CVE-2026-110684VulnerabilityPublished 19 Oct 2026Updated 28 Oct 2026

Libcpanel json xs perl: Cpanel::JSON::XS versions from 3.0202 before 4.80 for Perl leak memory and retain overloaded

Affects libcpanel-json-xs-perlSource GCVE Database

Authoritative record:CVE-2026-110684· Medium

Not known to be exploited.

Data as of 28 Oct 2026, 22:31 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

Exploitation evidence

Disclosed: evidence found.
CVE published 19 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Ubuntu 26.10libcpanel-json-xs-perl`pkg:deb/ubuntu/libcpanel-json-xs-perl?arch=source&distro=stonking`Other threats	Affected =4.40-1 =4.42-1 =4.42-1build1	Fixed in–
Ubuntu 26.04 LTSlibcpanel-json-xs-perl`pkg:deb/ubuntu/libcpanel-json-xs-perl?arch=source&distro=resolute`Other threats	Affected =4.39-2 =4.40-1	Fixed in–
Ubuntu 24.04 LTSlibcpanel-json-xs-perl`pkg:deb/ubuntu/libcpanel-json-xs-perl?arch=source&distro=noble`Other threats	Affected 4.37-1 – 4.37-1ubuntu0.1 5 affected builds	Fixed in–
Ubuntu 22.04 LTSlibcpanel-json-xs-perl`pkg:deb/ubuntu/libcpanel-json-xs-perl?arch=source&distro=jammy`Other threats	Affected 4.25-1build1 – 4.27-1ubuntu0.2 6 affected builds	Fixed in–
Ubuntu 20.04 LTSlibcpanel-json-xs-perl`pkg:deb/ubuntu/libcpanel-json-xs-perl?arch=source&distro=focal`Other threats	Affected 4.12-1 – 4.19-1ubuntu0.1 8 affected builds	Fixed in–
Ubuntu 18.04 LTSlibcpanel-json-xs-perl`pkg:deb/ubuntu/libcpanel-json-xs-perl?arch=source&distro=bionic`Other threats	Affected =3.0225-1build1 =3.0239-1	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

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.

References

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