Integer overflow in table parsing extension leads to heap memory corruption

cmark-gfm is GitHub's extended version of the C reference implementation of CommonMark. Prior to versions 0.29.0.gfm.3 and 0.28.3.gfm.21, an integer overflow in cmark-gfm's table row parsing `table.c:row_from_string` may lead to heap memory corruption when parsing tables who's marker rows contain more than UINT16_MAX columns. The impact of this heap corruption ranges from Information Leak to Arbitrary Code Execution depending on how and where `cmark-gfm` is used. If `cmark-gfm` is used for rendering remote user controlled markdown, this vulnerability may lead to Remote Code Execution (RCE) in applications employing affected versions of the `cmark-gfm` library. This vulnerability has been patched in the following cmark-gfm versions 0.29.0.gfm.3 and 0.28.3.gfm.21. A workaround is available. The vulnerability exists in the table markdown extensions of cmark-gfm. Disabling the table extension will prevent this vulnerability from being triggered.

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

整数溢出或超界折返

cmark-gfm 输入验证错误漏洞

cmark-gfm是CommonMark的 C 参考实现的扩展版本，是带有规范的 Markdown 语法的合理化版本。 cmark-gfm 存在输入验证错误漏洞，该漏洞可能会导致使用受影响的 cmark-gfm 库版本的应用程序中的远程代码执行 (RCE)。

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