PT-2025-34819 · Unknown · Svelte Devalue

Apyatko · Published 2025-08-26 · Updated 2025-08-27 · CVE-2025-57820

Positive Technologies (AI Summary)

CVSS v4.0

7.9

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H

Name of the Vulnerable Software and Affected Versions: Svelte devalue versions prior to 5.3.2

Description: Svelte devalue is a utility library susceptible to prototype pollution. Passing a string to devalue.parse that represents an object with a proto property, without numeric index checking, can lead to prototype assignment to objects and properties.

Recommendations: Update to version 5.3.2 or later.

Exploit

Fix

Prototype Pollution

Weakness Enumeration

CWE-1321

Related Identifiers

CVE-2025-57820

GHSA-VJ54-72F3-P5JV

Affected Products

Svelte Devalue

References · 9

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/57xxx/CVE-2025-57820.json · Exploit
• https://osv.dev/vulnerability/CVE-2025-57820 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-vj54-72f3-p5jv · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-57820 · Security Note
• https://github.com/sveltejs/devalue · Note
• https://github.com/sveltejs/devalue/commit/0623a47c9555b639c03ff1baea82951b2d9d1132 · Note
• https://github.com/sveltejs/devalue/security/advisories/GHSA-vj54-72f3-p5jv · Note
• https://twitter.com/CVEnew/status/1960474958275952696 · Twitter Post
• https://t.me/CVEtracker/30991 · Telegram Post