CVE-2026-74848 Apache Software Foundation CVE debrief

Who should care

Apache APISIX users, administrators, and security teams should be aware of this vulnerability and take necessary actions to mitigate it. This includes reviewing their APISIX deployments, identifying affected versions, and planning for upgrades to version 3.18.0. Additionally, security teams should monitor for potential attacks and review compensating controls for exposed systems while remediation is scheduled and verified. Operators and platform administrators should also be aware of the potential impact on their systems and take steps to minimize exposure.

Technical summary

CVE-2026-74848 is an Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in Apache APISIX. An attacker could make other clients receive attacker-chosen or other users' responses on serverless-plugin routes. This issue affects Apache APISIX versions from 2.12.0 through 3.17.0. The vulnerability can be mitigated by upgrading to version 3.18.0, which fixes the issue. It is essential for administrators to review their APISIX configurations and ensure that they are not exposed to this vulnerability.

Defensive priority

Apache APISIX users should prioritize upgrading to version 3.18.0 to mitigate the HTTP Request/Response Smuggling vulnerability.

Recommended defensive actions

• Upgrade Apache APISIX to version 3.18.0 or later
• Review and update affected systems
• Monitor for potential attacks
• 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-2026-74848 vulnerability affects Apache APISIX versions from 2.12.0 through 3.17.0. Users are recommended to upgrade to version 3.18.0. Evidence is based on official CVE Program and NVD records. Defenders should verify the affected versions in their environment and plan for an upgrade to mitigate the vulnerability. Additionally, they should review the official advisory for any specific guidance on mitigation and verify the integrity of their APISIX installations.

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.