high7.3
CVE-2026-6594
Deep Merge is Vulnerable to Prototype Pollution Through Lack of Sanitization
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | @brikcss/merge | <= 1.3.1 | none recorded |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-3jc6-6r48-v6qf
- https://nvd.nist.gov/vuln/detail/CVE-2026-6594
- https://github.com/sudo-secure/security-research/blob/main/brikcss-merge/prototype-pollution/PoC.md
- https://vuldb.com/submit/791805
- https://vuldb.com/vuln/358229
- https://vuldb.com/vuln/358229/cti