CVE-2026-70646 vovchic17 CVE debrief

Who should care

Users of aiosend versions prior to 3.0.7 should be aware of this vulnerability and take steps to mitigate it. This includes applying patch version 3.0.7 or later, restricting request body size, rate-limiting webhook endpoints, and/or rejecting oversized requests before JSON parsing. Operators, platform administrators, vulnerability management teams, and security teams should review the affected scope and severity to determine the necessary actions for their environments. Additionally, defenders should verify the integrity of their systems and monitor for potential exploitation attempts. Compensating controls, such as monitoring and asset inventory, can also be implemented to reduce the risk of exposure. It is essential to track exceptions, retest remediated assets, and close the item only after evidence is documented to ensure the vulnerability is properly addressed. Security teams should also review relevant logs for exposed assets that need extra review and consider implementing rollback/change windows to minimize potential downtime. By taking these steps, organizations can minimize the risk associated with this vulnerability and protect their systems from potential attacks. To further enhance security, consider implementing source tracking to monitor for potential exploitation attempts and improve incident response. Overall, a comprehensive approach to vulnerability management, including patching, monitoring, and compensating controls, is essential to mitigate the risk of this vulnerability effectively. Security teams should prioritize patching and verifying the integrity of their systems to prevent potential exploitation. Furthermore, it is crucial to stay informed about the latest developments regarding this vulnerability and adjust mitigation strategies accordingly. By doing so, organizations can ensure the security and integrity of their systems and protect against potential threats. The CVE record was published on 2026-08-06T15:17:27.750Z and has not been modified since then, emphasizing the importance of prompt action to address this vulnerability. To ensure the security of their systems, users should apply the patch or implement mitigations as soon as

Technical summary

The `WebhookHandler.feed_update()` method in aiosend versions prior to 3.0.7 deserializes the entire request body before verifying the HMAC signature, allowing unauthenticated attackers to cause denial-of-service through CPU and memory consumption. This issue can be mitigated by restricting request body size at the reverse proxy or web framework, rate-limiting webhook endpoints, and/or rejecting oversized requests before JSON parsing.

Defensive priority

High-priority patching recommended due to potential for denial-of-service attacks through CPU and memory consumption.

Recommended defensive actions

• Apply patch version 3.0.7 or later
• Restrict request body size at the reverse proxy or web framework
• Rate-limit webhook endpoints
• Reject oversized requests before JSON parsing
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• 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

Evidence from the NVD and GitHub indicates that aiosend versions prior to 3.0.7 are vulnerable to a denial-of-service attack. The issue is caused by the deserialization of the entire request body before verifying the HMAC signature in the `WebhookHandler.feed_update()` method.

Official resources