Denial of Service Vulnerability in Svelte JavaScript Library
CVE-2026-22774

7.5HIGH

Key Information:

Vendor

Sveltejs

Status
Devalue
Vendor
CVE Published:
15 January 2026

What is CVE-2026-22774?

A vulnerability in the Svelte devalue JavaScript library allows an attacker to exploit devalue.parse with crafted inputs, leading to excessive CPU and memory usage. The issue arises from the method's failure to verify the type of input before processing, resulting in potential Denial of Service (DoS) on systems parsing untrusted data. This problem affects versions 5.3.0 to 5.6.1 and has been resolved in version 5.6.2. Developers are encouraged to update to the latest version to mitigate any risk.

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Affected Version(s)

devalue >= 5.3.0, < 5.6.2

References

https://github.com/sveltejs/devalue/security/advisories/G...
x_refsource_CONFIRM
https://github.com/sveltejs/devalue/commit/e46afa64dd2b25...
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

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