Svelte devalue: DoS via malformed input

Impact devalue.parse prior to version 5.9.2 fails to reject out-of-bounds indices. Specially-crafted payloads can exploit this to cause devalue to alternate between different array representations, resulting in work that is quadratic with payload size. Applications are potentially affected if the...

EUVD-2026-80943

Svelte devalue: DoS via malformed input...

CVE-2026-81176

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 c...

CVE-2026-81176

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 application...

CVE-2026-81176 Svelte devalue: DoS via malformed input

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 c...

PT-2026-93901

Name of the Vulnerable Software and Affected Versions Svelte devalue versions prior to 5.9.2 Description Svelte devalue is a JavaScript library used to serialize values into strings. The devalue.parse function in src/parse.js fails to reject out-of-bounds indices that are greater than or equal to...

CVE-2026-42570: Allocation of Resources Without Limits or Throttling

Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. From version 5.6.3 to before version 5.8.1, devalue.parse could, due to quirks in some JavaScript engines, be convinced to allocate much more memory than was needed when...

CVE-2026-30226: Improperly Controlled Modification of Object Prototype Attributes

Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. In devalue v5.6.3 and earlier, devalue.parse and devalue.unflatten were susceptible to prototype pollution via maliciously crafted payloads. Successful exploitation could...

CVE-2026-22774: Asymmetric Resource Consumption (Amplification)

Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. From 5.3.0 to 5.6.1, certain inputs can cause devalue.parse to consume excessive CPU time and/or memory, potentially leading to denial of service in systems that parse inpu...

CVE-2026-22775: Asymmetric Resource Consumption (Amplification)

Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. From 5.1.0 to 5.6.1, certain inputs can cause devalue.parse to consume excessive CPU time and/or memory, potentially leading to denial of service in systems that parse inpu...

CVE-2025-57820: Improperly Controlled Modification of Object Prototype Attributes

Svelte devalue is a utility library. Prior to version 5.3.2, a string passed to devalue.parse could represent an object with a proto property and devalue.parse does not check that an index is numeric. This could result in assigning prototypes to objects and properties, leading to prototype...