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MongoDB PHP Driver EUVDEUVD-2026-70644

| CVE-2026-84968 MEDIUM
Out-of-bounds Read (CWE-125)
2026-09-03 mongodb
PHP Information Disclosure MongoDB Php Driver
6.9
CVSS 4.0 · Vendor: mongodb
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Severity by source

Vendor (mongodb) PRIMARY
6.9 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
5.3 MEDIUM

Network-reachable with no auth or interaction required; scope unchanged; only low confidentiality impact from partial memory leak into error messages.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (mongodb).

CVSS VectorVendor: mongodb

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Patch available
Sep 03, 2026 - 19:17 EUVD
Metadata Corrected
Sep 03, 2026 - 18:40 vuln.today
tag: Buffer Overflow removed
Analysis Generated
Sep 03, 2026 - 17:51 vuln.today

DescriptionCVE.org

An out-of-bounds read in the BSON decoding component of the MongoDB PHP driver may allow an unauthenticated party who supplies specially formed input to have a small amount of adjacent process memory copied into an error message that is returned to application code. This may result in unintended disclosure of limited memory contents.

AnalysisAI

Out-of-bounds read in the BSON decoding component of the MongoDB PHP Driver (all versions per CPE cpe:2.3:a:mongodb:php_driver) allows an unauthenticated remote party to cause a small quantity of adjacent process memory to be copied into an error message that is returned to application code. The disclosure is limited in scope - only a few bytes of process memory are exposed, and they surface in application-level error messages rather than being sent directly in a network response - but may inadvertently reveal stack variables, pointers, or partial secrets depending on memory layout. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation The target PHP application must accept attacker-controlled BSON input and pass it through the MongoDB PHP Driver's BSON decoding path. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N) scores 6.9 (Medium), accurately capturing that exploitation is network-accessible, requires no authentication, and has low confidentiality impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade the MongoDB PHP Driver (ext-mongodb) to the patched version once MongoDB releases it via the PHPC-2744 JIRA issue (https://jira.mongodb.org/browse/PHPC-2744); a specific fix version is not yet independently confirmed from available data. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-70644 vulnerability details – vuln.today
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