CVE-2026-94084 OISF CVE debrief

Who should care

Defenders responsible for Suricata installations should assess exposure and prioritize patching or upgrading to Suricata version 8.0.7 or later. This includes security teams, network administrators, and IT professionals managing Suricata configurations and monitoring network security. They should review Suricata versions, rule sets, and potential exposure to this vulnerability. Additionally, they should consider the operational impacts of this use-after-

Why it matters

Defenders should prioritize patching or upgrading to Suricata version 8.0.7 or later to mitigate this use-after-free vulnerability. The vulnerability occurs when a transaction is inspected by rules that use http.response_header with and without a transform, leading to a potential Http2ThreadMultiBuf use-after-free condition. Further investigation is required to fully understand the impact and scope of this vulnerability.

• Potential for remote code execution or denial of service
• Requires verification of Suricata version and rule compatibility
• May require updates to monitoring and logging configurations

Technical summary

The vulnerability occurs when a transaction is inspected by rules that use http.response_header with and without a transform, leading to a potential Http2ThreadMultiBuf use-after-free condition in Suricata before version 8.0.7. This technical issue arises from the way Suricata handles HTTP/2 transactions and rule configurations, which can result in a use-after-free condition. Understanding the technical details of this vulnerability is crucial for defenders to assess the risk and implement appropriate mitigations. The vulnerability highlights the importance of keeping Suricata up-to-date and ensuring compatibility between Suricata versions and rule sets.

Defensive priority

Defenders should prioritize patching or upgrading to Suricata version 8.0.7 or later to mitigate this vulnerability.

Recommended defensive actions

• Patch or upgrade to Suricata version 8.0.7 or later
• Review and update Suricata rules to ensure they are compatible with version 8.0.7 or later
• Monitor Suricata logs for potential exploitation attempts
• Verify Suricata version and rule compatibility in your environment
• Assess exposure and prioritize patching or upgrading
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability. Further investigation and verification are required to fully understand the impact and scope of this vulnerability. The lack of detailed information necessitates a cautious approach, with defenders needing to review Suricata configurations, rule sets, and potential exposure. Additional research may be needed to determine the vulnerability's effects on various network environments and to identify any potential mitigations or workarounds.

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.