CVE-2026-110675 Rurban CVE debrief

Who should care

Defenders responsible for Perl applications using Cpanel::JSON::XS should assess exposure and consider upgrading to version 4.80 or later. This includes operators, platform administrators, vulnerability management teams, and security teams who need to verify the version of Cpanel::JSON::XS in use and assess exposure to potential attacks. The vulnerability management team should prioritize verifying the version of Cpanel::JSON::XS in use and assessing the  

Why it matters

Defenders should prioritize verifying the version of Cpanel::JSON::XS in use and assessing exposure to potential attacks due to the acceptance of malformed UTF-8 in bare hash keys.

• Potential issues with decoded hash due to malformed UTF-8 in bare hash keys
• Need to verify version of Cpanel::JSON::XS in use
• Potential need to upgrade to version 4.80 or later

Technical summary

Cpanel::JSON::XS versions from 4.33 before 4.80 for Perl accept malformed UTF-8 in bare hash keys under allow_barekey in decode_hv. This could potentially lead to issues with the decoded hash. The vulnerability exists due to the acceptance of malformed UTF-8 in bare hash keys, which can cause problems when later operations on the key are performed. The affected product context indicates that Perl applications using Cpanel::JSON::XS should be assessed for exposure. Defensive impact suggests that defenders should prioritize verifying the version of Cpanel::JSON::XS in use and assessing exposure to potential attacks.

Defensive priority

Defenders should prioritize verifying the version of Cpanel::JSON::XS in use and assessing exposure to potential attacks.

Recommended defensive actions

• Verify the version of Cpanel::JSON::XS in use
• Assess exposure to potential attacks
• Consider upgrading to version 4.80 or later
• 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
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide limited information about the vulnerability. Further verification is required to determine the full scope of the issue. Defenders should verify the version of Cpanel::JSON::XS in use and assess exposure to potential attacks. The source grounding indicates that the vulnerability exists in Cpanel::JSON::XS versions from 4.33 before 4.80 for Perl. Evidence limits suggest that additional information may be needed to fully understand the vulnerability.

Sources and 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.