CVE-2026-4833 Details
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."
A stack exhaustion vulnerability has been identified in Orc Discount versions through 3.0.1.2. This issue resides in the Markdown Handler component, specifically within the compile function of markdown.c. The vulnerability allows for uncontrolled recursion, where the function can be tricked into processing excessively nested structures. This deep recursion exhausts the process stack, leading to a crash caused by a segmentation fault. The vulnerability requires local execution to exploit, and a public proof-of-concept exploit is available.
No specific mitigation is known, but it is suggested to introduce a maximum nesting depth limit in the parsing logic to prevent excessive recursion.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Mar 26, 2026CISA-ADP
Assessed Mar 30, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/Orc/discount/ | [email protected] | Source CodeVendor |
| https://github.com/Orc/discount/issues/305 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
| https://github.com/Orc/discount/issues/305#issuecomment-4027546673 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
| https://github.com/user-attachments/files/25847391/crash00.md | [email protected] | Broken LinkExploit |
| https://vuldb.com/?ctiid.353138 | [email protected] | Technical Description |
| https://vuldb.com/?id.353138 | [email protected] | AdvisoryExploitPartial Content |
| https://vuldb.com/?submit.775841 | [email protected] | Technical Description |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-404 | Improper Resource Shutdown or Release | [email protected] |
| CWE-674 | Uncontrolled Recursion | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Orc discount | 3.0.1.0 3.0.1.1 3.0.1.2 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 29, 2026 | Data Remediation | [email protected] |
| Mar 26, 2026 | New CVE Received | [email protected] |