CVE-2026-70646 json
aiosend: Deserialization of request body before signature verification (Pre-auth DoS) in webhook handler
published 2026-05-22 5 mo ago modified 2026-10-23 16 d ago also GHSA-7m8f-hgjq-8gc9 , PYSEC-2026-3626 , EUVD-2026-53920
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 50%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- pypi aiosend 3.0.7
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 3 mo ago
Exploit prediction
0.64% chance of exploitation in the next 30 days, higher than 50% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| OSV | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | aiosend | <3.0.7 |
3.0.7 |
Affected products
- vovchic17 aiosend
Classification
- Weakness
-
- CWE-400 Uncontrolled Resource Consumption
References
-
github.com
/vovchic17/aiosend/commit/db20f0a742209dfac181863d398ec5112687efa4
web
-
github.com
/vovchic17/aiosend/security/advisories/GHSA-7m8f-hgjq-8gc9
web
-
github.com
/vovchic17/aiosend/releases/tag/v3.0.7
web
-
github.com
/vovchic17/aiosend
package
-
pypi.org
/project/aiosend
package
-
github.com
/advisories/GHSA-7m8f-hgjq-8gc9
advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-70646
advisory
Sources
- CVE List CVE-2026-70646
- GitHub Advisory GHSA-7m8f-hgjq-8gc9
- NVD CVE-2026-70646
- OSV PYSEC-2026-3626
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.