{"url":"http://public2.vulnerablecode.io/api/packages/61680?format=json","purl":"pkg:pypi/urllib3@2.6.3","type":"pypi","namespace":"","name":"urllib3","version":"2.6.3","qualifiers":{},"subpath":"","is_vulnerable":false,"next_non_vulnerable_version":null,"latest_non_vulnerable_version":null,"affected_by_vulnerabilities":[],"fixing_vulnerabilities":[{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/20200?format=json","vulnerability_id":"VCID-kjka-a931-uygj","summary":"Decompression-bomb safeguards bypassed when following HTTP redirects (streaming API)\n### Impact\n\nurllib3's [streaming API](https://urllib3.readthedocs.io/en/2.6.2/advanced-usage.html#streaming-and-i-o) is designed for the efficient handling of large HTTP responses by reading the content in chunks, rather than loading the entire response body into memory at once.\n\nurllib3 can perform decoding or decompression based on the HTTP `Content-Encoding` header (e.g., `gzip`, `deflate`, `br`, or `zstd`). When using the streaming API, the library decompresses only the necessary bytes, enabling partial content consumption.\n\nHowever, for HTTP redirect responses, the library would read the entire response body to drain the connection and decompress the content unnecessarily. This decompression occurred even before any read methods were called, and configured read limits did not restrict the amount of decompressed data. As a result, there was no safeguard against decompression bombs. A malicious server could exploit this to trigger excessive resource consumption on the client (high CPU usage and large memory allocations for decompressed data; CWE-409).\n\n### Affected usages\n\nApplications and libraries using urllib3 version 2.6.2 and earlier to stream content from untrusted sources by setting `preload_content=False` when they do not disable redirects.\n\n\n### Remediation\n\nUpgrade to at least urllib3 v2.6.3 in which the library does not decode content of redirect responses when `preload_content=False`.\n\nIf upgrading is not immediately possible, disable [redirects](https://urllib3.readthedocs.io/en/2.6.2/user-guide.html#retrying-requests) by setting `redirect=False` for requests to untrusted 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