RsyncProject rsync up to 3.4.2 Environment Variable socket.c establish_proxy_connection RSYNC_PROXY off-by-one

CVSS Meta Temp Score
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CTI Interest Score
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3.3$0-$5k0.00

Summaryinfo

A vulnerability was found in RsyncProject rsync up to 3.4.2. It has been classified as problematic. This affects the function establish_proxy_connection of the file socket.c of the component Environment Variable Handler. The manipulation of the argument RSYNC_PROXY leads to off-by-one. This vulnerability is uniquely identified as CVE-2026-45232. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in RsyncProject rsync up to 3.4.2. This issue affects the function establish_proxy_connection of the file socket.c of the component Environment Variable Handler. The manipulation of the argument RSYNC_PROXY with an unknown input leads to a off-by-one vulnerability. Using CWE to declare the problem leads to CWE-193. A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value. Impacted is availability. The summary by CVE is:

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.

The weakness was disclosed by Michal Ruprich as GHSA-8f85-j2cv-59m8. The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-45232 since 05/11/2026. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 315779 (Debian dsa-6282 : rsync - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.4.3 eliminates this vulnerability. The upgrade is hosted for download at github.com.

The vulnerability is also documented in the databases at Tenable (315779) and CERT Bund (WID-SEC-2026-1611). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Debian Linux
  • Fedora Linux
  • Ubuntu Linux
  • SUSE Linux
  • Open Source Rsync
  • SUSE openSUSE

Productinfo

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Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 3.3
VulDB Meta Temp Score: 3.3

VulDB Base Score: 3.1
VulDB Temp Score: 3.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 3.7
NVD Vector: 🔒

CNA Base Score: 3.1
CNA Vector (VulnCheck): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Off-by-one
CWE: CWE-193 / CWE-189
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 315779
Nessus Name: Debian dsa-6282 : rsync - security update

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: rsync 3.4.3

Timelineinfo

05/11/2026 CVE reserved
05/20/2026 +9 days Advisory disclosed
05/20/2026 +0 days VulDB entry created
06/02/2026 +12 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-8f85-j2cv-59m8
Researcher: Michal Ruprich
Status: Confirmed

CVE: CVE-2026-45232 (🔒)
GCVE (CVE): GCVE-0-2026-45232
GCVE (VulDB): GCVE-100-364817
CERT Bund: WID-SEC-2026-1611 - Rsync: Mehrere Schwachstellen

Entryinfo

Created: 05/20/2026 08:33
Updated: 06/02/2026 01:25
Changes: 05/20/2026 08:33 (82), 05/20/2026 19:40 (7), 05/21/2026 18:17 (2), 05/23/2026 21:04 (11), 05/26/2026 20:34 (1), 06/02/2026 01:25 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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