What is CVE-2026-70457?

CVE-2026-70457 is a medium-severity vulnerability in Rsyncproject Rsync, classified under Incorrect Calculation of Buffer Size. CVSS score: 6.5/10. Published 2026-08-13.

How severe is CVE-2026-70457?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Buffer overflow in Rsyncproject Rsync

CVE-2026-70457

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 st…

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H.

Affected products

Rsyncproject Rsync — versions 3.2.3, 3.5.0

Weakness classification (CWE)

CWE-131 — Incorrect Calculation of Buffer Size
CWE-787 — Out-of-bounds Write

References

disclosure@vulncheck.com (release-notes)
disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-70457?: CVE-2026-70457 is a medium-severity vulnerability in Rsyncproject Rsync, classified under Incorrect Calculation of Buffer Size. CVSS score: 6.5/10. Published 2026-08-13.
How severe is CVE-2026-70457?: Medium severity. CVSS v3 base score is 6.5 out of 10.