CVE-2026-120811
Last modified
CVE-2026-120811 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. A use-after-free issue exists in the MongoDB server’s classic query engine plan cache. Under certain query conditions, an unowned reference to data from an earlier command can be retained in cached plan statistics. EPSS estimates a 0.26% chance of exploitation in the next 30 days.
Description
A use-after-free issue exists in the MongoDB server’s classic query engine plan cache. Under certain query conditions, an unowned reference to data from an earlier command can be retained in cached plan statistics. After the originating memory is freed, a subsequent diagnostic command serializing those statistics can read freed heap memory, potentially returning sensitive server process memory contents to the authenticated client. Under certain heap reuse conditions, this may also cause the server to crash.
Metrics
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| MongoDB | MongoDB Server | >= 9.0.0, < 9.0.7; >= 8.3.0, < 8.3.16; >= 8.0.0, < 8.0.37; >= 7.0.0, < 7.0.48 |
References
Timeline
- Published
- Last Modified
- Status
- Awaiting Analysis
Frequently Asked Questions
What is CVE-2026-120811?
How severe is CVE-2026-120811?
How do I fix CVE-2026-120811?
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-2026-120806A flaw in MongoDB Server's user management commands may lead…5.5
- CVE-2026-120807A flaw in MongoDB’s X.509 cluster-membership authentication …6.6
- CVE-2026-120808An issue exists in MongoDB's macOS TLS client implementation…7.4
- CVE-2026-120809A use-after-free read issue exists in MongoDB’s SBE (Slot-Ba…6.8
- CVE-2026-12081The Database for Contact Form 7, WPforms, Elementor forms Wo…5
- CVE-2026-120810An issue in MongoDB server’s aggregation framework allows an…6.5
- CVE-2026-120812An issue in MongoDB Server's query processing component allo…6.5
- CVE-2026-120813An issue in MongoDB Server's client-side field-level encrypt…5.9
- CVE-2026-120814An improper privilege management issue in the sharding subsy…7.2
- CVE-2026-120815An incorrect authorization check in the MongoDB Server autho…8.4
- CVE-2026-120816A user with basic read-tier database privileges can use an o…4.3
- CVE-2026-120817A race condition in the schema validation component of Mongo…6.5
Are you affected by CVE-2026-120811?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST