CVE-2026-111063 aio-libs CVE debrief

Who should care

Defenders responsible for AIOHTTP applications using shared cookies should assess exposure and prioritize verification of AIOHTTP version 3.14.4 or later. This includes reviewing and updating configurations to ensure Secure attribute enforcement for shared cookies. Operators, platform administrators, vulnerability management teams, and security teams should review the CVE record and assess potential impact on their systems. They should also verify AIOHTTP

Why it matters

CVE-2026-111063 AIOHTTP Secure attribute not enforced for shared cookie. Defenders should prioritize verifying AIOHTTP version 3.14.4 or later for systems using shared cookies to prevent potential exposure of sensitive information.

• Potential exposure of sensitive information through unencrypted transmission.
• Need to verify AIOHTTP version and configurations to ensure Secure attribute enforcement.
• Possible impact on confidentiality due to insecure cookie transmission.

Technical summary

AIOHTTP versions prior to 3.14.4 do not enforce the Secure attribute for shared cookies, potentially allowing sensitive information to be transmitted unencrypted. This issue is fixed in version 3.14.4. The Secure attribute for a shared cookie is not enforced, allowing an attacker to cause a shared cookie marked Secure to be sent with an unencrypted request. AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. The vulnerability can result in potential exposure of sensitive information through unencrypted transmission.

Defensive priority

Defenders should prioritize verifying AIOHTTP version 3.14.4 or later for systems using shared cookies.

Recommended defensive actions

• Verify AIOHTTP version 3.14.4 or later is in use for systems relying on shared cookies.
• Review and update configurations to ensure Secure attribute is properly set for shared cookies.
• Monitor for potential misuse of unencrypted cookies in AIOHTTP applications.
• 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 record and source item indicate that AIOHTTP versions prior to 3.14.4 do not enforce the Secure attribute for shared cookies, potentially allowing unencrypted transmission of sensitive information.

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.