CVE-2026-32249 — NFA regex engine NULL pointer dereference affects Vim < 9.2.0137

Affected: vim

Vim is an open source, command line text editor. From 9.1.0011 to before 9.2.0137, Vim's NFA regex compiler, when encountering a collection containing a combining character as the endpoint of a character range (e.g. [0-0\u05bb]), incorrectly emits the composing bytes of that character as separate NFA states. This corrupts the NFA postfix stack, resulting in NFA_START_COLL having a NULL out1 pointer. When nfa_max_width() subsequently traverses the compiled NFA to estimate match width for the look-behind assertion, it dereferences state->out1->out without a NULL check, causing a segmentation fault. This vulnerability is fixed in 9.2.0137.

USN-8171-1 — vim vulnerabilities

Affected: Ubuntu:Pro:14.04:LTS: vim, Ubuntu:Pro:16.04:LTS: vim, Ubuntu:Pro:18.04:LTS: vim, Ubuntu:Pro:20.04:LTS: vim, Ubuntu:22.04:LTS: vim, Ubuntu:24.04:LTS: vim, Ubuntu:25.10: vim

Nathan Mills discovered that Vim could crash when parsing certain regular expressions. An attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 24.04 LTS and Ubuntu 25.10 (CVE-2026-32249)

It was discovered that Vim did not properly sanitize user input. An attacker could possibly use this issue to execute arbitrary commands. (CVE-2026-33412)

Avishay Matayev discovered that Vim's modeline sandbox could be bypassed when opening a maliciously-crafted file. An attacker could possibly use this issue to execute arbitrary commands. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 25.10. (CVE-2026-34982)

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CVE-2026-32249 — NFA regex engine NULL pointer dereference affects Vim < 9.2.0137

USN-8171-1 — vim vulnerabilities