Out-of-Bounds Write Vulnerability in Rsync by Rsync Project
CVE-2026-70456

8.8HIGH

Key Information:

Vendor

Rsyncproject

Status
Rsync
Vendor
CVE Published:
13 August 2026

What is CVE-2026-70456?

Rsync versions prior to 3.5.0 suffer from an out-of-bounds write vulnerability in the read_args() function. This flaw arises when a malicious sender crafts an argument list that exceeds the allocation boundary. Specifically, if the argument count fills the argv allocation to its limit, the following NULL terminator can overwrite adjacent heap memory, potentially leading to corruption and instability in the system.

Affected Version(s)

rsync 3.0.1 <= 3.4.4

rsync 3.5.0

References

https://github.com/RsyncProject/rsync/security/advisories...
vendor-advisory
https://github.com/RsyncProject/rsync/releases/tag/v3.5.0
release-notes
https://www.vulncheck.com/advisories/rsync-heap-out-of-bo...
third-party-advisory

CVSS V4

Score:
8.8
Severity:
HIGH
Confidentiality:
None
Integrity:
Low
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

gregkh
.