Improper Handling of Highly Compressed Data (Data Amplification) Affecting mitmproxy package, versions <12.2.3-r1


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.57% (44th percentile)

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  • Snyk IDSNYK-WOLFILATEST-MITMPROXY-17670828
  • published29 Jun 2026
  • disclosed14 Jul 2026

Introduced: 29 Jun 2026

CVE-2026-49855  (opens in a new tab)
CWE-409  (opens in a new tab)

How to fix?

Upgrade Wolfi mitmproxy to version 12.2.3-r1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream mitmproxy package and not the mitmproxy package as distributed by Wolfi. See How to fix? for Wolfi relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1