---
id: CVE-2026-70462
title: "rsync 3.1.0 before 3.5.0\_contains a signed integer overflow vulnerability in the I/O timeout implementation that allows attackers to permanently disable connection timeouts by injecting MSG_IO_TIMEOUT messages carrying non-positive (zero…"
summary: "rsync 3.1.0 before 3.5.0\_contains a signed integer overflow vulnerability in the I/O timeout implementation that allows attackers to permanently disable connection timeouts by injecting MSG_IO_TIMEOUT messages carrying non-positive (zero…"
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
cwe:
  - CWE-190
  - CWE-835
published: '2026-08-13'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T20:28:37.587'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-70462'
references:
  - url: 'https://github.com/RsyncProject/rsync/releases/tag/v3.5.0'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/RsyncProject/rsync/security/advisories/GHSA-j9wh-5jmp-2m64
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/rsync-signed-integer-overflow-via-msg-io-timeout
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00452
epssPercentile: 0.36542
ingestedAt: '2026-09-08T21:11:12.277Z'
---

## Overview

rsync 3.1.0 before 3.5.0 contains a signed integer overflow vulnerability in the I/O timeout implementation that allows attackers to permanently disable connection timeouts by injecting MSG_IO_TIMEOUT messages carrying non-positive (zero or negative) values. Attackers can craft malicious MSG_IO_TIMEOUT messages that cause the timeout variable to wrap to a non-positive value, preventing the timeout check from firing and enabling idle or stalled connections to hold daemon slots indefinitely, leading to resource exhaustion.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.