CVE-2026-84968

Heap out-of-bounds read via corrupt nested BSON in field path error message

MEDIUM

5.3

CVSS Score

Published: September 3, 2026 at 05:03 PM UTC

Updated: September 10, 2026 at 09:08 PM UTC

1 product affected across 1 vendorPHP Driver

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Severity

MEDIUM5.3

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

PHP Driver · MongoDB

95%

1.15.0 ≤ v < 1.21.81.15.0 ≤ v < 1.21.92.0.0 ≤ v < 2.1.92.2.0 ≤ v < 2.5.12.2.0 ≤ v < 2.5.21.15.0 2.0.0 2.2.0

Affected range stops below 1.21.8, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.21.9, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.1.9, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.5.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.5.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://jira.mongodb.org/browse/PHPC-2744

References (1)

Vendor Advisory

Source: cverecord

https://jira.mongodb.org/browse/PHPC-2744

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMmongodb

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: LOW
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-125

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