CVE-2026-88032Network attack vector

Application crash via reactive encryption cancellation race

Published Sep 10, 2026 · Updated Sep 10, 2026

Use-after-free in MongoDB Java Driver 4.2.0 through 5.11.0 allows remote attackers to crash hosting applications via cancellation. A cancellation race frees native encryption resources before the affected reactive operation stops using them. Exposure requires reactive client-side encryption configured to retrieve KMS credentials on demand; the documented consequence is process termination.

CVSS severity8.2
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Use-after-free in MongoDB Java Driver 4.2.0 through 5.11.0 allows remote attackers to crash hosting applications via cancellation. A cancellation race frees native encryption resources before the affected reactive operation stops using them. Exposure requires reactive client-side encryption configured to retrieve KMS credentials on demand; the documented consequence is process termination.

The record

CVE
CVE-2026-88032
Published
Sep 10, 2026
Updated
Sep 10, 2026
Vendor
MongoDB
Product
mongodb-crypt
Classifications
CWE-416, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=1.4.0 <5.11.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MongoDB · mongodb-cryptversion=1.4.0 <5.11.1
MongoDB · MongoDB Java Driverversion=4.2.0 <5.11.1
MongoDB · MongoDB Java Reactive Streams Driverversion=4.6.0 <5.11.1

Published CVSS scores

5.9MongoDB CNACVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
8.2MongoDB CNACVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo