TI-2026-27354 Aliases CVE-2026-35201 GHSA-6r34-94wq-jhrc

Discount has an Out-of-bounds Read in rdiscount

MEDIUM 60CWE-125Published 2026-04-06 · Updated 2026-04-07

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: High
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-125 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00285 21st percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed rdiscount (davidfstr): 2.2.7.4rdiscount (RubyGems): 2.2.7.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
davidfstr	rdiscount	1.3.1.1 to before 2.2.7.4	2.2.7.4	Patch available	CNA
—	rdiscount (RubyGems)	1.3.1.1 to before 2.2.7.4	2.2.7.4	Patch available	GHSA-6r34-94wq-jhrc

rdiscount Vendordavidfstr Affected 1.3.1.1 to before 2.2.7.4 Fixed in 2.2.7.4 Patch available CNA
rdiscount (RubyGems) Vendor— Affected 1.3.1.1 to before 2.2.7.4 Fixed in 2.2.7.4 Patch available GHSA-6r34-94wq-jhrc

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:dafoster:rdiscount::::::ruby::*	1.3.1.1 to before 2.2.7.4	Vulnerable	Dafoster

cpe:2.3:a:dafoster:rdiscount:*:*:*:*:*:ruby:*:* Versions 1.3.1.1 to before 2.2.7.4 Vulnerable ·Dafoster

Remediation

Fix · CNA rdiscount (davidfstr) Fixed in 2.2.7.4
Fix · GHSA-6r34-94wq-jhrc rdiscount (RubyGems) Fixed in 2.2.7.4 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-35201
2026-10-03 Alias added: GHSA-6r34-94wq-jhrc

References

Exploit 1

https://github.com/davidfstr/rdiscount/security/advisories/GHSA-6r34-94wq-jhrc

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-35201

Other 4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences