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Fencer Vulns
medium 5.9

CVE-2026-88032 json

Application denial of service via cancellation race in reactive client-side encryption in MongoDB Java Driver

published 2026-09-10 59 d ago modified 2026-09-16 54 d ago also EUVD-2026-75668

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 17%
public exploits
0
none known

Summary

A use-after-free in the reactive client-side encryption component of the MongoDB Java Driver can cause native resources to be freed while an affected encrypted operation is still using them when the operation is cancelled. A party able to cause such an operation to be cancelled may cause the hosting application process to terminate. Reaching the issue requires an affected reactive encryption configuration that retrieves KMS credentials on demand.

Patch / fix

  • MongoDB Java Driver 5.11.1
  • MongoDB org.mongodb:mongodb-crypt Maven package 5.11.1
  • MongoDB org.mongodb:mongodb-driver-reactivestreams Maven package 5.11.1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-88032 updated cvss 5.9

mongodb-java-driver: mongodb-driver-reactivestreams: mongodb-crypt: MongoDB Java Driver: Denial of Service via use-after-free in client-side encryption cancellation

  • Red Hat Exploit Intelligence exploit-intelligence/agent-client-rhel9 Red Hat build of Apache Camel 4 for Quarkus 3 mongodb-crypt
    affected: workaround, no fix available “Fix deferred”
  • Red Hat build of Quarkus 3.27.6.redhat mongodb-crypt 5.5.1.redhat-00003
    fixed: vendor fix RHSA-2026:83082
  • Red Hat build of Quarkus 3.33.4.redhat mongodb-crypt 5.6.4.redhat-00002
    fixed: vendor fix RHSA-2026:83520
  • Red Hat build of Quarkus 3.27.6.redhat jna 5.8.0, db2 1.21.4, h2 2.3.230, y18n 5.0.8, cliui 8.0.1, guice 5.1.0, +1009 more Red Hat build of Quarkus 3.33.4.redhat jna 5.8.0, h2 2.4.240, y18n 5.0.8, cliui 8.0.1, guice 5.1.0, wasm 2.15.3, +1016 more Red Hat Fuse 7 mongodb-crypt
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
59 d ago

Exploit prediction

0.26% chance of exploitation in the next 30 days, higher than 17% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.2 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 4.0 8.2 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • MongoDB Java Driver
  • MongoDB org.mongodb:mongodb-crypt Maven package
  • MongoDB org.mongodb:mongodb-driver-reactivestreams Maven package

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.