CVE-2026-6594 Details
Description
A vulnerability was determined in brikcss merge up to 1.3.0. This affects an unknown part. 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.
A prototype pollution vulnerability has been identified in the Brikcss Merge package, affecting versions through 1.3.0. This vulnerability allows remote attackers to manipulate object prototype attributes by exploiting the merge function, which improperly sanitizes special keys such as '__proto__', 'constructor.prototype', and 'prototype'. As a result, attackers can inject arbitrary properties into JavaScript's global object prototype, potentially leading to various security issues, including privilege escalation, denial of service, and unexpected application behavior.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Apr 20, 2026CISA-ADP
Assessed Apr 20, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/sudo-secure/security-research/blob/main/brikcss-merge/prototype-pollution/PoC.md | [email protected] | ExploitTechnical Description |
| https://vuldb.com/submit/791805 | [email protected] | Technical Description |
| https://vuldb.com/vuln/358229 | [email protected] | AdvisoryPartial Content |
| https://vuldb.com/vuln/358229/cti | [email protected] | Content Wall |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-1321 | Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') | [email protected] |
| CWE-94 | Improper Control of Generation of Code ('Code Injection') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| brikcss merge | All versions |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 20, 2026 | New CVE Received | [email protected] |