CVE-2026-110672 RURBAN CVE debrief

Who should care

Perl developers and administrators using Cpanel::JSON::XS, especially those processing untrusted input, should be aware of this vulnerability and take steps to mitigate it. Affected operators, platforms, and security teams should review the vulnerability and its potential impact on their systems. They should prioritize patching or updating Cpanel::JSON::XS to version 4.80 or later, and consider compensating controls such as limiting exposure to untrusted输入

Why it matters

CVE-2026-110672 is a memory leak vulnerability in Cpanel::JSON::XS for Perl. Defenders should prioritize patching, limit exposure to untrusted input, and monitor for unusual memory usage. Evidence is limited, and specific exploitation details are unknown.

• Potential for denial of service through memory exhaustion
• Information disclosure through memory analysis
• Increased risk in environments with untrusted input
• Need for verification of affected applications and versions

Technical summary

Cpanel::JSON::XS versions before 4.80 for Perl are vulnerable to a memory leak. When decoding JSON objects, if an object is rejected due to a duplicate key or a missing colon, the decoded key of the object is leaked. This can lead to memory exhaustion if an attacker can repeatedly send crafted JSON objects to a vulnerable application. The vulnerability affects Perl applications using Cpanel::JSON::XS, especially those processing untrusted input. Defenders should prioritize patching or updating Cpanel::JSON::XS to version 4.80 or later, and consider compensating controls such as limiting exposure to untrusted input and monitoring for unusual memory usage.

Defensive priority

Defenders should prioritize patching or updating Cpanel::JSON::XS to version 4.80 or later, especially in environments where Perl applications are used with untrusted input.

Recommended defensive actions

• Update Cpanel::JSON::XS to version 4.80 or later
• Review and limit exposure of Perl applications using Cpanel::JSON::XS to untrusted input
• Monitor for unusual memory usage in affected applications
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• 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 vulnerability, including its impact on memory and potential for denial of service. However, specific details about affected applications or exploitation are limited.

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.