CVE-2026-84965
Last modified
CVE-2026-84965 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. An integer wraparound in an allocation size calculation in the BSON library's JSON parsing code can cause a buffer to be released while a following copy operation still writes through the stale pointer. On builds where sizes are 32 bits, an unauthenticated party able to supply a sufficiently large JSON input to an application that links the library may cause that application to terminate unexpectedly, resulting in denial of service.. EPSS estimates a 0.10% chance of exploitation in the next 30 days.
Description
An integer wraparound in an allocation size calculation in the BSON library's JSON parsing code can cause a buffer to be released while a following copy operation still writes through the stale pointer. On builds where sizes are 32 bits, an unauthenticated party able to supply a sufficiently large JSON input to an application that links the library may cause that application to terminate unexpectedly, resulting in denial of service.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mongodb | C Driver | >= 1.10.0, < 1.30.9 |
| Mongodb | C Driver | >= 2.0.0, < 2.5.2 |
References
- https://jira.mongodb.org/browse/CDRIVER-6405Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-84965?
How severe is CVE-2026-84965?
How do I fix CVE-2026-84965?
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-2026-8496A cross-site scripting (XSS) vulnerability exists in Alinto …6.1
- CVE-2026-84960The WP-Members Membership Plugin plugin for WordPress is vul…6.1
- CVE-2026-84961undici's BalancedPool constructor passes its entire options …9.1
- CVE-2026-84962An unauthorized user with key vault write access may cause a…4.2
- CVE-2026-84963An incorrect numeric conversion in the JSON parsing componen…5.3
- CVE-2026-84964A double free in the OpenSSL-based TLS certificate revocatio…7.5
- CVE-2026-84966An incorrect numeric type conversion in the BSON document bu…5.5
- CVE-2026-84967A component of the MongoDB extension for Visual Studio Code …4.3
- CVE-2026-84968An out-of-bounds read in the BSON decoding component of the …5.3
- CVE-2026-84969A memory-handling error in the BSON-to-JSON conversion helpe…3.7
- CVE-2026-8497Improper certificate validation in the Devolutions Server co…7.4
- CVE-2026-84970A numeric truncation weakness exists in the JSON parsing com…5.8
Are you affected by CVE-2026-84965?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST