Bug 2528257 (CVE-2026-85063)

Summary:	CVE-2026-85063 csv-parse: node-csv: Prototype pollution via malicious CSV header
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	abarbaro, alizardo, dfreiber, drow, dschmidt, gmalinko, janstey, jburrell, jchui, jhe, jlanda, kshier, ktsao, nboldt, oaljalju, pdelbell, psrna, rbobbitt, rstepani, simaishi, stcannon, teagle, vkumar, yguenane
Target Milestone:	---	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in node-csv, specifically within its csv-parse component. When configured with columns and group_columns_by_name options, a remote attacker can craft a malicious CSV header to manipulate the __proto__ property. This allows the injection of attacker-controlled values into the parsed record's prototype, leading to information disclosure. This vulnerability can also affect property enumeration and type or shape checks in applications processing the record.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-09-03 20:41:53 UTC

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.