CVE-2026-22774
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.64%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.64% probability · 48th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-405
- Affected
- svelte/devalue
- Source
- security-advisories@github.com
References
- https://github.com/sveltejs/devalue/commit/e46afa64dd2b25aa35fb905ba5d20cea63aabbf7Patch
- https://github.com/sveltejs/devalue/releases/tag/v5.6.2Release Notes
- https://github.com/sveltejs/devalue/security/advisories/GHSA-vw5p-8cq8-m7mvVendor Advisory
- https://access.redhat.com/errata/RHSA-2026:2144
- https://access.redhat.com/errata/RHSA-2026:2926
- https://access.redhat.com/security/cve/CVE-2026-22774
- https://bugzilla.redhat.com/show_bug.cgi?id=2430095
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-22774.json
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.