Which versions of Discount are affected by CVE-2026-4833?

Organizations using Orc discount should be aware of moderate risk from CVE-2026-4833 rated CVSS 4.8. Exploitation could compromise the security of affected deployments.

Is there a public PoC exploit available for CVE-2026-4833?

Yes, a public proof-of-concept exploit is available for CVE-2026-4833. Prioritise patching immediately. EPSS: 0.0%.

Discount CVE-2026-4833

Q: What is the CVSS score of CVE-2026-4833?

CVE-2026-4833 has a CVSS 4.0 base score of 1.9 (Low). CVSS vector: 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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.0%.

EUVD-2026-16078 LOW

Uncontrolled Recursion (CWE-674)

2026-03-26 VulDB

Denial Of Service Discount

1.9

CVSS 4.0 · NVD

Temporal: 3.2

Severity by source

NVD PRIMARY

1.9 LOW

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CIRCL (temporal)

3.2 LOW

cvss

Primary rating from NVD.

CVSS VectorNVD

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Lifecycle Timeline

Severity Changed

Apr 29, 2026 - 01:11 NVD

MEDIUM LOW

CVSS changed

Apr 29, 2026 - 01:11 NVD

4.8 (MEDIUM) 1.9 (LOW)

PoC Detected

Mar 30, 2026 - 13:26 vuln.today

Public exploit code

EUVD ID Assigned

Mar 26, 2026 - 01:45 euvd

EUVD-2026-16078

Analysis Generated

Mar 26, 2026 - 01:45 vuln.today

CVE Published

Mar 26, 2026 - 01:02 nvd

MEDIUM 4.8

DescriptionCVE.org

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."

AnalysisAI

Uncontrolled recursion in the Markdown Handler component of Orc discount up to version 3.0.1.2 causes denial of service through malformed deeply-nested blockquote inputs, affecting local users who process untrusted markdown files. Public exploit code exists for this vulnerability, and no patch is currently available. …

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Vulnerability AssessmentAI

Risk Assessment	The CVSS 3.1 vector (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L) indicates low overall severity: local attack vector, low complexity, low privilege requirement, no confidentiality or integrity impact, only availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	A local user with access to a document processing system (e.g., a continuous integration pipeline, documentation build server, or shared content management platform running discount) submits a specially crafted Markdown file containing deeply nested blockquotes. The publicly available proof-of-concept file (crash00.md, referenced at https://github.com/user-attachments/files/25847391/crash00.md) triggers the parser to recurse uncontrollably. …
Remediation	Users should upgrade to a patched version of Orc discount newer than 3.0.1.2 once available; however, as of the CVE report date, the project maintainer has not released a confirmed fix (the project status shows this as a duplicate of a previously identified but unresolved bug). … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 30 days: Identify affected systems running Orc discount and apply vendor patches as part of regular patch cycle. …

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CVE-2026-4833 vulnerability details – vuln.today

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