CVE-2026-70462

rsync 3.1.0 < 3.5.0 Signed Integer Overflow via MSG_IO_TIMEOUT

Published: Aug 13, 2026Updated: Sep 8, 2026 Sources: CVE List NVDCWE-190

6.5MEDIUM

Description

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:RUser Interaction

Required

Scope

S:UScope

Unchanged

Impact

C:NConfidentiality

None

I:NIntegrity

None

A:HAvailability

High

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Weaknesses

CWE-190 CWE-835

Affected Products

RsyncProject

oss-projectaka rsync project, rsync

rsyncLibrary

OSS Libraries / generic-library

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques

Impact

Initial Access

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References

https://github.com/RsyncProject/rsync/security/advisories/GHSA-j9wh-5jmp-2m64

github.com

https://github.com/RsyncProject/rsync/releases/tag/v3.5.0

github.com

https://www.vulncheck.com/advisories/rsync-signed-integer-overflow-via-msg-io-timeout

vulncheck.com

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