High · CVSS 8.6CVE-2026-113870

Improper Encoding of Server-Supplied JavaScript Values in MongoDB Compass BSON ParsingCVE-2026-113870

Answer in brief

CVE-2026-113870 records a High severity (CVSS 8.6) vulnerability in Improper Encoding of Server-Supplied JavaScript Values in MongoDB Compass BSON Parsing. The current sources do not mark it as known exploited. The current feed maps MongoDB/Compass (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 Oct 21, 2026Updated Oct 21, 2026Source checked Oct 21, 2026First seen by HOL Oct 21, 2026Material review Oct 21, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.6
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 8.6. 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/Compass (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
MongoDB/Compassgeneric	>=1.7.0 <1.49.15	1.49.15

Recommended response

Check inventory. Check lockfiles and deployed manifests for MongoDB/Compass.
Review the reported fix. Update MongoDB/Compass to 1.49.15 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Oct 21, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 21, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 21, 2026

Sources and claim methodology

Source referencemongodb.com

Upstream source description

MongoDB Compass improperly escapes certain BSON values when converting a stored view’s aggregation pipeline into editable source. When a user connects to a MongoDB deployment containing a specially crafted view and opens that view for editing, the values can cause arbitrary code to execute with the privileges of the user running Compass.

Quoted source text, attributed separately from HOL analysis.