CVE-2026-39042
Last modified
CVE-2026-39042 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. An issue in MikroTIk (SIA Mikrotikls, Latvia) RouterOS 7.21.x before v.7.21.4 and 7.22.x before v.7.22.2 allows a remote attacker to cause a denial of service via the unflatten() function in libumsg.so.. EPSS estimates a 0.41% chance of exploitation in the next 30 days.
Description
An issue in MikroTIk (SIA Mikrotikls, Latvia) RouterOS 7.21.x before v.7.21.4 and 7.22.x before v.7.22.2 allows a remote attacker to cause a denial of service via the unflatten() function in libumsg.so.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| — | — | n/a |
References
Timeline
- Published
- Last Modified
- Status
- Deferred
Frequently Asked Questions
What is CVE-2026-39042?
How severe is CVE-2026-39042?
How do I fix CVE-2026-39042?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-39006An issue in SNMP4J-Agent 3.8.3 allows a remote attacker to e…9.8
- CVE-2026-39007An issue in Observeinc's Observe v.2026-01-28 and before all…7.5
- CVE-2026-3902An issue was discovered in 6.0 before 6.0.4, 5.2 before 5.2.…7.5
- CVE-2026-3903The Modular DS: Monitor, update, and backup multiple website…4.3
- CVE-2026-39031Lansweeper lsrunase 2.0 and lsencrypt 2.0 use RC4 encryption…5.5
- CVE-2026-3904Calling NSS-backed functions that support caching via nscd m…6.2
- CVE-2026-39047Buffer Overflow vulnerability in EPSON L14150 FL27PB allows …7.5
- CVE-2026-39052Oinone Pamirs 7.0.0 contains a code execution vulnerability …6.5
- CVE-2026-39053Oinone Pamirs 7.0.0 contains an XML External Entity (XXE) is…6.5
- CVE-2026-39054Oinone Pamirs 7.0.0 contains a command injection vulnerabili…7.3
- CVE-2026-3906WordPress core is vulnerable to unauthorized access in versi…4.3
- CVE-2026-3907The Hostel plugin for WordPress is vulnerable to Stored Cros…6.4
Are you affected by CVE-2026-39042?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST