Denial of Service Vulnerability in Svelte devalue JavaScript Library
CVE-2026-22775

7.5HIGH

Key Information:

Vendor

Sveltejs

Status
Devalue
Vendor
CVE Published:
15 January 2026

What is CVE-2026-22775?

A vulnerability in the Svelte devalue JavaScript library allows for excessive CPU and memory consumption when untrusted inputs are processed. This issue arises from the ArrayBuffer hydration mechanism, which assumes base64 encoded input without validating its format. As a result, applications utilizing devalue.parse with externally-supplied data may experience significant performance degradation or complete service disruption. The issue has been resolved in version 5.6.2, enhancing application security for those who upgrade.

Affected Version(s)

devalue >= 5.1.0, < 5.6.2

References

https://github.com/sveltejs/devalue/security/advisories/G...
x_refsource_CONFIRM
https://github.com/sveltejs/devalue/commit/11755849fa0634...
x_refsource_MISC
https://github.com/sveltejs/devalue/releases/tag/v5.6.2
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.