CVE-2026-70458 PUBLISHED

rsync 3.0.0 < 3.5.0 Out-of-Bounds Write via FLAG_HLINKED Handling

Assigner: VulnCheck
Reserved: 04.08.2026 Published: 13.08.2026 Updated: 13.08.2026

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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
CVSS Score: 8.8

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	Low	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
CVSS Score: 8.2

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	Low
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	RsyncProject
Product	rsync
Versions	Default: unaffected affected from 3.0.0 to 3.4.4 (incl.) Version 3.5.0 is unaffected

CVE-2026-70458 PUBLISHED

rsync 3.0.0 < 3.5.0 Out-of-Bounds Write via FLAG_HLINKED Handling

Metrics

Product Status

Credits

References

Problem Types