Integer overflow in table parsing extension leads to heap memory corruption
Summary
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 Version(s)
cmark-gfm < 0.28.3.gfm.21
cmark-gfm < 0.29.0.gfm.0, 0.29.0.gfm.3
EPSS Score
7% chance of being exploited in the next 30 days.
CVSS V3.1
Timeline
Risk change from: 9.8 to: 8.8 - (HIGH)
Vulnerability published.
Vulnerability Reserved.