---
id: CVE-2026-110686
title: >-
  Cpanel::JSON::XS versions before 4.80 for Perl use freed filter callbacks when
  a filter removes itself during decoding in decode_hv
summary: >-
  Cpanel::JSON::XS versions before 4.80 for Perl use freed filter callbacks when
  a filter removes itself during decoding in decode_hv.


  A decode copies the parser's filter_json_object and
  filter_json_single_key_object callbacks without tak…
severity: none
cwe:
  - CWE-416
product: Cpanel-JSON-XS
affected:
  - Cpanel-JSON-XS < 4.80
published: '2026-10-19'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T18:12:19.804Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-110686'
references:
  - url: >-
      https://github.com/rurban/Cpanel-JSON-XS/commit/c3e7e3c5b0b72d82b072c6a7cfb8c34cec4c7ea2.patch
  - url: 'https://metacpan.org/release/RURBAN/Cpanel-JSON-XS-4.80/changes'
tags:
  - cve.org
ingestedAt: '2026-10-19T18:35:50.142Z'
---

## Overview

Cpanel::JSON::XS versions before 4.80 for Perl use freed filter callbacks when a filter removes itself during decoding in decode_hv.

A decode copies the parser's filter_json_object and filter_json_single_key_object callbacks without taking references to them. A filter callback that removes the last single-key filter frees the callback table while the decode in progress still uses it. The next object is dispatched through freed memory and can crash the process.

## Affected

- `Cpanel-JSON-XS < 4.80`

## Remediation

Upgrade to Cpanel-JSON-XS 4.80 or later.