Bug 2556329 (CVE-2026-113650)

Summary: CVE-2026-113650 sanitize-html: sanitize-html: Denial of Service via unbounded recursion in iframe tag processing
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in sanitize-html. A remote attacker can cause a Denial of Service (DoS) by submitting specially crafted HTML input containing disallowed iframe elements. Under default configurations, the library re-sanitizes iframe content through unbounded recursive calls, exhausting system resources and causing the application to crash.
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Description OSIDB Bzimport 2026-10-20 16:43:18 UTC 
ApostropheCMS is an open-source Node.js content management system. In sanitize-html 2.18.0, when an <iframe> is not allowed and disallowedTagsMode is 'discard' (the defaults), its raw-text content is re-sanitized by a recursive call to sanitizeHtml(text, options). The recursion has no bound and starts each nested call with a fresh state. This vulnerability is fixed in 2.18.1.