CVE-2026-84963

medium

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 sho…

Vendor / product: Mongodb — c driver

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.

CVSS

5.3

5.3 (CVSS v3.1)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Severity source: NVD CVSS v3.1 (cna@mongodb.com)

Timeline (UTC)

Published: 2026-09-03 16:18

Modified: 2026-09-22 16:22

NVD status: Analyzed

Last synced 1 day ago

Verified against the source API 2026-10-27 06:50 UTC

Exploitation

Not listed in CISA KEV (as of last catalog sync)

Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).

Affected products

mongodb / c_driver ≥1.10.0 <1.30.9, ≥2.0.0 <2.5.2

Weakness classification (CWE)

CWE-681

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

Mitigation & advisories

Vendor advisory: https://jira.mongodb.org/browse/CDRIVER-6407

References

https://jira.mongodb.org/browse/CDRIVER-6407 cna@mongodb.com

Data sources

NVD CVE API 2.0 — fetched 2026-10-27 06:50 UTC · record ↗

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CVE-2026-84963

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Data sources

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