CVE-2026-45232
Publication date 20 May 2026
Last updated 22 May 2026
Ubuntu priority
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
| 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 |
Needs evaluation
|
|
| 18.04 LTS bionic |
Needs evaluation
|
|
| 16.04 LTS xenial |
Needs evaluation
|
|
| 14.04 LTS trusty |
Needs evaluation
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
3.1 · Low
|
| Attack vector | Network |
| Attack complexity | High |
| Privileges required | None |
| User interaction | Required |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | Low |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L |
References
Related Ubuntu Security Notices (USN)
- USN-8283-1
- rsync vulnerabilities
- 20 May 2026