Description
Discount is an implementation of John Gruber's Markdown markup language in C. From 1.3.1.1 to before 2.2.7.4, a signed length truncation bug causes an out-of-bounds read in the default Markdown parse path. Inputs larger than INT_MAX are truncated to a signed int before entering the native parser, allowing the parser to read past the end of the supplied buffer and crash the process. This vulnerability is fixed in 2.2.7.4.
Scores
CVSS v3
5.9
EPSS
0.0005
EPSS Percentile
16.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-125
Status
published
Products (3)
dafoster/rdiscount
1.3.1.1 - 2.2.7.4
davidfstr/rdiscount
>= 1.3.1.1, < 2.2.7.4
rubygems/rdiscount
1.3.1.1 - 2.2.7.4RubyGems
Published
Apr 06, 2026
Tracked Since
Apr 07, 2026