Bug 2543276 (CVE-2026-97711)

Summary: CVE-2026-97711 serialize-javascript: serialize-javascript: Cross-Site Scripting via unescaped script-closing tags in serialized functions
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in serialize-javascript. This vulnerability allows a remote attacker to conduct Cross-Site Scripting (XSS) attacks by supplying crafted function code containing unescaped script-closing tags. When the serialized function is embedded within an HTML script element, the unescaped tag prematurely terminates the script block, causing the browser to execute subsequent content as HTML in the page's context.
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Description OSIDB Bzimport 2026-09-29 16:16:27 UTC 
Serialize JavaScript serializes JavaScript values to a superset of JSON that includes regular expressions and functions. From 7.1.1 until 7.1.2, function values serialized by serialize-javascript are not fully protected against script-closing tags in attacker-influenced function source because SCRIPT_CLOSE_REGEXP can consume a second closing tag inside one match. When the serialized function is embedded in a script element, the surviving closing tag terminates the element early and causes the remaining output to be parsed as HTML, enabling cross-site scripting in the page origin. Only function values are affected; ordinary data values and options.isJSON output are unaffected. This issue is fixed in version 7.1.2.