Denial of service when trying to parse malformed POST requests in aiohttp (aio-libs aiohttp)
At a glance
- Source
- NVD
- EPSS
- EPSS 1.09 % · percentile 65 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- GitHub_M
- NVD status
- Modified
Description
aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. In affected versions an attacker can send a specially crafted POST (multipart/form-data) request. When the aiohttp server processes it, the server will enter an infinite loop and be unable to process any further requests. An attacker can stop the application from serving requests after sending a single request. This issue has been addressed in version 3.9.4. Users are advised to upgrade. Users unable to upgrade may manually apply a patch to their systems. Please see the linked GHSA for instructions.
Weaknesses (CWE)
- CWE-835 — Loop with Unreachable Exit Condition
References
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-5m98-qgg9-wh84
- https://github.com/aio-libs/aiohttp/commit/7eecdff163ccf029fbb1ddc9de4169d4aaeb6597
- https://github.com/aio-libs/aiohttp/commit/cebe526b9c34dc3a3da9140409db63014bc4cf19
- https://github.com/aio-libs/aiohttp/commit/f21c6f2ca512a026ce7f0f6c6311f62d6a638866
- http://www.openwall.com/lists/oss-security/2024/05/02/4
- https://lists.debian.org/debian-lts-announce/2025/02/msg00002.html
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | GitHub_M |
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | NVD · security-advisories@github.com (Secondary) |
Advisories
- GHSA-5m98-qgg9-wh84 — aiohttp vulnerable to Denial of Service when trying to parse malformed POST requests
- PYSEC-2026-1098 — aiohttp vulnerable to Denial of Service when trying to parse malformed POST requests
European references
- ENISA EUVD · EUVD-2024-1442
- GCVE · GCVE-0-2024-30251
CERT-FR advisories
- CERTFR-2026-AVI-0627 — Multiples vulnérabilités dans les produits Splunk · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0538 — Multiples vulnérabilités dans VMware Tanzu · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0514 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:aiohttp:aiohttp:*:*:*:*:*:*:*:*< 3.9.4
Affected products
| Product | Versions |
|---|---|
| aio-libs · aiohttp | affected < 3.9.4 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |