RCE in Brikcss Merge
CVE-2026-6594
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 prototyp…
Vulnerability class: Prototype Pollution
EPSS: 0.001 (20.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:X/RC:R.
Affected products
- Brikcss Merge — versions 1.0, 1.1, 1.2
Weakness classification (CWE)
References
- VDB-358229 | brikcss merge prototype pollution (vdb-entry, technical-description)
- VDB-358229 | CTI Indicators (IOB, IOC, TTP, IOA) (signature, permissions-required)
- Submit #791805 | brikcss @brikcss/merge 1.3.0 Prototype Pollution (third-party-advisory)
- github.com/sudo-secure/security-research/blob/main/brikcss-merge/prototype-poll… (exploit)
Frequently asked questions
- What is CVE-2026-6594?
- CVE-2026-6594 is a high-severity vulnerability in Brikcss Merge, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 7.3/10. Published 2026-04-20.
- How severe is CVE-2026-6594?
- High severity. CVSS v3 base score is 7.3 out of 10.