CVE-2026-22775
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.
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 5.1.0 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.
- 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/11755849fa0634ae294a15ec0aef2f43efcad7c4Patch
- https://github.com/sveltejs/devalue/releases/tag/v5.6.2Release Notes
- https://github.com/sveltejs/devalue/security/advisories/GHSA-g2pg-6438-jwpfVendor Advisory
- https://access.redhat.com/errata/RHSA-2026:2144
- https://access.redhat.com/errata/RHSA-2026:2926
- https://access.redhat.com/security/cve/CVE-2026-22775
- https://bugzilla.redhat.com/show_bug.cgi?id=2430109
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-22775.json
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.