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CVE-2026-56391 is an out-of-bounds read in the GNU coreutils uniq utility affecting versions 9.5 through 9.11. When uniq processes crafted multibyte input with the -w (--check-chars) option, find_field() repeatedly processes a fixed input pointer rather than advancing through the character sequence. This miscalculates and inflates a character byte-length value. A subsequent memcmp operation uses that erroneous length and can read beyond the allocated input buffer.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability addressed by AlmaLinux security advisory ALSA-2026-67886 for AlmaLinux 10 coreutils packages. The supplied CVSS data rates it as a local, low-complexity issue requiring user interaction, with no privileges required.
A Rocky Linux 10 coreutils-related vulnerability tracked in RLSA-2026-67886. The supplied CVSS vectors describe a local attack with no privileges required and user interaction required, with availability impact.
A locally exploitable vulnerability affecting Oracle Linux 10 Coreutils packages. The supplied CVSS v3 vector indicates local access, no privileges required, user interaction required, and low integrity/high availability impact.
An out-of-bounds read in GNU coreutils uniq when processing multibyte input, permitting denial of service and information disclosure.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.