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.
CVSS Details
- CVSS 4.0 Base Score: 4.6 (MEDIUM)
- CVSS 4.0 Vector: (CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Redhat_linux | — | No solution existsUpgrade coreutils-singleUpgrade coreutils-single-debuginfoUpgrade coreutils-commonUpgrade coreutilsUpgrade coreutils-debuginfoUpgrade coreutils-debugsource | Jul 29, 2026 | Jul 24, 2026 |
| Rocky_linux | — | Upgrade coreutils-commonUpgrade coreutils-single-debuginfoUpgrade coreutils-debuginfoUpgrade coreutilsUpgrade coreutils-singleUpgrade coreutils-debugsource | Sep 21, 2026 | Sep 17, 2026 |
| Ubuntu | — | Upgrade coreutilsUpgrade gnu-coreutils | Aug 31, 2026 | Aug 31, 2026 |
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