---
id: CVE-2026-110673
title: >-
  Cpanel::JSON::XS versions before 4.80 for Perl allow stack exhaustion via
  nested tagged values under allow_tags in decode_tag
summary: >-
  Cpanel::JSON::XS versions before 4.80 for Perl allow stack exhaustion via
  nested tagged values under allow_tags in decode_tag.


  With allow_tags, "(" starts a tagged value. Its tag and value are decoded
  recursively, and each can start ano…
severity: none
cwe:
  - CWE-674
product: Cpanel-JSON-XS
affected:
  - Cpanel-JSON-XS < 4.80
published: '2026-10-19'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T18:11:15.412Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-110673'
references:
  - url: >-
      https://github.com/rurban/Cpanel-JSON-XS/commit/995eb484a9351753e2a8ec3317918b5b4a4e086a.patch
  - url: 'https://metacpan.org/release/RURBAN/Cpanel-JSON-XS-4.80/changes'
tags:
  - cve.org
ingestedAt: '2026-10-19T18:35:50.146Z'
---

## Overview

Cpanel::JSON::XS versions before 4.80 for Perl allow stack exhaustion via nested tagged values under allow_tags in decode_tag.

With allow_tags, "(" starts a tagged value. Its tag and value are decoded recursively, and each can start another tagged value. Unlike arrays and objects, this nesting is not counted against max_depth.

A run of "(" bytes exhausts the C stack and triggers an uncatchable segmentation fault regardless of max_depth.

## Affected

- `Cpanel-JSON-XS < 4.80`

## Remediation

Upgrade to Cpanel-JSON-XS 4.80 or later.