CVE-2022-24724: Fedoraproject Fedora

Critical severity, CVSS 9.8. EPSS: 4.5% chance of exploitation in the next 30 days.

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.

Affected products

• Fedoraproject Fedora: version 34 only; version 35 only; version 36 only
• GitHub Cmark-Gfm: before 0.28.3.gfm.21 (fixed in 0.28.3.gfm.21); after 0.28.3.gfm.21, before 0.29.0.gfm.3 (fixed in 0.29.0.gfm.3)

Published 2022-03-03. Last modified 2026-06-17.