CVE-2026-81521

mediumpriority · track · 0EPSS 0.002 · 15 %ileDEUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.24% (15th) EPSS

CVSS 6.5 · medium

Is it mine?

14 products

Check your exposure

Who says so?

2 sources

cert_bund · nvd

EPSS · scored 2026-10-28

The MongoDB Go Driver's client-level bulk write operation may accept a caller-supplied database name containing a reserved separator character without escaping it before the name is used to build the target namespace for the operation. An application that passes untrusted input as a database name could therefore have the write directed at a database and collection other than the ones it intended. Only the Client.BulkWrite API is affected.

cvss

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

7.1

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.9–7.1

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:Nsecondary · cna@mongodb.comexploitability 2.8 · impact 3.6

v4.07.1highCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/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

v4.04.9mediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/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-99US

affected products (14)

Products and version ranges known to be affected.

Fedora Linuxall versionscert_bundDEcpe:/o:fedoraproject:fedora:-
SUSE openSUSEall versionscert_bundDEcpe:/o:suse:opensuse:-
Open Source MongoDB≤ BI Connector <2.14.30cert_bundDE
Open Source MongoDB≤ C Driver <2.5.1cert_bundDE
Open Source MongoDB≤ C# Driver <3.11.1cert_bundDE
Open Source MongoDB≤ C++ Driver <4.5.1cert_bundDE
Open Source MongoDB≤ GO Driver <2.8.2cert_bundDE
Open Source MongoDB≤ PHP Driver <1.21.6cert_bundDE
Open Source MongoDB≤ PHP Driver <2.4.1cert_bundDE
Open Source MongoDB≤ PHP Library <1.21.4cert_bundDE
Open Source MongoDB≤ PHP Library <2.4.1cert_bundDE
Open Source MongoDB≤ Rust Driver <3.8.2cert_bundDE
Open Source MongoDB≤ libmongocrypt <1.20.3cert_bundDE
mongodb go driver2.1.0 → 2.8.2nvdUScpe:2.3:a:mongodb:go_driver:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-3066MongoDB Clients: Mehrere SchwachstellenDeutsch2026-08-27csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in verschiedenen MongoDB Clients ausnutzen, um Sicherheitsvorkehrungen zu umgehen, vertrauliche Informationen offenzulegen, Daten zu manipulieren oder Denial-of-Service-Zustände herbeizuführen.

sources

Which sources assert this record, and when.

cert_bund nvd NVD CVE.org MITRE

published 2026-08-27modified 2026-08-28

references (2) nvd

External citations — patches, advisories, analysis.

scry

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