CVE-2026-81526Hinoki check available

Cross-database writes via unvalidated dotted database names

Published Aug 27, 2026 · Updated Aug 27, 2026

Improper input validation in MongoDB Rust Driver 3.0.0 through 3.8.1 allows attackers to redirect bulk writes across databases. The driver embeds a caller-supplied target identifier containing a dotted database name into the bulkWrite namespace request without neutralizing the special characters, causing the server to apply the write to an unintended target. Exploitation requires an application to pass attacker-influenced identifiers through its own database credentials; resulting writes can modify data across an application-enforced logical boundary.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Improper input validation in MongoDB Rust Driver 3.0.0 through 3.8.1 allows attackers to redirect bulk writes across databases. The driver embeds a caller-supplied target identifier containing a dotted database name into the bulkWrite namespace request without neutralizing the special characters, causing the server to apply the write to an unintended target. Exploitation requires an application to pass attacker-influenced identifiers through its own database credentials; resulting writes can modify data across an application-enforced logical boundary.

The record

CVE
CVE-2026-81526
Published
Aug 27, 2026
Updated
Aug 27, 2026
Vendor
MongoDB
Product
MongoDB Rust Driver
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.0.0 <3.8.2

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

MongoDB · MongoDB Rust Driverversion=3.0.0 <3.8.2

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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