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CVE-2026-49855

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-49855

Severity

7.5

High

CVSS V3

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Summary

tornado AsyncHTTPClient accumulates decompressed chunks without size limit (gzip bomb)

Description

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.

References

Affected packages

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