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CVE-2026-52859 is an out-of-bounds memory-access vulnerability in Vim terminal snapshot handling. Before Vim 9.2.0565, update_snapshot() in src/terminal.c copies visible terminal cells to the scrollback buffer by iterating a cell's fixed six-element chars[] array until a NUL terminator is found. A valid cell containing a base character and five combining marks has no NUL terminator. The function consequently reads beyond chars[] and appends excess values to a buffer sized for six characters, causing an out-of-bounds write. Malicious output displayed in a Vim :terminal window can trigger the condition and crash Vim.
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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.
18 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Vim denial-of-service vulnerability caused by an out-of-bounds write in terminal handling.
A vulnerability addressed by the Oracle Linux 10 Vim package security update; the content provides a CVSS v2 vector but no technical flaw details.
A vulnerability addressed by AlmaLinux advisory ALSA-2026:66348 for Vim packages; it has a CVSS v2 vector of AV:N/AC:L/Au:N/C:P/I:N/A:C.
A Vim denial-of-service vulnerability caused by an out-of-bounds write during terminal handling.
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.