Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.0, attacker-controlled input included into multipart/payload headers can be used to modify a request to inject additional headers or similar. In the unlikely situation that an application is passing user-controlled strings into MultipartWriter.append(headers=...) or Payload.headers, then an attacker may be able to modify the request to inject headers or change the contents of the request. This vulnerability is fixed in 3.14.0.
Severity (CVSS)
| Base score | 2.7 |
|---|---|
| Severity | Low |
| Version | CVSS 4.0 |
| Vector | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U |
| Provided by | CNA |
Weaknesses
- CWE-93 — CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')
- CWE-113 — CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
Affected products
| Vendor | Product | Versions |
|---|---|---|
| aio-libs | aiohttp | < 3.14.0 |
References
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-m6qw-4cw2-hm4m (x_refsource_CONFIRM)
- https://github.com/aio-libs/aiohttp/commit/bf88077ebb14f4c29924b8e8904cba20c55c28b8 (x_refsource_MISC)
Generated from the official CVE List on 23 Jun 2026 10:05 UTC.