CVE-2026-49855
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.6, Tornado gzip decompression routines processed limited-size chunks but did not enforce an overall limit on accumulated decompressed chunks, allowing a malicious server accessed by SimpleAsyncHTTPClient or an HTTPServer configured with decompress_request=True to consume effectively unlimited memory. This issue is fixed in version 6.5.6.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| tornadoweb | tornado | < 6.5.6 | affected |
Weaknesses
- CWE-409: CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)
References
- https://github.com/tornadoweb/tornado/security/advisories/GHSA-mgf9-4vpg-hj56
- https://github.com/tornadoweb/tornado/pull/3626
- https://github.com/tornadoweb/tornado/commit/ff808b33adc52d89a549376a5e3628e92abbc8ff
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