This page tracks the Ubuntu fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-70457 →

UBUNTU-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...

Original description

The description as published by the source.

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: OSV.dev (Open Source Vulnerabilities) OSV