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

> A local attacker can cause a crash in the Orc discount Markdown library by providing deeply nested blockquote input, leading to denial of service.

- **Severity:** Medium 4.8 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 26 Mar 2026
- **Updated:** 30 Mar 2026
- **Also known as:** AZL-81020, AZL-81062, DEBIAN-CVE-2026-4833, GHSA-9f9p-gp89-cxxh, UBUNTU-CVE-2026-4833, openSUSE-SU-2026:11786-1

## What is CVE-2026-4833?

CVE-2026-4833 is a medium-severity denial of service vulnerability in Orc discount, published on 26 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official 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."

Weakness: CWE-674 (Uncontrolled Recursion), CWE-404 (Improper Resource Shutdown or Release)

## Which versions are affected by CVE-2026-4833?


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `discount` | openSUSE:Tumbleweed | All versions | 3.0.2.0-1.1 |

## How do I fix CVE-2026-4833?

Apply the vendor's patch.

## Is CVE-2026-4833 being exploited?

There is no known exploitation of CVE-2026-4833 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4833 and fix it if it is affected.

What it is: CVE-2026-4833 is a medium-severity denial of service vulnerability in Orc discount, published on 26 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-4833 in the wild and no public exploit code.

Affected product: Orc discount. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-4833/ (Markdown: https://insights.sbomify.com/CVE-2026-4833/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4833
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4833
- OSV: https://osv.dev/vulnerability/CVE-2026-4833

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-4833/
Summaries are generated and may contain mistakes; the official description above is the record.