CVE-2026-84968Network attack vectorHinoki check available

Memory disclosure via nested BSON field-path overread

Published Sep 3, 2026 · Updated Sep 3, 2026

Out-of-bounds read in affected MongoDB PHP Driver releases allows remote attackers to disclose adjacent memory via crafted BSON. During BSON decoding, corrupt nested data makes field-path error construction read past a heap buffer and copy a small amount of adjacent memory into an exception message returned to application code. Disclosure reaches an attacker only when an application accepts the crafted BSON and exposes the resulting error message.

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

Out-of-bounds read in affected MongoDB PHP Driver releases allows remote attackers to disclose adjacent memory via crafted BSON. During BSON decoding, corrupt nested data makes field-path error construction read past a heap buffer and copy a small amount of adjacent memory into an exception message returned to application code. Disclosure reaches an attacker only when an application accepts the crafted BSON and exposes the resulting error message.

The record

CVE
CVE-2026-84968
Published
Sep 3, 2026
Updated
Sep 3, 2026
Vendor
MongoDB
Product
MongoDB PHP Driver
Classifications
CWE-125
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 3, 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=1.15.0 <1.21.8
  2. Affected versionversion=2.0.0 <2.5.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MongoDB · MongoDB PHP Driverversion=1.15.0 <1.21.8; version=2.0.0 <2.5.1

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read

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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