CVE-2026-70457

MEDIUM 6.5

rsync 3.2.3 < 3.5.0 Out-of-Bounds Write via parse_size_arg()

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

rsync 3.2.3 before 3.5.0 contains an out-of-bounds write in parse_size_arg() where the return value of snprintf() is used directly as an index into a .bss-segment array without bounds checking. When snprintf truncates the formatted size string, the return value equals the number of characters that would have been written including the truncated portion, and this value may exceed the array length. The subsequent indexed write targets memory outside the intended array bounds, corrupting .bss memory.

CWE	CWE-131 CWE-787
Vendor	rsyncproject
Product	rsync
Published	Aug 13, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

High

Affected Versions

RsyncProject / rsync

3.2.3 ≤ 3.4.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/RsyncProject/rsync/security/advisories/GHSA-pg7g-xqmr-xpfh github.com: https://github.com/RsyncProject/rsync/releases/tag/v3.5.0 vulncheck.com: https://www.vulncheck.com/advisories/rsync-out-of-bounds-write-via-parse-size-arg

Credits

gregkh