CVE-2026-106431

mediumpriority · track · 0EPSS 0.001 · 1 %ileDE

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.10% (1st) EPSS

CVSS 5.7 · medium

Is it mine?

7 products

Check your exposure

Who says so?

1 sources

cert_bund

EPSS · scored 2026-10-27

An off-by-one error in the BSON bulk document writer in the MongoDB C Driver can write one zero byte immediately past a heap allocation when a document ends at a specific buffer boundary. An actor who can influence the size of documents serialized by an embedding application can corrupt adjacent process memory or terminate the process. Reaching this issue requires the application to use the BSON bulk-writer API and produce a precise cumulative document size.

cvss

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

5.9

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 2.1–5.9

v3.15.7mediumCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:Hsecondary · cna@mongodb.comexploitability 1.4 · impact 4.2

v4.05.9mediumCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/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

v4.02.1lowCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/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)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-787US

affected products (7)

Products and version ranges known to be affected.

Fedora Linuxall versionscert_bundDEcpe:/o:fedoraproject:fedora:-
Microsoft Azure Linux azl3all versionscert_bundDEcpe:/o:microsoft:azure_linux:azl3
Open Source MongoDB C# Driverall versionscert_bundDEcpe:/a:mongodb:mongodb:c_driver
Open Source MongoDB Go Driverall versionscert_bundDEcpe:/a:mongodb:mongodb:go_driver
Open Source MongoDB PHP Driverall versionscert_bundDEcpe:/a:mongodb:mongodb:php_driver
Open Source MongoDB Python Driverall versionscert_bundDEcpe:/a:mongodb:mongodb:python_driver
Open Source MongoDB libmongocryptall versionscert_bundDEcpe:/a:mongodb:mongodb:libmongocrypt

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-3830MongoDB Treiber: Mehrere SchwachstellenDeutsch2026-10-08csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in verschiedenen MongoDB Treibern ausnutzen, um einen Denial of Service Angriff durchzuführen und um Daten zu manipulieren.

sources

Which sources assert this record, and when.

cert_bund NVD CVE.org MITRE

published 2026-10-08modified 2026-10-08

references (1) nvd

External citations — patches, advisories, analysis.

https://jira.mongodb.org/browse/CDRIVER-6418

scry

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