CVE-2026-49975 Apache Software Foundation CVE debrief

Who should care

cPanel administrators and security teams responsible for managing EasyApache 4 configurations should assess exposure, prioritize verification, and apply updates to prevent potential memory consumption issues. They should also verify cPanel configurations and EasyApache 4 versions, and monitor for suspicious HTTP/2 traffic.

Why it matters

CVE-2026-49975 is a high-severity vulnerability in EasyApache 4 that requires attention from cPanel administrators and security teams to assess exposure, prioritize verification, and apply updates to prevent potential memory consumption issues.

• Potential for excessive memory consumption due to malicious HTTP/2 cookie headers
• Need for verification of cPanel configurations and EasyApache 4 versions
• Prioritization of updates and monitoring for suspicious traffic

Technical summary

The CVE-2026-49975 vulnerability in EasyApache 4 allows attackers to craft malicious HTTP/2 cookie headers that can consume excessive memory. The fix makes cookie headers count against LimitRequestFields. This update requires attention from cPanel administrators and security teams to assess exposure, prioritize verification, and apply updates to prevent potential memory consumption issues. The vulnerability can be mitigated by verifying cPanel configurations and EasyApache 4 versions, and applying updates to prevent potential memory consumption issues.

Defensive priority

Assess exposure, prioritize verification, and apply updates for cPanel configurations using EasyApache 4

Recommended defensive actions

• Assess cPanel configurations for exposure to HTTP/2 attacks
• Verify and apply EasyApache 4 updates
• Monitor for suspicious HTTP/2 traffic
• 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 cPanel changelog provide details on the patched vulnerability in EasyApache 4. The vulnerability allows attackers to craft malicious HTTP/2 cookie headers that can consume excessive memory. The fix makes cookie headers count against LimitRequestFields. cPanel administrators and security teams should verify cPanel configurations and EasyApache 4 versions, and apply updates to prevent potential memory consumption issues. The CVE record was published on 2026-06-08T16:16:44.223Z and has not been modified since then.

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.