Bug 2431917 (CVE-2026-23956)

Summary: CVE-2026-23956 seroval: Seroval: Denial of Service via malicious regular expressions during deserialization
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Version: unspecifiedKeywords: Security
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A flaw was found in seroval, a JavaScript (JS) value stringification library. A remote attacker could exploit this vulnerability by providing specially crafted regular expressions during deserialization. This could lead to the exhaustion of JavaScript runtime memory or trigger a Regular Expression Denial of Service (ReDoS), making the application unavailable to legitimate users.
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Bug Depends On: 2431946, 2431950, 2431956    
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Description OSIDB Bzimport 2026-01-22 02:01:59 UTC 
seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. In versions 1.4.0
and below, overriding RegExp serialization with extremely large patterns can exhaust JavaScript runtime memory during deserialization. Additionally, overriding RegExp serialization with patterns that trigger catastrophic backtracking can lead to ReDoS (Regular Expression Denial of Service). This issue has been fixed in version 1.4.1.