CVE-2026-114629 ETHER CVE debrief

Who should care

Defenders responsible for Perl applications using Web::Simple versions before 0.035 should verify exposure and assess potential security consequences. This includes operators managing affected systems, platform administrators, vulnerability management teams, and security teams responsible for reviewing and mitigating potential security risks.

Why it matters

CVE-2026-114629 is a high-severity vulnerability in Web::Simple versions before 0.035 for Perl that can lead to potential security consequences if exploited.

• Verify exposure in Perl applications using Web::Simple versions before 0.035
• Assess potential security consequences of sending a Content-Length far larger than the body actually sent
• Update Web::Simple to version 0.035 or later if possible

Technical summary

The vulnerability is caused by Web::Dispatch::ParamParser::get_unpacked_body_from reading an application/x-www-form-urlencoded body using a single read call with no cap, and the return value ignored. Perl's read grows the buffer to the requested length before reading, so the declared Content-Length determines the allocation. This issue can be triggered through any route whose dispatch specification has a % body-parameter match, such as sub (POST + %name=), by sending a Content-Length far larger than the body actually sent.

Defensive priority

Defenders should prioritize verifying exposure in Perl applications using Web::Simple versions before 0.035 and assessing potential security consequences.

Recommended defensive actions

• Verify exposure in Perl applications using Web::Simple versions before 0.035
• Assess potential security consequences of sending a Content-Length far larger than the body actually sent
• Update Web::Simple to version 0.035 or later if possible
• 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 vulnerability is caused by Web::Dispatch::ParamParser::get_unpacked_body_from reading an application/x-www-form-urlencoded body using a single read call with no cap, and the return value ignored. Perl's read grows the buffer to the requested length before reading, so the declared Content-Length determines the allocation.

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.