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CVE-2026-56392 is a heap-based buffer overflow in the GNU coreutils unexpand utility affecting GNU coreutils through version 9.11. The flaw is caused by an integer overflow during buffer allocation when unexpand processes large tab stop values supplied via the -t option. The multiplication used to compute the required allocation size can wrap, resulting in an undersized heap buffer. Subsequent processing of crafted input can then write past the end of the allocated region, producing an out-of-bounds heap write. Successful triggering can crash the utility and, depending on allocator behavior and memory layout, may provide a limited heap write primitive.
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No public exploit code observed for this vulnerability.
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3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A reported vulnerability in GNU coreutils software.
A heap-based buffer overflow in GNU coreutils unexpand caused by integer overflow during buffer allocation when handling large -t tab stop values, potentially causing crashes and enabling a heap write primitive depending on memory layout.
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.