Out-of-bounds Read in Dafoster Rdiscount
CVE-2026-35201
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (30.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 30.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- Dafoster Rdiscount
- Davidfstr Rdiscount — versions >= 1.3.1.1, < 2.2.7.4
Weakness classification (CWE)
References
- github.com/davidfstr/rdiscount/security/advisories/GHSA-6r34-94wq-jhrc (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-35201?
- CVE-2026-35201 is a medium-severity vulnerability in Dafoster Rdiscount, classified under Out-of-bounds Read. CVSS score: 5.9/10. Published 2026-04-06.
- How severe is CVE-2026-35201?
- Medium severity. CVSS v3 base score is 5.9 out of 10.