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VulnerabilityPublished Updated

CVE-2026-110676: Libcpanel json xs perl · Cpanel::JSON::XS versions before 4.80 for Perl allow memory exhaustion by

Affects libcpanel-json-xs-perlSource GCVE Database

0
Authoritative record:CVE-2026-110676· 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

  1. Disclosed: evidence found.

    CVE published 19 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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.

What to do

Affected software

ProductAffectedFixed in
Ubuntu 26.10libcpanel-json-xs-perlpkg:deb/ubuntu/libcpanel-json-xs-perl?arch=source&distro=stonkingOther threatsAffected
  • =4.40-1
  • =4.42-1
  • =4.42-1build1
Fixed in–
Ubuntu 26.04 LTSlibcpanel-json-xs-perlpkg:deb/ubuntu/libcpanel-json-xs-perl?arch=source&distro=resoluteOther threatsAffected
  • =4.39-2
  • =4.40-1
Fixed in–
Ubuntu 24.04 LTSlibcpanel-json-xs-perlpkg:deb/ubuntu/libcpanel-json-xs-perl?arch=source&distro=nobleOther threatsAffected
  • 4.37-1 – 4.37-1ubuntu0.1
5 affected builds
Fixed in–
Ubuntu 22.04 LTSlibcpanel-json-xs-perlpkg:deb/ubuntu/libcpanel-json-xs-perl?arch=source&distro=jammyOther threatsAffected
  • 4.25-1build1 – 4.27-1ubuntu0.2
6 affected builds
Fixed in–
Ubuntu 20.04 LTSlibcpanel-json-xs-perlpkg:deb/ubuntu/libcpanel-json-xs-perl?arch=source&distro=focalOther threatsAffected
  • 4.12-1 – 4.19-1ubuntu0.1
8 affected builds
Fixed in–
Ubuntu 18.04 LTSlibcpanel-json-xs-perlpkg:deb/ubuntu/libcpanel-json-xs-perl?arch=source&distro=bionicOther threatsAffected
  • =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 before 4.80 for Perl allow memory exhaustion by encoding exponent notation as full decimal digits under allow_bignum. With allow_bignum, a JSON number with a fraction or exponent decodes to a Math::BigFloat, which stores the exponent separately and so decodes cheaply. Encoding it untyped or as JSON_TYPE_FLOAT writes the plain decimal form with one digit per unit of exponent. Nothing bounds the exponent, so the 12-byte text [1e30000000] encodes to 30 MB. Untrusted JSON decoded with allow_bignum and encoded again can exhaust memory and CPU.

References

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