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Improperly Controlled Modification of Dynamically-Determined Object Attributes The advisory has been revoked - it doesn't affect any version of package redhat-ds:12/389-ds-base  (opens in a new tab)

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EPSS
0.86% (59th percentile)

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  • Snyk IDSNYK-RHEL10-REDHATDS-15787069
  • published26 Mar 2026
  • disclosed20 Mar 2026
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Introduced: 20 Mar 2026

CVE-2026-33228  (opens in a new tab)
CWE-915  (opens in a new tab)

Amendment

The Red Hat security team deemed this advisory irrelevant for RHEL:10.

NVD Description

Note: Versions mentioned in the description apply only to the upstream redhat-ds:12/389-ds-base package and not the redhat-ds:12/389-ds-base package as distributed by RHEL.

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.