CVE-2025-57820— Svelte devalue vulnerable to prototype pollution
Quick assessment
Affected
sveltejs devalue
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Svelte是Svelte开源的一种构建 Web 应用程序的新方法。 Svelte 5.3.2之前版本存在安全漏洞，该漏洞源于未正确检查输入对象属性，可能导致原型污染。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-57820
Vulnerability Information
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Vulnerability Title
Svelte devalue vulnerable to prototype pollution
Source: CVE Program / CVE List V5
Vulnerability Description
Svelte devalue is a utility library. Prior to version 5.3.2, a string passed to devalue.parse could represent an object with a __proto__ property and devalue.parse does not check that an index is numeric. This could result in assigning prototypes to objects and properties, leading to prototype pollution. This issue has been fixed in version 5.3.2
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Vulnerability Title
Svelte 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Svelte是Svelte开源的一种构建 Web 应用程序的新方法。 Svelte 5.3.2之前版本存在安全漏洞，该漏洞源于未正确检查输入对象属性，可能导致原型污染。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2025-57820
| # | POC Description | Source Link | Shenlong Link |
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Vendor Advisories for CVE-2025-57820 (1)
IV. Related Vulnerabilities
Same product: devalue
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CVE-2026-92708
devalue: Cross-request process memory disclosure in devalue -
CVE-2026-81176
Svelte devalue: DoS via malformed input -
CVE-2026-42570
Svelte devalue: DoS via sparse array deserialization -
CVE-2026-30226
devalue has prototype pollution in devalue.parse and devalue -
CVE-2026-22775
devalue vulnerable to denial of service due to memory/CPU ex
Same vendor: sveltejs
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CVE-2026-92708
devalue: Cross-request process memory disclosure in devalue -
CVE-2026-81176
Svelte devalue: DoS via malformed input -
CVE-2026-82260
SvelteKit before 2.52.2 Memory Exhaustion via Remote Form De -
CVE-2026-82261
SvelteKit before 2.52.2 CPU Exhaustion via Remote Form Deser -
CVE-2026-82259
SvelteKit 2.49.0 before 2.53.3 Denial of Service via form
Same weakness: CWE-1321
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CVE-2026-104183
stream-json: Prototype pollution: Assembler writes this.curr -
CVE-2026-102992
piscina: Prototype-pollution gadget in ThreadPool.options al -
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Prototype Pollution in Vaadin Charts and Component Base via -
CVE-2026-101909
Axios: Prototype Pollution Gadget in axios toFormData Option -
CVE-2026-101908
Axios: Prototype pollution gadget in fetch adapter can alter
V. Comments for CVE-2025-57820
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