Description
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.
Published: 2026-10-19
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
AI Analysis

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Remediation

Vendor Solution

Upgrade to Cpanel-JSON-XS 4.80 or later.

Tracking

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Advisories

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History

Fri, 30 Oct 2026 11:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 19 Oct 2026 21:00:00 +0000

Type Values Removed Values Added
First Time appeared Rurban
Rurban cpanel::json::xs
Vendors & Products Rurban
Rurban cpanel::json::xs

Mon, 19 Oct 2026 18:30:00 +0000

Type Values Removed Values Added
Description 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.
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
Weaknesses CWE-787
References

Subscriptions

Rurban Cpanel::json::xs
cve-icon MITRE

Status: PUBLISHED

Assigner: CPANSec

Published:

Updated: 2026-10-30T11:03:11.404Z

Reserved: 2026-10-14T13:25:23.957Z

Link: CVE-2026-110680

cve-icon Vulnrichment

Updated: 2026-10-30T11:02:28.318Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-19T19:17:21.657

Modified: 2026-10-30T11:17:31.650

Link: CVE-2026-110680

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-30T13:30:12Z

Weaknesses