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CVE-2026-54737— @phun-ky/defaults-deep Has a Prototype Pollution issue via Unsafe Recursive Property Merging

Quick assessment

Affected
phun-ky defaults-deep
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

defaults-deep project defaults-deep是defaults-deep project团队开源的一个递归复制对象属性的软件包。 defaults-deep project defaults-deep 2.0.5之前版本存在输入验证错误漏洞，该漏洞源于defaultsDeep()函数在递归合并用户提供的对象时未过滤proto、constructor和prototype属性，容易受到原型污染攻击。

CVSS 7.3 · High EPSS 0.26% · P18

Possible ATT&CK Techniques 1 AI

T1556 · Modify Authentication Process

Affected Version Matrix 1

VendorProduct Version RangeStatus
phun-ky defaults-deep < 2.0.5 affected
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I. Basic Information for CVE-2026-54737

Vulnerability Information
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Vulnerability Title
@phun-ky/defaults-deep Has a Prototype Pollution issue via Unsafe Recursive Property Merging
Source: CVE Program / CVE List V5
Vulnerability Description
@phun-ky/defaults-deep is a library like lodash defaultsDeep with array preservation and no lodash dependency. Prior to 2.0.5, defaultsDeep() recursively merges user-supplied objects without filtering proto, constructor, and prototype, allowing properties to be written to Object.prototype. This issue is fixed in version 2.0.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Vulnerability Title
defaults-deep project defaults-deep 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
defaults-deep project defaults-deep是defaults-deep project团队开源的一个递归复制对象属性的软件包。 defaults-deep project defaults-deep 2.0.5之前版本存在输入验证错误漏洞，该漏洞源于defaultsDeep()函数在递归合并用户提供的对象时未过滤proto、constructor和prototype属性，容易受到原型污染攻击。
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

Vendor Product Affected Versions CPE Subscribe
phun-ky defaults-deep < 2.0.5 -

II. Public POCs for CVE-2026-54737

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 5694 chars
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III. Intelligence Information for CVE-2026-54737

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Patches & Fixes for CVE-2026-54737 (3)

Vendor Advisories for CVE-2026-54737 (1)

IV. Related Vulnerabilities

Same product: defaults-deep
Same weakness: CWE-1321

V. Comments for CVE-2026-54737

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