Threat Intelligence Database

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 deserializing sparse arrays, leading to excessive memory consumption. This issue has been patched in version 5.8.1.

The devalue library versions 4.0.0 up to but not including 5.6.4 have a behavior where the functions devalue.parse and devalue.unflatten can produce objects containing own properties named __proto__. While this behavior alone is not a security vulnerability, it can lead to prototype pollution if downstream code improperly handles these objects, such as by using Object.assign. This can result in the target object's prototype being modified unintentionally. No known exploits are reported in the wild, and the severity is considered low.

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 lead to Denial of Service (DoS) or type confusion. This vulnerability is fixed in 5.6.4.

MediumVulnerabilityUnited StatesGermanyUnited Kingdom+7#cve#cve-2026-30226#cwe-1321

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 input from untrusted sources. This affects applications using devalue.parse on externally-supplied data. The root cause is the ArrayBuffer hydration expecting base64 encoded strings as input, but not checking the assumption before decoding the input. This vulnerability is fixed in 5.6.2.

HighVulnerabilityGermanyFranceNetherlands+3#cve#cve-2026-22775#cwe-405

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 input from untrusted sources. This affects applications using devalue.parse on externally-supplied data. The root cause is the typed array hydration expecting an ArrayBuffer as input, but not checking the assumption before creating the typed array. This vulnerability is fixed in 5.6.2.

HighVulnerabilityGermanyFranceNetherlands+4#cve#cve-2026-22774#cwe-405