Improper Validation of Specified Quantity in Input Affecting prism package, versions <5.14.3-r13


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.03% (9th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-PRISM-15878779
  • published3 Apr 2026
  • disclosed24 Mar 2026

Introduced: 24 Mar 2026

NewCVE-2026-33349  (opens in a new tab)
CWE-1284  (opens in a new tab)

How to fix?

Upgrade Chainguard prism to version 5.14.3-r13 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream prism package and not the prism package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

fast-xml-parser allows users to process XML from JS object without C/C++ based libraries or callbacks. From version 4.0.0-beta.3 to before version 5.5.7, the DocTypeReader in fast-xml-parser uses JavaScript truthy checks to evaluate maxEntityCount and maxEntitySize configuration limits. When a developer explicitly sets either limit to 0 — intending to disallow all entities or restrict entity size to zero bytes — the falsy nature of 0 in JavaScript causes the guard conditions to short-circuit, completely bypassing the limits. An attacker who can supply XML input to such an application can trigger unbounded entity expansion, leading to memory exhaustion and denial of service. This issue has been patched in version 5.5.7.

CVSS Base Scores

version 3.1