SB2026050487 - Multiple vulnerabilities in MongoDB Server

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Main Vulnerability Database SB2026050487

SB2026050487 - Multiple vulnerabilities in MongoDB Server

Published: May 4, 2026 Updated: August 18, 2026

Security Bulletin ID SB2026050487
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 25% Low 75%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 vulnerabilities.


1) Integer underflow (CVE-ID: CVE-2026-6914)

CWE-ID: CWE-191 - Integer underflow

CVSSv4: 8.7 [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]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to integer underflow in binDataClean() when computing the MD5 checksum of a malformed BSON object. A remote attacker can supply a malformed BSON object to cause a denial of service.


2) Missing Authorization (CVE-ID: CVE-2026-6915)

CWE-ID: CWE-862 - Missing Authorization

CVSSv4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to weaken another user's authentication configuration.

The vulnerability exists due to improper access control in the updateUser command when processing user update requests. A remote user can submit a crafted updateUser command to weaken another user's authentication configuration.

The issue allows downgrading any other user's authentication mechanism from SCRAM-SHA-256 to SCRAM-SHA-1.


3) NULL pointer dereference (CVE-ID: CVE-2026-8063)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to cause a denial of service.

The vulnerability exists due to null pointer dereference in the aggregation pipeline inspection logic for $rankFusion and $scoreFusion when resolving a view with an empty input pipeline array. A remote user can run $rankFusion or $scoreFusion with an empty pipeline on a view to cause a denial of service.


4) Reachable assertion (CVE-ID: CVE-2026-8843)

CWE-ID: CWE-617 - Reachable Assertion

CVSSv4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to cause a denial of service.

The vulnerability exists due to reachable assertion in index handling when inserting a document that triggers updating a previously created "2dsphere_bucket" or "queryable_encrypted_range" index. A remote user can create a crafted index and then insert a document to cause a denial of service.

The issue occurs when a "2dsphere_bucket" index is created on a non-timeseries bucket collection, and a similar condition exists for "queryable_encrypted_range" indices.


Remediation

Install update from vendor's website.

References