CVE-2026-81526: The MongoDB Rust Driver does not neutralize special characters in a caller-supplied target identifier before e

Routine

MEDIUM 6.5UPGRADE

CVE-2026-81526 is a medium-severity flaw (CVSS 6.5) affecting rust driver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The MongoDB Rust Driver does not neutralize special characters in a caller-supplied target identifier before embedding it in the request it sends to the server. An actor able to influence that identifier in an application using the driver may cause write operations to be applied to an unintended target within the same deployment using the application's own credentials. This may result in unauthorized modification of data belonging to another logi

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 66%)
CISA exploited list	No
Weakness	CWE-74
Published	2026-08-27
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

2026-08-27 20:18 UTCPublished CVE record published
2026-09-29 19:16 UTCUpdated Record last modified

mongodb rust driver UPGRADE

Affected: >= 3.0.0 and < 3.8.2

Fixed in: 3.8.2

Safe to downgrade to: a release before 3.0.0

1. Check installed version

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

2. UPGRADE to 3.8.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade rust-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 3.0.0 (Debian / Ubuntu)

apt-cache madison rust-driver sudo apt install rust-driver=<VERSION_BEFORE_3.0.0> sudo apt-mark hold rust-driver

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

dnf --showduplicates list rust-driver sudo dnf downgrade rust-driver-<VERSION_BEFORE_3.0.0> sudo dnf versionlock add rust-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-2026-81526?

rust driver: upgrade to 3.8.2. Exact commands for each OS are on this page.

Is CVE-2026-81526 being exploited?

CVE-2026-81526 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-2026-81526 affect?

CVE-2026-81526 affects rust driver. Severity is medium (CVSS 6.5). The MongoDB Rust Driver does not neutralize special characters in a caller-supplied target identifier before embedding it in the request it sends to the server. An actor able to influence that identifier in an application using the driver m

How urgent is CVE-2026-81526?

Priority 31/100. No elevated risk signals yet.

Software pages

MongoDB vulnerabilities

Related CVEs

CVE-2026-88024 HIGH 8.3 UPGRADE Improper neutralization of special elements in data query logic in the GridFS component of the MongoDB Rust Dr

References

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