What’s Vulnerable › Vulnerabilities

CVE-2026-113650: ApostropheCMS sanitize-html: unbounded recursion when re-sanitizing the fallback of a discarded iframe (stack overflow, nestingLimit not enforced)

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-20 · updated 2026-10-28
• Weakness: CWE-674

Description

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.

Affected products

• apostrophecms apostrophe: before 4.34.0
• apostrophecms sanitize-html: from 2.18.0, < 2.18.1

References

• https://github.com/apostrophecms/apostrophe/commit/06e4b377f3c360f9e89c32dccd7e505ad5ddf498
• https://github.com/apostrophecms/apostrophe/commit/40b989b1a9dd23d30029b8ce7668634265cfe5ea
• https://github.com/apostrophecms/apostrophe/releases/tag/sanitize-html@2.18.1
• https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-c9rx-x947-fp3h
• https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-c9rx-x947-fp3h

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