CVE intelligence

CVE-2026-70457

Vulnerability intelligence

Published Aug 13, 2026Sources checked Oct 28, 2026

8.2HIGHCVSS out of 10

What this means

Review the available evidence

CVE-2026-70457 and is rated High severity with a CVSS score of 8.2. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Microsoft Security Response Center guidance

Vendor revision: Aug 23, 2026

CBL-Mariner Releases

Vendor-listed releases

3.5.0-1

CISA KEVNot listedBased on the latest collected catalog

EPSS0.4%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is 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 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.

Source: NVD