CVE-2026-84963
CVE-2026-84963 is a medium-severity vulnerability in Mongodb C Driver with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-681.
Key facts
- Severity: Medium (CVSS 3.x base score 5.3)
- CVSS v4: 6.3
- EPSS exploit prediction: 0% (22nd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-681
- Affected product: Mongodb C Driver
- Published:
- Last modified:
Description
An incorrect numeric conversion in the JSON parsing component of the MongoDB C Driver's BSON library may cause an unusually large text value to be silently shortened, or the corresponding field to be omitted, while the parsing operation still reports success and returns no error. An unauthenticated party who can supply the input processed by an application that uses this component may cause that application to hold data that does not match what was submitted, which may result in unintended alteration of data.
Frequently asked questions
- What is CVE-2026-84963?
- An incorrect numeric conversion in the JSON parsing component of the MongoDB C Driver's BSON library may cause an unusually large text value to be silently shortened, or the corresponding field to be omitted, while the parsing operation still reports success and returns no error. An unauthenticated party who can supply the input processed by an application that uses this component may cause that application to hold data that does not match what was submitted, which may result in unintended alteration of data.
- How severe is CVE-2026-84963?
- CVE-2026-84963 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
- Is CVE-2026-84963 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-84963?
- CVE-2026-84963 affects Mongodb C Driver. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-84963?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2026-84963 published?
- CVE-2026-84963 was published on 2026-09-03 and last updated on 2026-09-22.
References
Affected products (1)
- cpe:2.3:a:mongodb:c_driver:*:*:*:*:*:mongodb:*:*
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