What’s Vulnerable › Vulnerabilities

CVE-2026-4833: Orc discount Markdown markdown.c compile recursion

• Severity: low (CVSS 3.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-26 · updated 2026-06-17
• Weakness: CWE-404

Description

A weakness has been identified in Orc discount up to 3.0.1.2. This issue affects the function compile of the file markdown.c of the component Markdown Handler. This manipulation causes uncontrolled recursion. The attack is restricted to local execution. The exploit has been made available to the public and could be used for attacks. The project maintainer confirms: "[I]f you feed it an infinitely deep blockquote input it will crash. (...) [T]his is a duplicate of an old bug that I've been working on."

Affected products

• Orc discount: 3.0.1.0, 3.0.1.1, 3.0.1.2

References

• https://github.com/Orc/discount/
• https://github.com/Orc/discount/issues/305
• https://github.com/Orc/discount/issues/305#issuecomment-4027546673
• https://github.com/user-attachments/files/25847391/crash00.md
• https://vuldb.com/?ctiid.353138
• https://vuldb.com/?id.353138
• https://vuldb.com/?submit.775841

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