CVE-2026-11933: A use-after-free vulnerability exists in MongoDB Server's server-side JavaScript engine when converting BSON d

Routine

HIGH 8.8UPGRADE

CVE-2026-11933 is a high-severity flaw (CVSS 8.8) affecting mongodb. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A use-after-free vulnerability exists in MongoDB Server's server-side JavaScript engine when converting BSON documents to JavaScript arrays. An authenticated user with read privileges who is able to run server-side JavaScript (for example, via $where or $function) can cause the server to access memory that has already been freed. This may result in disclosure of information from the mongod process memory or a denial of service through a server cr

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 68%)
CISA exploited list	No
Weakness	CWE-787, CWE-416
Published	2026-06-12
Last modified	2026-06-22

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

Last updated 2026-06-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-12 02:16 UTCPublished CVE record published
2026-06-22 14:38 UTCUpdated Record last modified

mongodb mongodb UPGRADE

Affected: >= 4.4.0 and < 4.4.31 · >= 5.0.0 and < 5.0.34 · >= 6.0.0 and < 6.0.29 · >= 7.0.0 and < 7.0.37 · >= 8.0.0 and < 8.0.26 · >= 8.2.0 and < 8.2.11 · >= 8.3.0 and < 8.3.4

Fixed in: 4.4.31, 5.0.34, 6.0.29, 7.0.37, 8.0.26, 8.2.11, 8.3.4

Safe to downgrade to: a release before 4.4.0

1. Check installed version

apt-cache policy mongodb || rpm -q mongodb || mongodb --version

2. UPGRADE to 4.4.31 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mongodb

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mongodb

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 4.4.0 (Debian / Ubuntu)

apt-cache madison mongodb sudo apt install mongodb=<VERSION_BEFORE_4.4.0> sudo apt-mark hold mongodb

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

dnf --showduplicates list mongodb sudo dnf downgrade mongodb-<VERSION_BEFORE_4.4.0> sudo dnf versionlock add mongodb

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-2026-11933?

mongodb: upgrade to 4.4.31, 5.0.34, 6.0.29, 7.0.37, 8.0.26, 8.2.11, 8.3.4. Exact commands for each OS are on this page.

Is CVE-2026-11933 being exploited?

CVE-2026-11933 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-2026-11933 affect?

CVE-2026-11933 affects mongodb. Severity is high (CVSS 8.8). A use-after-free vulnerability exists in MongoDB Server's server-side JavaScript engine when converting BSON documents to JavaScript arrays. An authenticated user with read privileges who is able to run server-side JavaScript (for example,

How urgent is CVE-2026-11933?

Priority 39/100. High severity

Software pages

MongoDB vulnerabilities

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References

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