---
id: CVE-2026-110681
title: >-
  Cpanel::JSON::XS versions before 4.80 for Perl use the parent interpreter's
  scalars from a parser object cloned into a new ithread
summary: >-
  Cpanel::JSON::XS versions before 4.80 for Perl use the parent interpreter's
  scalars from a parser object cloned into a new ithread.


  A parser object holds its callbacks and its incremental parse buffer as raw
  scalar pointers. When a thre…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H'
cvssSource: adp
cwe:
  - CWE-416
product: Cpanel-JSON-XS
affected:
  - Cpanel-JSON-XS < 4.80
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-10-30T11:04:37.574678Z'
published: '2026-10-19'
updated: '2026-10-30'
sourceUpdated: '2026-10-30T11:04:48.764Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-110681'
references:
  - url: >-
      https://github.com/rurban/Cpanel-JSON-XS/commit/c53eefbaa59c344abd4c71762118da04280987e8.patch
  - url: 'https://metacpan.org/release/RURBAN/Cpanel-JSON-XS-4.80/changes'
tags:
  - cve.org
epss: 0.00429
epssPercentile: 0.37136
ingestedAt: '2026-10-19T18:35:50.146Z'
---

## Overview

Cpanel::JSON::XS versions before 4.80 for Perl use the parent interpreter's scalars from a parser object cloned into a new ithread.

A parser object holds its callbacks and its incremental parse buffer as raw scalar pointers. When a thread is created, these are copied into the new interpreter unchanged, so the child's parser uses, and later frees, scalars that belong to the parent and may already have been freed there.

A parser created before a thread starts and used inside it can call freed callbacks, corrupt reference counts and crash the process.

## Affected

- `Cpanel-JSON-XS < 4.80`

## Remediation

Upgrade to Cpanel-JSON-XS 4.80 or later.