GHSA-3JC6-6R48-V6QF

Vulnerability from github – Published: 2026-04-20 03:34 – Updated: 2026-04-23 14:23
VLAI?
Summary
Deep Merge is Vulnerable to Prototype Pollution Through Lack of Sanitization
Details

A Prototype Pollution vulnerability was determined in brikcss merge up to 1.3.0. Executing a manipulation of the argument proto/constructor.prototype/prototype can lead to improperly controlled modification of object prototype attributes. The attack may be performed from remote. The vendor was contacted early about this disclosure but did not respond in any way.

Severity ?
7.3 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@brikcss/merge"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "1.3.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-6594"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1321",
      "CWE-94"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-23T14:23:26Z",
    "nvd_published_at": "2026-04-20T02:16:15Z",
    "severity": "MODERATE"
  },
  "details": "A Prototype Pollution vulnerability was determined in brikcss merge up to 1.3.0. Executing a manipulation of the argument __proto__/constructor.prototype/prototype can lead to improperly controlled modification of object prototype attributes. The attack may be performed from remote. The vendor was contacted early about this disclosure but did not respond in any way.",
  "id": "GHSA-3jc6-6r48-v6qf",
  "modified": "2026-04-23T14:23:26Z",
  "published": "2026-04-20T03:34:41Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6594"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/brikcss/merge"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sudo-secure/security-research/blob/main/brikcss-merge/prototype-pollution/PoC.md"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/submit/791805"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/vuln/358229"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/vuln/358229/cti"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Deep Merge is Vulnerable to Prototype Pollution Through Lack of Sanitization"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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