High · CVSS 6.5CVE-2026-82052

$regexFindAll may crash mongod server when byte-matching multi-byte UTF-8 charsCVE-2026-82052

Answer in brief

CVE-2026-82052 records a High severity (CVSS 6.5) vulnerability in $regexFindAll may crash mongod server when byte-matching multi-byte UTF-8 chars. The current sources do not mark it as known exploited. The current feed maps MongoDB/MongoDB Server (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 8, 2026Updated Sep 16, 2026Source checked Oct 25, 2026First seen by HOL Sep 8, 2026Material review Sep 16, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 6.5
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 6.5. 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/MongoDB Server (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:a:mongodb:mongodb::::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
MongoDB/MongoDB Servergeneric	>=8.3.0 <8.3.9 \|\| >=8.0 <8.0.30 \|\| >=7.0 <7.0.41	8.3.9, 8.0.30, 7.0.41

Recommended response

Check inventory. Check lockfiles and deployed manifests for MongoDB/MongoDB Server.
Review the reported fix. Update MongoDB/MongoDB Server to 8.3.9 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 8, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 8, 2026

Sources and claim methodology

Upstream source description

The $regexFindAll expression can be used by an authenticated user who can run aggregation pipeline stages to crash a MongoDB server (mongod). Under certain specific conditions the regex match can start in the middle of a multi-code-unit character, triggering an assertion during query execution.

Quoted source text, attributed separately from HOL analysis.