No exploitation reported

CVE-2026-110684

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

No exploitation reported by the sources we read.

Published2026-10-19
WeaknessCWE-401

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 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.

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-2026-110684?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-110684?format=csv
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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-2026-110684 Red Hat Product Security
perl-Cpanel-JSON-XS: Memory leak in encode_stringify when encoding overloaded objects

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 decisionnone2026-10-29
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.18.12026-10-29
CNAweakness (CWE)CWE-401read 2026-10-30
FIRST EPSSEPSS score0.2 %2026-10-29

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Published: 2026-10-19
Last Modified: 2026-10-29
NVD status: Awaiting Analysis

Frequently asked questions

What is CVE-2026-110684?

Is CVE-2026-110684 actively exploited?

Active exploitation of CVE-2026-110684 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-2026-110684?

CVE-2026-110684 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.

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