CVE-2026-35201 - Discount has an Out-of-bounds Read in rdiscount

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MEDIUM

Discount has an Out-of-bounds Read in rdiscount

Published Apr 6, 2026

5.9

MEDIUM

CVSS 3.1

EPSS 0.39%

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.

Affected products

Vendor Davidfstr Product Rdiscount Default
n/a
- Version
  >= 1.3.1.1, < 2.2.7.4
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Davidfstr

Rdiscount

n/a

Version	Status	Constraints
>= 1.3.1.1, < 2.2.7.4	affected	-

Remediation

No remediation recorded yet.

Weaknesses (1)

CWE-125

Out-of-bounds Read

References (6)

Link	Providers	Tags
http://github.com/davidfstr/rdiscount/releases/tag/2.2.7.4
https://github.com/advisories/GHSA-6r34-94wq-jhrc		Advisory
https://github.com/davidfstr/rdiscount/commit/b1a16445e92e0d12c07594dedcdc56f80b317761
https://github.com/davidfstr/rdiscount/security/advisories/GHSA-6r34-94wq-jhrc		x_refsource_CONFIRMExploitVendor Advisory
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rdiscount/CVE-2026-35201.yml
https://nvd.nist.gov/vuln/detail/CVE-2026-35201