Bug 1921304 (CVE-2021-26271)

Summary: CVE-2021-26271 ckeditor: Regular expression denial of service via crafted text into the Styles input
Product: [Other] Security Response Reporter: Pedro Sampaio <psampaio>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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Fixed In Version: ckeditor 4.16 Doc Type: If docs needed, set a value
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Last Closed: 2021-10-28 05:29:02 UTC Type: ---
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Description Pedro Sampaio 2021-01-27 20:59:47 UTC
It was possible to execute a ReDoS-type attack inside CKEditor 4 before 4.16 by persuading a victim to paste crafted text into the Styles input of specific dialogs (in the Advanced Tab for Dialogs plugin).

https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-416