CVE-2026-110674VulnerabilityPublished 19 Oct 2026Updated 28 Oct 2026

Libcpanel json xs perl: Cpanel::JSON::XS versions from 4.33 before 4.80 for Perl miss duplicate non-ASCII bare keys

Affects libcpanel-json-xs-perlSource GCVE Database

Authoritative record:CVE-2026-110674· High

Not known to be exploited.

Data as of 28 Oct 2026, 22:31 UTC

Severity

High

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 4.33 before 4.80 for Perl miss duplicate non-ASCII bare keys, allowing type confusion under dupkeys_as_arrayref in decode_hv. With allow_barekey, which relaxed enables, a bare key containing a non-ASCII byte is stored as UTF-8 but looked up as raw bytes, so a repeated key escapes the duplicate-key check and replaces the earlier value. From 4.41, under dupkeys_as_arrayref, a bare repeat replaces the array that collects a key's values with a plain value, and the next quoted repeat pushes onto that value as if it were an array. A JSON integer there is dereferenced as a pointer. Untrusted JSON decoded with relaxed and dupkeys_as_arrayref can crash the process or dereference an address chosen by a JSON number.

References

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