CVE-2026-38999 Details
Description
A Null Pointer Dereference in the mk_sched_event_close function (mk_server/mk_scheduler.c) of Monkey through commit 4fb0c16 allows attackers to cause a Denial of Service (DoS) via sending a crafted HTTP request to the server.
A null pointer dereference vulnerability has been identified in the Monkey HTTP Server, specifically in the 'mk_sched_event_close' function within 'mk_server/mk_scheduler.c', in versions prior to the commit '4fb0c16'. This vulnerability allows attackers to cause a denial-of-service condition by sending a crafted HTTP request that includes specific headers to upgrade the connection to HTTP/2. When the server processes this request, it attempts to call a function pointer that is null, leading to a crash.
Users can update to the version of Monkey HTTP Server that includes the patch for this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 16, 2026CISA-ADP
Assessed Sep 22, 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/monkey/monkey/issues/427 | CISA-ADP | ExploitIssue TrackingTechnical DescriptionVendor |
| https://github.com/archersec/security-advisories/blob/master/monkey/monkey-advisory-2026.md | [email protected] | AdvisoryRemedy |
| https://github.com/monkey/monkey/issues/427 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-476 | NULL Pointer Dereference | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| Monkey | <= 4fb0c16 |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 22, 2026 | CVE Modified | CISA-ADP |
| Sep 16, 2026 | New CVE Received | [email protected] |
Volerion