CVE-2026-88032: A use-after-free in the reactive client-side encryption component of the MongoDB Java Driver can cause native

Routine

MEDIUM 5.9REMOTEUPGRADE

CVE-2026-88032 is a medium-severity flaw (CVSS 5.9) affecting java driver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 83%)
CISA exploited list	No
Weakness	CWE-416
Published	2026-09-10
Last modified	2026-09-16

Publisher (CNA): MongoDB, Inc. · Vendor: mongodb

Last updated 2026-09-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-10 19:17 UTCPublished CVE record published
2026-09-16 15:51 UTCUpdated Record last modified

mongodb java driver UPGRADE

Affected: >= 4.2.0 and < 5.11.1

Fixed in: 5.11.1

Safe to downgrade to: a release before 4.2.0

1. Check installed version

apt-cache policy java-driver || rpm -q java-driver || java-driver --version

2. UPGRADE to 5.11.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade java-driver

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade java-driver

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 4.2.0 (Debian / Ubuntu)

apt-cache madison java-driver sudo apt install java-driver=<VERSION_BEFORE_4.2.0> sudo apt-mark hold java-driver

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list java-driver sudo dnf downgrade java-driver-<VERSION_BEFORE_4.2.0> sudo dnf versionlock add java-driver

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-88032?

java driver: upgrade to 5.11.1. Exact commands for each OS are on this page.

Is CVE-2026-88032 being exploited?

CVE-2026-88032 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-88032 affect?

CVE-2026-88032 affects java driver. Severity is medium (CVSS 5.9). 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 c

How urgent is CVE-2026-88032?

Priority 30/100. Remotely exploitable, no login, no user action

Software pages

Java vulnerabilities · MongoDB vulnerabilities

Related CVEs

CVE-2026-18710 MEDIUM 6.5 UPGRADE A MongoDB driver component could write sensitive configuration information, including a credential used for ou
CVE-2026-88033 HIGH 8.3 UPGRADE Improper neutralization of special elements in data query logic in the GridFS component of the MongoDB Java Dr

References

← Back to latest CVEs