CVE-2026-88034: Improper neutralization of special elements in data query logic in the GridFS component of the MongoDB C++ Dri

Routine

HIGH 8.3UPGRADE

CVE-2026-88034 is a high-severity flaw (CVSS 8.3) affecting c\+\+ driver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper neutralization of special elements in data query logic in the GridFS component of the MongoDB C++ Driver can cause a caller-supplied structured file identifier to be interpreted as a query condition rather than as a literal identifier. An authenticated user who can influence the identifier passed by an affected application may obtain stored file content beyond the intended target or cause all GridFS file chunks in the affected bucket to

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.3 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 61%)
CISA exploited list	No
Weakness	CWE-943
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 18:00 UTCUpdated Record last modified

mongodb c\+\+ driver UPGRADE

Affected: >= 3.2.0 and < 4.5.2

Fixed in: 4.5.2

Safe to downgrade to: a release before 3.2.0

1. Check installed version

apt-cache policy c++-driver || rpm -q c++-driver || c++-driver --version

2. UPGRADE to 4.5.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade c++-driver

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade c++-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 3.2.0 (Debian / Ubuntu)

apt-cache madison c++-driver sudo apt install c++-driver=<VERSION_BEFORE_3.2.0> sudo apt-mark hold c++-driver

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

dnf --showduplicates list c++-driver sudo dnf downgrade c++-driver-<VERSION_BEFORE_3.2.0> sudo dnf versionlock add c++-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-2026-88034?

c\+\+ driver: upgrade to 4.5.2. Exact commands for each OS are on this page.

Is CVE-2026-88034 being exploited?

CVE-2026-88034 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-2026-88034 affect?

CVE-2026-88034 affects c\+\+ driver. Severity is high (CVSS 8.3). Improper neutralization of special elements in data query logic in the GridFS component of the MongoDB C++ Driver can cause a caller-supplied structured file identifier to be interpreted as a query condition rather than as a literal identif

How urgent is CVE-2026-88034?

Priority 39/100. High severity

Software pages

MongoDB vulnerabilities

Related CVEs

CVE-2026-81522 HIGH 8.1 UPGRADE A weakness in the MongoDB C++ Driver's handling of caller-supplied namespace identifiers allows special charac
CVE-2026-84966 MEDIUM 5.1 UPGRADE An incorrect numeric type conversion in the BSON document building component of the MongoDB C++ Driver may cau
CVE-2026-84970 MEDIUM 6.2 UPGRADE A numeric truncation weakness exists in the JSON parsing component of the MongoDB C++ Driver's BSON library

References

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