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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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Oracle_linux | — | Upgrade coreutils-commonUpgrade coreutils-singleUpgrade coreutils | Oct 22, 2026 | Jul 24, 2026 |
| Redhat_linux | — | Upgrade coreutils-debuginfoUpgrade coreutils-debugsourceUpgrade coreutilsNo solution existsUpgrade coreutils-singleUpgrade coreutils-single-debuginfoUpgrade coreutils-common | Jul 29, 2026 | Jul 24, 2026 |
| Rocky_linux | — | Upgrade coreutils-single-debuginfoUpgrade coreutilsUpgrade coreutils-debuginfoUpgrade coreutils-debugsourceUpgrade coreutils-singleUpgrade coreutils-common | Sep 21, 2026 | Sep 17, 2026 |
| Ubuntu | — | Upgrade gnu-coreutilsUpgrade coreutils | Aug 31, 2026 | Aug 31, 2026 |
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