Bug 2477191 (CVE-2026-44581)

Summary:	CVE-2026-44581 next.js: Next.js: Stored Cross-Site Scripting via malformed nonce values in cached responses
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	bbrownin, chfoley, eborisov, gotiwari, jgrulich, jhorak, kaycoth, lball, mvyas, ngough, rgodfrey, rhel-process-autobot, swoodman, tpopela, veshanka, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in Next.js. This vulnerability, a type of stored cross-site scripting (XSS), allows a remote attacker to inject malicious scripts into web pages. By manipulating nonce values derived from request headers, an attacker can poison cached responses, leading to arbitrary script execution in the browsers of subsequent visitors.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2484211, 2484213, 2484223, 2484215, 2484217, 2484219, 2484221
Bug Blocks:

Description OSIDB Bzimport 2026-05-13 18:01:49 UTC

Next.js is a React framework for building full-stack web applications. From 13.4.0 to before 15.5.16 and 16.2.5, App Router applications that rely on CSP nonces can be vulnerable to stored cross-site scripting when deployed behind shared caches. In affected versions, malformed nonce values derived from request headers could be reflected into rendered HTML in an unsafe way, allowing an attacker to poison cached responses and cause script execution for later visitors. This vulnerability is fixed in 15.5.16 and 16.2.5.