No exploitation reported

CVE-2026-110680

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

No exploitation reported by the sources we read.

Published2026-10-19
WeaknessCWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2026-10-1919:17CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-30 09:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-110680?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-110680?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

CVE-2026-110680 Red Hat Product Security
perl-Cpanel-JSON-XS: Out-of-bounds write during canonical encoding

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVE recordread 2026-10-30
CISA-ADPSSVC decisionnone2026-10-30
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.17.5read 2026-10-30
CNAweakness (CWE)CWE-787read 2026-10-30
FIRST EPSSEPSS score0.2 %2026-10-29

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2026-10-19
Last Modified: 2026-10-30
NVD status: Awaiting Analysis

Frequently asked questions

What is CVE-2026-110680?

Is CVE-2026-110680 actively exploited?

Active exploitation of CVE-2026-110680 has not been confirmed. Its EPSS score was 0.2% on 2026-10-29, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-110680?

CVE-2026-110680 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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