Vulnerability · Published Aug 6, 2026 · Assigned by GitHub_M

CVE-2026-70646aiosend: Deserialization of request body before signature verification (Pre-auth DoS) in webhook handler

High 7.5

In plain English

A high-severity uncontrolled resource consumption in aiosend from vovchic17. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 51% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.6%top 49.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

aiosend is a synchronous and asynchronous Crypto Pay API client. Pror to version 3.0.7, `WebhookHandler.feed_update()` deserializes the entire request body before verifying the HMAC signature. This allows an unauthenticated attacker to force expensive parsing of arbitrary JSON payloads that will ultimately be rejected, leading to unnecessary CPU and memory consumption. Version 3.0.7 fixes the issue. Some workarounds are available. Restrict request body size at the reverse proxy or web framework, rate-limit webhook endpoints, and/or reject oversized requests before JSON parsing.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	aiosend	3.0.7	GHSA-7m8f-hgjq-8gc9
PyPI	aiosend	3.0.7	PYSEC-2026-3626

Affected products (as reported)

Vendor	Product	Versions
vovchic17	aiosend	< 3.0.6

Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

https://github.com/vovchic17/aiosend/security/advisories/GHSA-7m8f-hgjq-8gc9 x_refsource_CONFIRM
https://github.com/vovchic17/aiosend/commit/db20f0a742209dfac181863d398ec5112687efa4 x_refsource_MISC
https://github.com/vovchic17/aiosend/releases/tag/v3.0.7 x_refsource_MISC