# CVE-2026-110684: libcpanel-json-xs-perl: Cpanel::JSON::XS versions from 3.0202 before 4.80 for Perl leak memory and retain overloaded objects when encoding va...

CVE-2026-110684 is fixed in 4 products on 1 platform, first by DEBIAN-CVE-2026-110684, released October 24, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-110684
- Priority: High
- CVSS: 8.1 (high)
- EPSS: 0.0045
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 15, 2026

## Description

Cpanel::JSON::XS versions from 3.0202 before 4.80 for Perl leak memory and retain overloaded objects when encoding values as strings in encode_stringify.  encode_stringify writes a value in its string form under allow_stringify, under convert_blessed for objects without TO_JSON, and under allow_bignum. For an array or hash object with a "" overload, and from 4.20 a scalar object, it takes an extra reference that is never released, so the object and everything it references are never freed. From 4.10 it also never frees its copy of the string.  Repeatedly encoding data that contains such values grows process memory without bound.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libcpanel-json-xs-perl Debian 14 | 4.80-1 | [DEBIAN-CVE-2026-110684](https://patchblox.com/security/data/fix/linux/debian-cve-2026-110684.md) | Oct 24, 2026 |
| Linux | perl-Cpanel-JSON-XS Fedora 43 | 4.80-1.fc43 | [FEDORA-2026-4447E52D23](https://patchblox.com/security/data/fix/linux/fedora-2026-4447e52d23.md) | Nov 7, 2026 |
| Linux | perl-Cpanel-JSON-XS amzn 2023 | 4.25-2.amzn2023.0.10 | [ALAS2023-2026-3352](https://patchblox.com/security/data/fix/linux/alas2023-2026-3352.md) | Nov 7, 2026 |
| Linux | perl-Cpanel-JSON-XS opensuse-leap 16.0 | 4.800.0-bp160.1.1 | [OPENSUSE-SU-2026:22187-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22187-1.md) | Nov 7, 2026 |
| Linux | perl-Cpanel-JSON-XS sles 15.7 | 4.800.0-150700.3.9.1 | [SUSE-SU-2026:4926-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4926-1.md) | Nov 7, 2026 |
| Linux | perl-Cpanel-JSON-XS-debuginfo Fedora 43 | 4.80-1.fc43 | [FEDORA-2026-4447E52D23](https://patchblox.com/security/data/fix/linux/fedora-2026-4447e52d23.md) | Nov 7, 2026 |
| Linux | perl-Cpanel-JSON-XS-debuginfo amzn 2023 | 4.25-2.amzn2023.0.10 | [ALAS2023-2026-3352](https://patchblox.com/security/data/fix/linux/alas2023-2026-3352.md) | Nov 7, 2026 |
| Linux | perl-Cpanel-JSON-XS-debugsource Fedora 43 | 4.80-1.fc43 | [FEDORA-2026-4447E52D23](https://patchblox.com/security/data/fix/linux/fedora-2026-4447e52d23.md) | Nov 7, 2026 |
| Linux | perl-Cpanel-JSON-XS-debugsource amzn 2023 | 4.25-2.amzn2023.0.10 | [ALAS2023-2026-3352](https://patchblox.com/security/data/fix/linux/alas2023-2026-3352.md) | Nov 7, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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