Heap out-of-bounds read via corrupt nested BSON in field path error message (CVE-2026-84968) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-84968

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

Answer in brief

CVE-2026-84968 records a Unknown severity vulnerability in Heap out-of-bounds read via corrupt nested BSON in field path error message. The current sources do not mark it as known exploited. The current feed maps MongoDB/PHP Driver (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 3, 2026Updated Sep 3, 2026Source checked Sep 3, 2026First seen by HOL Sep 3, 2026Material review Sep 3, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps MongoDB/PHP Driver (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
MongoDB/PHP Drivergeneric	>=1.15.0 <1.21.8 \|\| >=2.0.0 <2.5.1	1.21.8, 2.5.1

Recommended response

Check inventory. Check lockfiles and deployed manifests for MongoDB/PHP Driver.
Review the reported fix. Update MongoDB/PHP Driver to 1.21.8 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 3, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 3, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 3, 2026

Sources and claim methodology

Source referencejira.mongodb.org

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.