CVE-2026-82064

Unauthenticated Denial of Service in MongoDB Server via Assertion Failure in Read Concern Processing on Replica Set Members

State: Published
Severity: 8.7 High
Published: Sep 8, 2026
Updated: Sep 8, 2026
Reserved: Aug 27, 2026

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Description

A security issue in MongoDB Server allows an unauthenticated network user to cause a denial of service on a specific type of replica set member. The server contains an assertion in its read concern processing logic that can be reached without authentication, and the assertion's assumptions about internal state do not hold for all member configurations, causing the server process to terminate.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	mongodb
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	mongodb

Weaknesses

CWE-617 Reachable Assertion

Affected Products

Product	Versions
MongoDB ServerMongoDB	8.3.0 to before 8.3.9Affected 8.0.0 to before 8.0.30Affected 7.0.0 to before 7.0.41Affected

References

https://jira.mongodb.org/browse/SERVER-130759

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