CVE-2026-84962: An unauthorized user with key vault write access may cause an authorized client to issue arbitrary authenticat

Q: How do I fix CVE-2026-84962?

libmongocrypt: upgrade to 1.20.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-84962 being exploited?

CVE-2026-84962 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-84962 affect?

CVE-2026-84962 affects libmongocrypt. Severity is medium (CVSS 4.2). An unauthorized user with key vault write access may cause an authorized client to issue arbitrary authenticated Google Cloud KMS API calls under the authorized user's identity, escalating database-level access into cloud key control and de

Q: How urgent is CVE-2026-84962?

Priority 17/100. No elevated risk signals yet.

Routine

MEDIUM 4.2UPGRADE

CVE-2026-84962 is a medium-severity flaw (CVSS 4.2) affecting libmongocrypt. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An unauthorized user with key vault write access may cause an authorized client to issue arbitrary authenticated Google Cloud KMS API calls under the authorized user's identity, escalating database-level access into cloud key control and defeating client-side encryption.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.2 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-93
Published	2026-09-03
Last modified	2026-09-17

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

Last updated 2026-09-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-03 16:18 UTCPublished CVE record published
2026-09-17 14:00 UTCUpdated Record last modified

mongodb libmongocrypt UPGRADE

Affected: < 1.20.2

Fixed in: 1.20.2

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.20.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade libmongocrypt

Note

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

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-2026-84962?

libmongocrypt: upgrade to 1.20.2. Exact commands for each OS are on this page.

Is CVE-2026-84962 being exploited?

CVE-2026-84962 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-2026-84962 affect?

CVE-2026-84962 affects libmongocrypt. Severity is medium (CVSS 4.2). An unauthorized user with key vault write access may cause an authorized client to issue arbitrary authenticated Google Cloud KMS API calls under the authorized user's identity, escalating database-level access into cloud key control and de

How urgent is CVE-2026-84962?

Priority 17/100. No elevated risk signals yet.

Software pages

MongoDB vulnerabilities · HashiCorp Vault vulnerabilities · Google Cloud vulnerabilities

Related CVEs

CVE-2026-81523 MEDIUM 4.4 UPGRADE A missing input-validation issue in MongoDB libmongocrypt's automatic-encryption context setup allows a caller
CVE-2026-84971 MEDIUM 6.5 UPGRADE Improper handling of an unexpected value size in the decryption path of a client-side encryption library can c

References

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