Bug 2545261 (CVE-2026-104845)

Summary: CVE-2026-104845 seroval: seroval: Denial of Service via unbounded memory allocation during deserialization
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: blitton, mbarnett
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in seroval. A remote attacker can cause a Denial of Service (DoS) by providing crafted JSON input containing an excessively large array length during data deserialization. Due to missing bounds validation when reconstructing array structures, the application synchronously allocates excessive memory and processor resources, blocking the event loop and making the service unresponsive.
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Description OSIDB Bzimport 2026-10-02 16:15:56 UTC 
Seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. Prior to 1.6.3, deserializeTypedArray in fromJSON and fromCrossJSON trusts a deserialized source value as an ArrayBuffer and does not bound the serialized element count. An attacker can provide a small untrusted JSON object with a large length value, causing the array-like TypedArray constructor to synchronously allocate the selected number of elements and exhaust CPU or memory while starving the event loop. The offset check does not reject the crafted source because source.byteLength is undefined. DataView reaches a similar unchecked cast but throws rather than allocating, and the issue has no identified confidentiality or integrity impact. This issue is fixed in version 1.6.3.