CVE-2026-8843Network attack vector

Authenticated server crash via unsupported index creation

Published May 18, 2026 · Updated May 18, 2026

Reachable assertion in MongoDB Server 7.0 before 7.0.32, 8.0 before 8.0.21, and 8.2 before 8.2.6 allows remote authenticated users to crash mongod. Index creation accepts 2dsphere_bucket on a non-timeseries bucket collection and queryable_encrypted_range on unsupported collection types, leaving invalid index metadata that reaches an assertion during a later index update. The attacker needs privileges to create the invalid index and insert a document that updates it; the resulting assertion terminates the database server and interrupts service.

CVSS severity7.1
High
EPSS probability0.24%
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 7.0 before 7.0.32, 8.0 before 8.0.21, and 8.2 before 8.2.6 allows remote authenticated users to crash mongod. Index creation accepts 2dsphere_bucket on a non-timeseries bucket collection and queryable_encrypted_range on unsupported collection types, leaving invalid index metadata that reaches an assertion during a later index update. The attacker needs privileges to create the invalid index and insert a document that updates it; the resulting assertion terminates the database server and interrupts service.

The record

CVE
CVE-2026-8843
Published
May 18, 2026
Updated
May 18, 2026
Vendor
MongoDB
Product
MongoDB Server
Classifications
CWE-617, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 18, 2026CVE publishedPublication date reported by the CVE source.
  2. May 18, 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 <7.0.32
  2. Affected versionversion=8.0 <8.0.21
  3. Affected versionversion=8.2 <8.2.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

MongoDB · MongoDB Serverversion=7.0 <7.0.32; version=8.0 <8.0.21; version=8.2 <8.2.6

Published CVSS scores

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

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
T1499.004Application or System Exploitation

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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