CVE-2026-9747Network attack vector

Authenticated crash via duplicate userRoles initialization

Published Jun 9, 2026 · Updated Jun 9, 2026

Reachable assertion in MongoDB Server allows remote authenticated users to crash mongod through a crafted cross-shard aggregation request. The aggregation runtime-constant path treats router-derived and request-supplied userRoles data as the same query constant, so duplicate initialization reaches a fatal assertion. Network access and valid database credentials are required; the disclosed consequence is process termination and service interruption only.

CVSS severity7.1
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in MongoDB Server allows remote authenticated users to crash mongod through a crafted cross-shard aggregation request. The aggregation runtime-constant path treats router-derived and request-supplied userRoles data as the same query constant, so duplicate initialization reaches a fatal assertion. Network access and valid database credentials are required; the disclosed consequence is process termination and service interruption only.

The record

CVE
CVE-2026-9747
Published
Jun 9, 2026
Updated
Jun 9, 2026
Vendor
MongoDB
Product
MongoDB Server
Classifications
CWE-617, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.0.0 <7.0.35
  2. Affected versionversion=8.0.0 <8.0.24
  3. Affected versionversion=8.2.0 <8.2.10
  4. Affected versionversion=8.3.0 <8.3.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

MongoDB · MongoDB Serverversion=7.0.0 <7.0.35; version=8.0.0 <8.0.24; version=8.2.0 <8.2.10; version=8.3.0 <8.3.3

Published CVSS scores

7.1MongoDB, Inc.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
6.5MongoDB, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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