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CVE-2026-56391 on CTRL-OS 26.05

Aliases: CVE-2026-56391

Packages: coreutils

Status: Plausible

Advisory Information

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. This incorrect length is later used in a memcmp operation, causing reads beyond the allocated buffer when processing crafted multibyte input.

When running GNU coreutils uniq with attacker-provided arguments, this behavior leads to a crash and potential adjacent heap memory exposure.

This issue has been fixed in the commit d64e35a8a4c0e4608321433e0d84d917e4e36371.

Updates

2026-07-27 19:39 CEST

Metadata changes:

  • Status for package coreutils: “Plausible”

2026-07-27 19:38 CEST

Metadata changes:

  • Status for package coreutils: “New”