CVE-2026-11933Network attack vector

Information disclosure or crash via BSON ownership mismatch

Published Jun 12, 2026 · Updated Jun 12, 2026

Use-after-free in MongoDB Server allows remote authenticated users to read process memory or crash mongod through server-side JavaScript. The bsonObjToArray conversion applies ownership semantics that do not match bsonGetImmutable, leaving JavaScript array data able to reference freed BSON storage. Exploitation requires read privileges and enabled server-side JavaScript, such as $where or $function; consequences are process-memory disclosure or a server crash.

CVSS severity8.7
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in MongoDB Server allows remote authenticated users to read process memory or crash mongod through server-side JavaScript. The bsonObjToArray conversion applies ownership semantics that do not match bsonGetImmutable, leaving JavaScript array data able to reference freed BSON storage. Exploitation requires read privileges and enabled server-side JavaScript, such as $where or $function; consequences are process-memory disclosure or a server crash.

The record

CVE
CVE-2026-11933
Published
Jun 12, 2026
Updated
Jun 12, 2026
Vendor
MongoDB
Product
MongoDB Server
Classifications
CWE-787, CWE-416, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 12, 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=4.4.0 <=4.4.30
  2. Affected versionversion=5.0 <=5.0.33
  3. Affected versionversion=6.0 <=6.0.28
  4. Affected versionversion=7.0.0 <=7.0.36
  5. Affected versionversion=8.0.0 <=8.0.25
  6. Affected versionversion=8.2.0 <=8.2.10
  7. Affected versionversion=8.3.0 <=8.3.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

MongoDB · MongoDB Serverversion=4.4.0 <=4.4.30; version=5.0 <=5.0.33; version=6.0 <=6.0.28; version=7.0.0 <=7.0.36; version=8.0.0 <=8.0.25; version=8.2.0 <=8.2.10; version=8.3.0 <=8.3.3

Published CVSS scores

8.7MongoDB, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8MongoDB, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-416Use After Free
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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