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CVE-2026-38999

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-16 · updated 2026-09-22
• Weakness: CWE-476

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.

References

• https://github.com/archersec/security-advisories/blob/master/monkey/monkey-advisory-2026.md
• https://github.com/monkey/monkey/issues/427
• https://github.com/monkey/monkey/issues/427

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