CVE-2026-88023: Improper neutralization of special elements in data query logic in the GridFS component of the MongoDB PHP Lib

Routine

HIGH 8.3UPGRADE

CVE-2026-88023 is a high-severity flaw (CVSS 8.3) affecting php library. 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 PHP Library 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	0.3% (top 74%)
CISA exploited list	No
Weakness	CWE-943
Published	2026-09-10
Last modified	2026-09-29

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

Last updated 2026-09-29 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-10 18:18 UTCPublished CVE record published
2026-09-29 16:37 UTCUpdated Record last modified

mongodb php library UPGRADE

Affected: >= 1.1.0 and < 1.21.5 · >= 2.0.0 and < 2.4.2

Fixed in: 1.21.5, 2.4.2

Safe to downgrade to: a release before 1.1.0

1. Check installed version

apt-cache policy php-library || rpm -q php-library || php-library --version

2. UPGRADE to 1.21.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade php-library

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade php-library

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 1.1.0 (Debian / Ubuntu)

apt-cache madison php-library sudo apt install php-library=<VERSION_BEFORE_1.1.0> sudo apt-mark hold php-library

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

dnf --showduplicates list php-library sudo dnf downgrade php-library-<VERSION_BEFORE_1.1.0> sudo dnf versionlock add php-library

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-2026-88023?

php library: upgrade to 1.21.5, 2.4.2. Exact commands for each OS are on this page.

Is CVE-2026-88023 being exploited?

CVE-2026-88023 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-2026-88023 affect?

CVE-2026-88023 affects php library. Severity is high (CVSS 8.3). Improper neutralization of special elements in data query logic in the GridFS component of the MongoDB PHP Library can cause a caller-supplied structured file identifier to be interpreted as a query condition rather than as a literal identi

How urgent is CVE-2026-88023?

Priority 35/100. High severity

Software pages

PHP vulnerabilities · MongoDB vulnerabilities

References

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