---
title: "CVE-2026-45232\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2026-45232?format=md
keywords: index, follow
---

# CVE-2026-45232

Publication date 20 May 2026

Last updated 19 June 2026

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**3.1 · Low**

[Score breakdown](https://ubuntu.com/security/CVE-2026-45232?format=md#impact-score)

Toggle side navigation

## Description

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.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| rsync | 26.04 LTS resolute | Fixed 3.4.1+ds1-7ubuntu0.2 |
| 25.10 questing | Fixed 3.4.1+ds1-5ubuntu1.2 |
| 24.04 LTS noble | Fixed 3.2.7-1ubuntu1.4 |
| 22.04 LTS jammy | Fixed 3.2.7-0ubuntu0.22.04.6 |
| 20.04 LTS focal | Fixed 3.1.3-8ubuntu0.9+esm1  Ubuntu Pro |
| 18.04 LTS bionic | Fixed 3.1.2-2.1ubuntu1.6+esm3  Ubuntu Pro |
| 16.04 LTS xenial | Fixed 3.1.1-3ubuntu1.3+esm5  Ubuntu Pro |
| 14.04 LTS trusty | Fixed 3.1.0-2ubuntu0.4+esm3  Ubuntu Pro |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

### Get expanded security coverage with Ubuntu Pro

Reduce your average CVE exposure time from 98 days to 1 day with expanded CVE patching, ten-years security maintenance and optional support for the full stack of open-source applications. Free for personal use.

[Get Ubuntu Pro](https://ubuntu.com/pro)
[30-day free trial](https://ubuntu.com/pro/free-trial)

## Severity score breakdown

CVSS version:

CVSS v4.0

[CVSS v4.0](https://ubuntu.com/security/CVE-2026-45232?format=md)
[CVSS v3.0](https://ubuntu.com/security/CVE-2026-45232?format=md)

**Base score**

2.1 · Low

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | High |
  | Attack requirements | None |
  | Privileges required | None |
  | User interaction | Active |
  | Vulnerable system - Confidentiality impact | None |
  | Vulnerable system - Integrity impact | None |
  | Vulnerable system - Availability impact | Low |
  | Subsequent system - Confidentiality impact | None |
  | Subsequent system - Integrity impact | None |
  | Subsequent system - Availability impact | None |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 2.1 · Low |
  | Base + Threat score | - |
  | Base + Environmental score | - |
  | Base + Threat + Environmental score | - |

**Vector:** CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-45232)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-45232)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-45232)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-45232)

### Related Ubuntu Security Notices (USN)

+ [USN-8283-1](https://usn.ubuntu.com/USN-8283-1)
+ rsync vulnerabilities
+ 20 May 2026

+ [USN-8349-1](https://usn.ubuntu.com/USN-8349-1)
+ rsync vulnerabilities
+ 1 June 2026

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-45232>