CVE-2026-4833 | Orc discount up to 3.0.1.2 Markdown markdown.c compile recursion (Issue 305)

VDB-353138 · CVE-2026-4833 · ISSUE 305 ORC DISCOUNT UP TO 3.0.1.2 MARKDOWN MARKDOWN.C COMPILE RECURSION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 3.2 $0-$5k 1.36+ Summaryinfo A vulnerability, which was classified as problematic, was found in Orc discount up to 3.0.1.2. Impacted is the function compile of the file markdown.c of the component Markdown Handler. Such manipulation leads to recursion. This vulnerability is listed as CVE-2026-4833. The attack must be carried out locally. In addition, an exploit is available. 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." Detailsinfo A vulnerability was found in Orc discount up to 3.0.1.2 and classified as problematic. Affected by this issue is the function compile of the file markdown.c of the component Markdown Handler. The manipulation with an unknown input leads to a recursion vulnerability. Using CWE to declare the problem leads to CWE-674. The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack. Impacted is availability. The advisory is available at github.com. This vulnerability is handled as CVE-2026-4833. The exploitation is known to be easy. Local access is required to approach this attack. Technical details as well as a public exploit are known. The exploit is available at github.com. It is declared as proof-of-concept. 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." There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product. Productinfo Vendor Orc Name discount Version 3.0.1.0 3.0.1.1 3.0.1.2 Website Product: https://github.com/Orc/discount/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 3.3 VulDB Meta Temp Score: 3.2 VulDB Base Score: 3.3 VulDB Temp Score: 3.2 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Recursion CWE: CWE-674 / CWE-404 CAPEC: 🔒 ATT&CK: 🔒 Physical: Partially Local: Yes Remote: No Availability: 🔒 Access: Public Status: Proof-of-Concept Download: 🔒 Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: no mitigation known Status: 🔍 0-Day Time: 🔒 Timelineinfo 03/25/2026 Advisory disclosed 03/25/2026 +0 days VulDB entry created 03/25/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: 305 Status: Confirmed Confirmation: 🔒 CVE: CVE-2026-4833 (🔒) GCVE (CVE): GCVE-0-2026-4833 GCVE (VulDB): GCVE-100-353138 scip Labs: https://www.scip.ch/en/?labs.20161013 Entryinfo Created: 03/25/2026 15:24 Changes: 03/25/2026 15:24 (59) Complete: 🔍 Submitter: MTHG Cache ID: 99:2F4:101 Submitinfo Accepted Submit #775841: Orc discount 3.0.1.2 Memory Corruption (by MTHG) Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸