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CVE-2026-56392 is a heap-based buffer overflow in GNU coreutils unexpand affecting versions through 9.11. Large tab-stop values supplied through the -t option can trigger an integer overflow while calculating a buffer-allocation size. The resulting allocation may be smaller than required, after which processing crafted input writes beyond the heap buffer.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
18 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A moderate-severity, locally exploitable vulnerability affecting an unspecified AlmaLinux 9.2 package or component. Successful exploitation requires user interaction and can cause low integrity impact and high availability impact.
A moderate-severity locally exploitable vulnerability affecting Rocky Linux 9.6 systems covered by CLSA-2026-1788177078. Successful exploitation requires user interaction and can cause low integrity impact and high availability impact; the supplied information does not identify the affected component or flaw type.
A moderate-severity vulnerability affecting Miracle Linux 9 coreutils-common and coreutils-single packages. The supplied CVSS vectors indicate local attack access and required user interaction, with potential integrity impact and availability impact.
A vulnerability addressed by AlmaLinux security advisory ALSA-2026-67886 for AlmaLinux 10 coreutils packages. The supplied CVSS v2 vector indicates a local, low-complexity issue with potential integrity and availability impact.
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.