CVE-2026-107794 SMUELLER CVE debrief

Who should care

Defenders responsible for Perl applications using ExtUtils::Typemaps::STL::List versions before 1.07 should assess exposure and prioritize verification and remediation. This includes operators, platform administrators, vulnerability management teams, and security teams who manage or use Perl applications with vulnerable versions of ExtUtils::Typemaps::STL::List. They should review the current version, plan for upgrades, and monitor for signs of memory

Why it matters

Defenders should care about CVE-2026-107794 because it can lead to memory exhaustion in Perl applications using vulnerable versions of ExtUtils::Typemaps::STL::List, requiring verification and potential remediation.

• Potential memory exhaustion due to large array allocation.
• Need for verification of current version and potential upgrade to version 1.07 or later.
• Monitoring for signs of memory exhaustion issues.

Technical summary

The vulnerability occurs in ExtUtils::Typemaps::STL::List versions before 1.07 for Perl, where the OUTPUT typemaps call av_extend( av, len-1 ) on an empty list, leading to an underflow and allocation of an array with 2^32 slots, potentially causing memory exhaustion. This issue can be mitigated by verifying the version of ExtUtils::Typemaps::STL::List and upgrading to version 1.07 or later. The vulnerability can cause significant memory exhaustion issues, potentially leading to system crashes or instability. Defenders should prioritize verifying and upgrading to version 1.07 or later of ExtUtils::Typemaps::STL::List to prevent potential memory exhaustion.

Defensive priority

Defenders should prioritize verifying and upgrading to version 1.07 or later of ExtUtils::Typemaps::STL::List to prevent potential memory exhaustion.

Recommended defensive actions

• Verify the version of ExtUtils::Typemaps::STL::List is 1.07 or later.
• Upgrade to version 1.07 or later of ExtUtils::Typemaps::STL::List if necessary.
• Monitor for potential memory exhaustion issues.
• 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 details on the vulnerability, including its description and affected versions. The vulnerability was discovered in ExtUtils::Typemaps::STL::List versions before 1.07 for Perl. The OUTPUT typemaps call av_extend( av, len-1 ) on an empty list, leading to an underflow and allocation of an array with 2^32 slots. Defenders should verify the version of ExtUtils::Typemaps::STL::List and upgrade to version 1.07 or later if necessary. Evidence limits and source grounding indicate that the vulnerability is

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.