3.4.1+ds1-5ubuntu1 | vulnerable |
| Ubuntu | rsync | 25.10 | 3.4.1+ds1-5ubuntu1.2 | fixed |
| Ubuntu | rsync | 26.04 | 3.4.1+ds1-5ubuntu1 | vulnerable |
| Ubuntu | rsync | 26.04 | 3.4.1+ds1-6 | vulnerable |
| Ubuntu | rsync | 26.04 | 3.4.1+ds1-7 | vulnerable |
| Ubuntu | rsync | 26.04 | 3.4.1+ds1-7ubuntu0.2 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | rsync | source | sid | 3.4.3+ds1-1 | not yet assigned | Not reported | Not reported |
| Debian | rsync | source | forky | 3.4.3+ds1-1 | not yet assigned | Not reported | Not reported |
| Debian | rsync | source | trixie | 3.4.1+ds1-5+deb13u4 | not yet assigned | Not reported | Not reported |
| Debian | rsync | source | bookworm | 3.2.7-1+deb12u6 | not yet assigned | Not reported | Not reported |
| Cpe | rsync | cpe | Not reported | 3.2.7-1ubuntu1.4 | Not reported | Not reported | Not reported |
| Cpe | rsync | cpe | Not reported | 3.4.3 | Not reported | Not reported | Not reported |
| Cpe | rsync | cpe | Not reported | 3.2.7-1+deb12u6 | Not reported | Not reported | Not reported |
| Alpine | rsync | apk | 3.20 | 3.4.3-r0 | Not reported | ALPINE-CVE-2026-45232 | Not reported |
| Alpine | rsync | apk | 3.21 | 3.4.3-r0 | Not reported | ALPINE-CVE-2026-45232 | Not reported |
| Alpine | rsync | apk | 3.22 | 3.4.3-r0 | Not reported | ALPINE-CVE-2026-45232 | Not reported |
| Alpine | rsync | apk | 3.23 | 3.4.3-r0 | Not reported | ALPINE-CVE-2026-45232 | Not reported |
| Alpine | rsync | apk | 3.24 | 3.4.3-r0 | Not reported | ALPINE-CVE-2026-45232 | Not reported |
| Ubuntu | rsync | deb | pro | 3.1.3-8ubuntu0.9+esm1 | Not reported | UBUNTU-CVE-2026-45232 | Not reported |
| Ubuntu | rsync | deb | 22.04 | 3.2.7-0ubuntu0.22.04.6 | Not reported | UBUNTU-CVE-2026-45232 | Not reported |
| Ubuntu | rsync | deb | 24.04 | 3.2.7-1ubuntu1.4 | Not reported | UBUNTU-CVE-2026-45232 | Not reported |
| Ubuntu | rsync | deb | 25.10 | 3.4.1+ds1-5ubuntu1.2 | Not reported | UBUNTU-CVE-2026-45232 | Not reported |
| Ubuntu | rsync | deb | 26.04 | 3.4.1+ds1-7ubuntu0.2 | Not reported | UBUNTU-CVE-2026-45232 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [rsync]Affected
Details (4)
3.2.7-1+deb12u6· amd64 · bookwormFixed · Fixed:
3.2.7-1+deb12u6nvd · rsync · debian · bookworm; nvd · rsync · debian · 12
3.2.7-1+deb12u6· arm64 · bookwormFixed · Fixed:
3.2.7-1+deb12u6nvd · rsync · debian · bookworm; nvd · rsync · debian · 12
3.2.7-1+deb12u5· amd64 · bookworm-securityAffected · Fixed:
3.2.7-1+deb12u6nvd · rsync · debian · bookworm; nvd · rsync · debian · 12
3.2.7-1+deb12u5· arm64 · bookworm-securityAffected · Fixed:
3.2.7-1+deb12u6nvd · rsync · debian · bookworm; nvd · rsync · debian · 12
[Debian 13 (Trixie)]
- [rsync]Affected
Details (5)
3.4.1+ds1-5+deb13u4· amd64 · trixieFixed · Fixed:
3.4.1+ds1-5+deb13u4nvd · rsync · debian · 13
3.4.1+ds1-5+deb13u4· arm64 · trixieFixed · Fixed:
3.4.1+ds1-5+deb13u4nvd · rsync · debian · 13
3.4.1+ds1-5+deb13u3· amd64 · trixie-security · Historical versionAffected · Fixed:
3.4.1+ds1-5+deb13u4nvd · rsync · debian · 13
3.4.1+ds1-5+deb13u3· arm64 · trixie-securityAffected · Fixed:
3.4.1+ds1-5+deb13u4nvd · rsync · debian · 13
3.5.0+ds1-0+deb13u1· amd64 · trixie-securityFixed · Fixed:
3.4.1+ds1-5+deb13u4nvd · rsync · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-45232]
- [https://osv.dev/vulnerability/ALPINE-CVE-2026-45232]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-45232]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-45232]
- [https://security-tracker.debian.org/tracker/CVE-2026-45232]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45232.json]
- [https://ubuntu.com/security/notices/USN-8283-1]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2455.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]