Vulnerability in Svelte Devalue
CVE-2026-22775
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (49.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: -0.000
Affected products
- Svelte Devalue
- Sveltejs Devalue — versions >= 5.1.0, < 5.6.2
Weakness classification (CWE)
References
- github.com/sveltejs/devalue/security/advisories/GHSA-g2pg-6438-jwpf (Vendor Advisory)
- github.com/sveltejs/devalue/commit/11755849fa0634ae294a15ec0aef2f43efcad7c4 (Patch)
- github.com/sveltejs/devalue/releases/tag/v5.6.2 (Release Notes)
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-22775?
- CVE-2026-22775 is a high-severity vulnerability in Svelte Devalue, classified under Asymmetric Resource Consumption (Amplification). CVSS score: 7.5/10. Published 2026-01-15.
- How severe is CVE-2026-22775?
- High severity. CVSS v3 base score is 7.5 out of 10.