---
id: CVE-2026-110680
title: >-
  Cpanel::JSON::XS versions from 4.20 before 4.80 for Perl write out of bounds
  when a tied or shared hash grows during canonical encoding in encode_hv
summary: >-
  Cpanel::JSON::XS versions from 4.20 before 4.80 for Perl write out of bounds
  when a tied or shared hash grows during canonical encoding in encode_hv.


  With canonical, the keys of a tied or threads::shared hash are counted before
  a second…
severity: none
cwe:
  - CWE-787
product: Cpanel-JSON-XS
affected:
  - Cpanel-JSON-XS >= 4.20 < 4.80
published: '2026-10-19'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T18:12:01.950Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-110680'
references:
  - url: >-
      https://github.com/rurban/Cpanel-JSON-XS/commit/44c4591cc62ea7f453a0ed931abf24394e1560a1.patch
  - url: 'https://metacpan.org/release/RURBAN/Cpanel-JSON-XS-4.80/changes'
tags:
  - cve.org
ingestedAt: '2026-10-19T18:35:50.143Z'
---

## Overview

Cpanel::JSON::XS versions from 4.20 before 4.80 for Perl write out of bounds when a tied or shared hash grows during canonical encoding in encode_hv.

With canonical, the keys of a tied or threads::shared hash are counted before a second pass collects them for sorting. The encoder uses a fixed 64-entry stack array or, for larger counts, a heap array sized from the first pass. If the second pass exceeds that capacity, entries are written out of bounds before the counts are compared.

This corrupts stack or heap memory and can crash the process.

## Affected

- `Cpanel-JSON-XS >= 4.20 < 4.80`

## Remediation

Upgrade to Cpanel-JSON-XS 4.80 or later.