Source: node-flatted Version: 3.4.1~ds-1 Severity: important Tags: security upstream X-Debbugs-Cc: [email protected], Debian Security Team <[email protected]>
Hi, The following vulnerability was published for node-flatted. CVE-2026-33228[0]: | flatted is a circular JSON parser. Prior to version 3.4.2, the | parse() function in flatted can use attacker-controlled string | values from the parsed JSON as direct array index keys, without | validating that they are numeric. Since the internal input buffer is | a JavaScript Array, accessing it with the key "__proto__" returns | Array.prototype via the inherited getter. This object is then | treated as a legitimate parsed value and assigned as a property of | the output object, effectively leaking a live reference to | Array.prototype to the consumer. Any code that subsequently writes | to that property will pollute the global prototype. This issue has | been patched in version 3.4.2. If you fix the vulnerability please also make sure to include the CVE (Common Vulnerabilities & Exposures) id in your changelog entry. For further information see: [0] https://security-tracker.debian.org/tracker/CVE-2026-33228 https://www.cve.org/CVERecord?id=CVE-2026-33228 [1] https://github.com/WebReflection/flatted/security/advisories/GHSA-rf6f-7fwh-wjgh [2] https://github.com/WebReflection/flatted/commit/885ddcc33cf9657caf38c57c7be45ae1c5272802 Please adjust the affected versions in the BTS as needed. Regards, Salvatore
