CVE-2026-84963

mediumpriority · track · 0EPSS 0.003 · 24 %ileDEUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.31% (24th) EPSS

CVSS 5.3 · medium

Is it mine?

11 products

Check your exposure

Who says so?

2 sources

cert_bund · nvd

EPSS · scored 2026-10-27

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

Technical severity, 0–10. One row per scoring source.

6.3

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 1.7–6.3

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Nsecondary · cna@mongodb.comexploitability 3.9 · impact 1.4

v4.06.3mediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · cna@mongodb.com

v4.01.7lowCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-681US

affected products (11)

Products and version ranges known to be affected.

Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
Fedora Linuxall versionscert_bundDEcpe:/o:fedoraproject:fedora:-
Open Source MongoDB≤ C Driver <2.5.2cert_bundDE
Open Source MongoDB≤ C++ Driver <4.5.2cert_bundDE
Open Source MongoDB≤ PHP Driver <2.5.1cert_bundDE
Open Source MongoDB≤ for VS Code <1.17.1cert_bundDE
Open Source MongoDB≤ libmongocrypt <1.20.2cert_bundDE
Open Source MongoDB≤ PHP Driver <1.21.8cert_bundDE
Open Source MongoDB≤ C Driver <1.30.9cert_bundDE
mongodb c driver1.10.0 → 1.30.9nvdUScpe:2.3:a:mongodb:c_driver:*:*:*:*:*:*:*:*
mongodb c driver2.0.0 → 2.5.2nvdUScpe:2.3:a:mongodb:c_driver:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-3209MongoDB: Mehrere SchwachstellenDeutsch2026-09-06csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in MongoDB ausnutzen, um einen Denial of Service zu verursachen, Daten zu manipulieren, Informationen offenzulegen oder beliebige Befehle über die MongoDB-Erweiterung für Visual Studio Code auszuführen.

sources

Which sources assert this record, and when.

cert_bund nvd NVD CVE.org MITRE

published 2026-09-03modified 2026-09-22

references (1) nvd

External citations — patches, advisories, analysis.

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

scry

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