CVE-2026-84963Silent field truncation via unchecked int cast of huge JSON string values in JSON-to-BSON parser
Updated under an hour ago ()
Does this affect you?
It affects MongoDB C Driver. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- Weakness (CWE)
- CWE-681
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- mongodb
- NVD analysis
- Analyzed
- Record last updated
- Sep 3, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
MongoDB C Driver mongodb:c_driver (from the name) | from 1.10.0 before 1.30.9; from 2.0.0 before 2.5.2 | CNA record |
mongodb c_driver mongodb:c_driver | from 1.10.0 before 1.30.9; from 2.0.0 before 2.5.2 | NVD |
References
- https://jira.mongodb.org/browse/CDRIVER-6407vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.