Bug 2453162 (CVE-2026-21717)

Summary:	CVE-2026-21717 nodejs: v8: Node.js: Denial of Service via V8 string hashing mechanism due to predictable hash collisions
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:	caswilli, kaycoth
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in V8's string hashing mechanism within Node.js. A remote attacker can exploit this vulnerability by crafting requests containing integer-like strings. These specially crafted strings cause predictable hash collisions in V8's internal string table, particularly when processed by functions like JSON.parse() on attacker-controlled input. This can significantly degrade the performance of the Node.js process, leading to a Denial of Service (DoS) condition.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2453563, 2453564, 2453565
Bug Blocks:

Description OSIDB Bzimport 2026-03-30 20:02:34 UTC

A flaw in V8's string hashing mechanism causes integer-like strings to be hashed to their numeric value, making hash collisions trivially predictable. By crafting a request that causes many such collisions in V8's internal string table, an attacker can significantly degrade performance of the Node.js process.

The most common trigger is any endpoint that calls `JSON.parse()` on attacker-controlled input, as JSON parsing automatically internalizes short strings into the affected hash table.

This vulnerability affects **20.x, 22.x, 24.x, and 25.x**.

Comment 2 errata-xmlrpc 2026-04-09 20:20:34 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:7350 https://access.redhat.com/errata/RHSA-2026:7350

Comment 3 errata-xmlrpc 2026-04-13 02:23:24 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:7675 https://access.redhat.com/errata/RHSA-2026:7675

Comment 4 errata-xmlrpc 2026-04-13 02:47:53 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:7670 https://access.redhat.com/errata/RHSA-2026:7670