NFA regex engine NULL pointer dereference affects Vim < 9.2.0137

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.

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L

空指针解引用

Vim 代码问题漏洞

Vim是Vim开源的一款跨平台的文本编辑器。 Vim 9.1.0011至9.2.0137之前版本存在代码问题漏洞，该漏洞源于NFA正则表达式编译器在处理包含组合字符的字符范围时存在错误，可能导致空指针取消引用和分段违规。

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