CVE-2026-106434

mediumpriority · track · 0EPSS 0.001 · 1 %ileDE

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.11% (1st) EPSS

CVSS 4.3 · medium

Is it mine?

7 products

Check your exposure

Who says so?

1 sources

cert_bund

EPSS · scored 2026-10-28

The explicit decryption component of MongoDB libmongocrypt can return an unrecognized encrypted payload unchanged instead of returning a decryption error. An actor who can modify stored encrypted fields, such as a database writer, server, or network intermediary, can cause an affected application to process the supplied bytes as decrypted plaintext.

cvss

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

5.3

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 1.3–5.3

v3.14.3mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:Nsecondary · cna@mongodb.comexploitability 2.8 · impact 1.4

v4.05.3mediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/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

v4.01.3lowCVSS:4.0/AV:N/AC:L/AT:N/PR:L/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.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-354US

affected products (7)

Products and version ranges known to be affected.

Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
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 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/MONGOCRYPT-966

scry

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