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[ CVE-2026-61541 · Published 21 Sep 2026 ]

Zapros has an Unbounded Content-Encoding decompression chain that allows denial of service

CVSS 6.9 EPSS <1%Fix available

[ Description ]Official description

Zapros, a Python HTTP client, prior to version 0.14.0 is vulnerable to denial of service when an application requests content from an untrusted server, or follows a redirect to one, because a malicious response containing an excessive number of chained `Content-Encoding` values causes Zapros to construct a deeply nested decompression chain that consumes excessive resources. Version 0.14.0 patches the vulnerability by limiting responses to five content-encoding layers and raising `DecodingError` when that limit is exceeded. As a workaround, applications can add response middleware that inspects the `Content-Encoding` header and rejects responses containing more than a safe number of encoding layers.

[ Fixes ]Fixes and patches

  • zapros 0.14.0Fixed version · GitHub Advisories · pip package zapros: upgrade to 0.14.0 or later (affected < 0.14.0)

[ Packages ]Affected open-source packages

[ References ]References