Bug 2439272 (CVE-2026-2327)

Summary: CVE-2026-2327 markdown-it: markdown-it: Denial of Service via Regular Expression Denial of Service in linkify function
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: abarbaro, alizardo, dschmidt, erezende, jcantril, jchui, jhe, jlanda, kshier, ktsao, mattdavi, nboldt, psrna, rojacob, sdawley, simaishi, smcdonal, stcannon, teagle, yguenane
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in markdown-it. A remote attacker can exploit this Regular Expression Denial of Service (ReDoS) vulnerability by providing a specially crafted input containing a long sequence of asterisk characters followed by a non-matching character to the `linkify` function. This triggers excessive backtracking in the regular expression, leading to a denial-of-service condition.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2439338, 2439339, 2439340, 2439341, 2439342    
Bug Blocks:    

Description OSIDB Bzimport 2026-02-12 06:01:22 UTC 
Versions of the package markdown-it from 13.0.0 and before 14.1.1 are vulnerable to Regular Expression Denial of Service (ReDoS) due to the use of the regex /\*+$/ in the linkify function. An attacker can supply a long sequence of * characters followed by a non-matching character, which triggers excessive backtracking and may lead to a denial-of-service condition.