High severity · published Aug 13, 2026
CVE-2026-70458
rsync 3.0.0 < 3.5.0 Out-of-Bounds Write via FLAG_HLINKED Handling
8.2
CVSS
0.4%
EPSS
No
On KEV
Description
rsync 3.0.0 before 3.5.0 contains an out-of-bounds write vulnerability that allows attackers to corrupt memory by triggering HLINK_BUMP processing on file entries with the FLAG_HLINKED flag set while the hard-link preservation option is inactive. Attackers can exploit the missing F_SUM field in the file_struct layout to access memory past the end of the allocated structure, corrupting adjacent heap or stack data.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 34% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RS
rsync · RsyncProject
3.0.0 through 3.4.4 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-70458
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-70458
github.com
https://github.com/RsyncProject/rsync/releases/tag/v3.5.0
github.com
https://github.com/RsyncProject/rsync/security/advisories/GHSA-gg3m-4m9m-268h
www.vulncheck.com
https://www.vulncheck.com/advisories/rsync-out-of-bounds-write-via-flag-hlinked-handling
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