SB20260424107 - Improperly Controlled Modification of Dynamically-Determined Object Attributes in devalue

Description

This security bulletin contains information about 1 vulnerability.

1) Improperly Controlled Modification of Dynamically-Determined Object Attributes (CVE-ID: CVE-2025-57820)

CWE-ID: CWE-915 - Improperly Controlled Modification of Dynamically-Determined Object Attributes

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber

The vulnerability allows a remote attacker to modify application behavior.

The vulnerability exists due to improper control of dynamically managed code resources in devalue.parse when parsing a crafted serialized payload. A remote attacker can supply input containing a __proto__ property to modify application behavior.

Remediation

Install update from vendor's website.

References

• https://github.com/sveltejs/devalue/security/advisories/GHSA-vj54-72f3-p5jv
• https://github.com/advisories/GHSA-vj54-72f3-p5jv