CVE-2026-22775: devalue vulnerable to denial of service due to memory/CPU exhaustion in devalue.parse

Vulnerability summary

CVE-2026-22775 is a high (CVSS 7.5) vulnerability in svelte devalue. EPSS estimates a 0.63% chance of exploitation in the next 30 days, higher than 50% of scored vulnerabilities.

Timeline

1. 15-01-2026
   PublishedVulnerability first disclosed.
2. 15-07-2026
   Last modifiedVulnerability information updated.

Description

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.

• CWE-405Asymmetric Resource Consumption (Amplification)The product does not properly control situations in which an adversary can cause the product to consume or produce excessive resources without requiring the adversary to invest equivalent work or otherwise prove authorization, i.e., the adversary's influence is "asymmetric."