Heap buffer overflow via mid-scan command list growth in client topology monitoring (CVE-2026-96746) | HOL Guard CVE

High · CVSS 8.3CVE-2026-96746

Heap buffer overflow via mid-scan command list growth in client topology monitoring

Answer in brief

CVE-2026-96746 records a High severity (CVSS 8.3) vulnerability in Heap buffer overflow via mid-scan command list growth in client topology monitoring. The current sources do not mark it as known exploited. The current feed maps MongoDB/C 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 24, 2026Updated Sep 24, 2026Source checked Sep 25, 2026First seen by HOL Sep 25, 2026Material review Sep 24, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.3
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 8.3. 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/C Driver (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
MongoDB/C Drivergeneric	>=0 <1.30.12 \|\| >=2.0.0 <2.5.5	1.30.12, 2.5.5

Recommended response

Check inventory. Check lockfiles and deployed manifests for MongoDB/C Driver.
Review the reported fix. Update MongoDB/C Driver to 1.30.12 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 25, 2026

Sources and claim methodology

Upstream source description

An out-of-bounds write in the connection-monitoring logic of the MongoDB C Driver may allow an unauthenticated party who controls name resolution and the responses of the hosts named in a client's connection string to write beyond the end of a heap buffer. This may cause the application using the driver to terminate unexpectedly.

Quoted source text, attributed separately from HOL analysis.