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PatchSiren cyber security CVE debrief

CVE-2026-110687 RURBAN CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-10-19T18:12:22.028Z and has not been modified since then. Cpanel::JSON::XS versions from 4.43 before 4.80 for Perl misorder byte-string keys during canonical encoding in utf16_cmp. This occurs when any key in a hash is UTF-8 flagged, causing every key to be decoded as UTF-8 for comparison, including byte-string keys written out as Latin-1 characters. The vulnerability can cause issues with data integrity and security in Perl applications using this module.

Vendor
RURBAN
Product
Cpanel-JSON-XS
CVSS
Unknown
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-19
Original CVE updated
2026-10-19
Advisory published
2026-10-19
Advisory updated
2026-10-19

Who should care

Defenders responsible for Perl applications using Cpanel::JSON::XS should assess exposure and prioritize verification and remediation. This includes operators, platform administrators, vulnerability management teams, and security teams who need to ensure the security and integrity of their systems.

Why it matters

Defenders should prioritize verifying Cpanel::JSON::XS versions from 4.43 before 4.80 for Perl, assessing exposure in Perl applications using this module, and reviewing vendor remediation due to the potential for misordered byte-string keys during canonical encoding.

  • Verification of Cpanel::JSON::XS versions in Perl applications
  • Assessment of exposure in Perl applications using this module
  • Remediation through patching or updating to version 4.80

Technical summary

Cpanel::JSON::XS versions from 4.43 before 4.80 for Perl misorder byte-string keys during canonical encoding in utf16_cmp. This occurs when any key in a hash is UTF-8 flagged, causing every key to be decoded as UTF-8 for comparison, including byte-string keys written out as Latin-1 characters. The vulnerability can cause issues with data integrity and security in Perl applications using this module. The issue arises from the sorting of keys by UTF-16 code units, which can lead to inconsistencies in canonical encoding.

Defensive priority

Defenders should prioritize verifying Cpanel::JSON::XS versions from 4.43 before 4.80 for Perl, assessing exposure in Perl applications using this module, and reviewing vendor remediation.

Recommended defensive actions

  • Verify Cpanel::JSON::XS versions from 4.43 before 4.80 for Perl in your environment
  • Assess exposure in Perl applications using this module
  • Review vendor remediation and apply patches or updates
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
  • Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and source item provide details on the misordering of byte-string keys during canonical encoding in utf16_cmp for Cpanel::JSON::XS versions from 4.43 before 4.80 for Perl. The source item provides details on the vulnerability. Official CVE Program record with source-provided CVE metadata and Official NIST NVD detail page and source-specific vulnerability assessment provide additional context.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-110687 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-110687

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-110687 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-110687

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.