dependency: update flatted to 3.4.2 (#33501)

Author: mschile

.circleci/cache-version.txt

@@ -1,2 +1,2 @@
 # Bump this version to force CI to re-create the cache from scratch.
-03-10-2026
+03-20-2026

cli/CHANGELOG.md

@@ -21,6 +21,7 @@ _Released 03/24/2026 (PENDING)_
 - Upgraded `simple-git` from `3.27.0` to `3.32.3` to address [Improper Handling of Case Sensitivity](https://security.snyk.io/vuln/SNYK-JS-SIMPLEGIT-15457646) (CVE-2026-28292) vulnerability reported in security scans. Addressed in [#33470](https://github.com/cypress-io/cypress/pull/33470)
 - Upgraded `minimatch` to `3.1.3` to address [CVE-2026-26996](https://nvd.nist.gov/vuln/detail/CVE-2026-26996), [CVE-2026-27903](https://nvd.nist.gov/vuln/detail/CVE-2026-27903), and [CVE-2026-27904](https://nvd.nist.gov/vuln/detail/CVE-2026-27904) ReDoS vulnerabilities reported in security scans. Addressed in [#33461](https://github.com/cypress-io/cypress/pull/33461).
 - Upgraded `serialize-javascript` to `7.0.3` to address [GHSA-5c6j-r48x-rmvq](https://github.com/advisories/GHSA-5c6j-r48x-rmvq) vulnerability reported in security scans. Addressed in [#33461](https://github.com/cypress-io/cypress/pull/33461).
+- Upgraded `flatted` from `3.2.9` to `3.4.2` to address [Prototype Pollution](https://security.snyk.io/vuln/SNYK-JS-FLATTED-15700433) (CVE-2026-33228) vulnerability reported in security scans. Addressed in [#33501](https://github.com/cypress-io/cypress/pull/33501)
 
 ## 15.12.0
 

packages/socket/package.json

@@ -26,7 +26,7 @@
     "engine.io": "6.4.2",
     "engine.io-client": "~5.0.0",
     "engine.io-parser": "4.0.2",
-    "flatted": "3.2.9",
+    "flatted": "3.4.2",
     "socket.io": "4.0.1",
     "socket.io-client": "4.0.1",
     "socket.io-parser": "4.0.5",

yarn.lock

@@ -17108,15 +17108,10 @@ flat@^5.0.2:
   resolved "https://registry.yarnpkg.com/flat/-/flat-5.0.2.tgz#8ca6fe332069ffa9d324c327198c598259ceb241"
   integrity sha512-b6suED+5/3rTpUBdG1gupIl8MPFCAMA0QXwmljLhvCUKcUvdE4gWky9zpuGCcXHOsz4J9wPGNWq6OKpmIzz3hQ==
 
-flatted@3.2.9:
-  version "3.2.9"
-  resolved "https://registry.yarnpkg.com/flatted/-/flatted-3.2.9.tgz#7eb4c67ca1ba34232ca9d2d93e9886e611ad7daf"
-  integrity sha512-36yxDn5H7OFZQla0/jFJmbIKTdZAQHngCedGxiMmpNfEZM0sdEeT+WczLQrjK6D7o2aiyLYDnkw0R3JK0Qv1RQ==
-
-flatted@^3.1.0, flatted@^3.2.9:
-  version "3.3.3"
-  resolved "https://registry.yarnpkg.com/flatted/-/flatted-3.3.3.tgz#67c8fad95454a7c7abebf74bb78ee74a44023358"
-  integrity sha512-GX+ysw4PBCz0PzosHDepZGANEuFCMLrnRTiEy9McGjmkCQYwRq4A/X786G/fjM/+OjsWSU1ZrY5qyARZmO/uwg==
+flatted@3.4.2, flatted@^3.1.0, flatted@^3.2.9:
+  version "3.4.2"
+  resolved "https://registry.yarnpkg.com/flatted/-/flatted-3.4.2.tgz#f5c23c107f0f37de8dbdf24f13722b3b98d52726"
+  integrity sha512-PjDse7RzhcPkIJwy5t7KPWQSZ9cAbzQXcafsetQoD7sOJRQlGikNbx7yZp2OotDnJyrDcbyRq3Ttb18iYOqkxA==
 
 floating-vue@5.2.2:
   version "5.2.2"