Bug 2535592 (CVE-2026-81176)

Summary: CVE-2026-81176 devalue: Devalue: Denial of Service via malformed input parsing
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: cdrage, eborisov, lball, ngough, rushinde, veshanka
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Svelte devalue library. An attacker can provide a specially crafted, untrusted payload to the `devalue.parse` function. This malformed input, specifically out-of-bounds indices, can cause the parser to perform quadratic work, leading to a denial of service (DoS) in applications that process such data.
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Description OSIDB Bzimport 2026-09-16 18:41:46 UTC 
Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. Prior to 5.9.2, devalue.parse does not reject out-of-bounds indices that are greater than or equal to values.length in src/parse.js. A specially crafted untrusted payload can make the parser alternate between array representations, producing quadratic work as the payload grows and causing denial of service in applications that parse untrusted devalue data. This issue is fixed in version 5.9.2.