CVE-2026-56391
Severity CVSS v4.0:
MEDIUM
Type:
CWE-125
Out-of-bounds Read
Publication date:
24/07/2026
Last modified:
30/07/2026
Description
GNU coreutils uniq is vulnerable to an out‑of‑bounds read due to incorrect handling of multibyte input when the -w (--check-chars) option is used. The find_field() function miscalculates the byte length of characters by repeatedly processing a fixed pointer instead of advancing through the input, resulting in an inflated length value. <br />
This incorrect length is later used in a memcmp operation, causing reads beyond the allocated buffer when processing crafted multibyte input.<br />
<br />
When running GNU coreutils uniq with attacker-provided arguments, this behavior leads to a crash and potential adjacent heap memory exposure.<br />
<br />
<br />
This issue has been fixed in the commit d64e35a8a4c0e4608321433e0d84d917e4e36371.
Impact
Base Score 4.0
4.60
Severity 4.0
MEDIUM