AIOHTTP has unicode match groups in regexes for ASCII protocol elements
### Summary The parser allows non-ASCII decimals to be present in the Range header. ### Impact There is no known impact, but there is the possibility that there's a method to exploit a request smuggling vulnerability. ---- Patch: https://github.com/aio-libs/aiohttp/commit/c7b7a044f88c71cefda95ec75cdcfaa4792b3b96
02 / AFFECTED SOFTWARE
Affected packages
150 explicit affected versions
303 explicit affected versions
303 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
### Summary The parser allows non-ASCII decimals to be present in the Range header. ### Impact There is no known impact, but there is the possibility that there's a method to exploit a request smuggling vulnerability. ---- Patch: https://github.com/aio-libs/aiohttp/commit/c7b7a044f88c71cefda95ec75cdcfaa4792b3b96
### Summary The parser allows non-ASCII decimals to be present in the Range header. ### Impact There is no known impact, but there is the possibility that there's a method to exploit a request smuggling vulnerability. ---- Patch: https://github.com/aio-libs/aiohttp/commit/c7b7a044f88c71cefda95ec75cdcfaa4792b3b96
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below contain parser logic which allows non-ASCII decimals to be present in the Range header. There is no known impact, but there is the possibility that there's a method to exploit a request smuggling vulnerability. This issue is fixed in version 3.13.3.
05 / REFERENCES
Further evidence
- https://github.com/aio-libs/aiohttp
- https://github.com/aio-libs/aiohttp/commit/c7b7a044f88c71cefda95ec75cdcfaa4792b3b96
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-mqqc-3gqh-h2x8
- https://nvd.nist.gov/vuln/detail/CVE-2025-69225
- https://github.com/advisories/GHSA-mqqc-3gqh-h2x8
- https://pypi.org/project/aiohttp
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/69xxx/CVE-2025-69225.json