Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') Affecting langfuse-4 package, versions <4.32.0-r4


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.33% (26th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-LANGFUSE4-19829147
  • published16 Sept 2026
  • disclosed3 Sept 2026

Introduced: 3 Sep 2026

NewCVE-2026-85063  (opens in a new tab)
CWE-1321  (opens in a new tab)

How to fix?

Upgrade Chainguard langfuse-4 to version 4.32.0-r4 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream langfuse-4 package and not the langfuse-4 package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

node-csv is a full-featured CSV parser with a simple API that is tested against large datasets. Prior to 7.0.2, csv-parse with the columns and group_columns_by_name options enabled treats a duplicate proto header as an existing property in packages/csv-parse/lib/api/index.js, assigns an attacker-controlled array through obj['proto'], and replaces the parsed record object's prototype. A malicious CSV header can therefore inject inherited array values into the returned record, hide those inherited values from JSON serialization, and affect property enumeration and type or shape checks in applications that process the record. This issue is fixed in version 7.0.2.

CVSS Base Scores

version 3.1