CVE-2026-106433

highpriority · track · 0EPSS 0.003 · 19 %ileDEUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.27% (19th) EPSS

CVSS 8.8 · high

Is it mine?

7 products

Check your exposure

Who says so?

2 sources

cert_bund · nvd

EPSS · scored 2026-10-27

Improper state management in MongoDB libmongocrypt can cause provider-specific data to be treated as an incompatible type when cleaning up a key document containing duplicate masterKey fields. An authenticated actor who can modify key vault documents, or a server that returns such a key document, can cause invalid memory access and invalid frees in the client process. This can terminate the application or corrupt process memory.

cvss

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

8.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.3–8.8

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · cna@mongodb.comexploitability 2.8 · impact 5.9

v4.08.7highCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/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

v4.06.3mediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/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)

ssvc

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

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-843US

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 libmongocryptall versionscert_bundDEcpe:/a:mongodb:mongodb:libmongocrypt
mongodb libmongocrypt1.5.0 → 1.20.5nvdUScpe:2.3:a: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 NVD CVE.org MITRE

published 2026-10-08modified 2026-10-27

references (1) nvd

External citations — patches, advisories, analysis.

https://jira.mongodb.org/browse/MONGOCRYPT-964Vendor AdvisoryIssue Tracking

scry

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