urllib3 is an HTTP client library for Python. urllib3's streaming API 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. urllib3 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. Starting in version 1.22 and prior to version 2.6.3, 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. Applications and libraries are affected when they stream content from untrusted sources by setting `preload_content=False` when they do not disable redirects. Users should upgrade to at least urllib3 v2.6.3, in which the library does not decode content of redirect responses when `preload_content=False`. If upgrading is not immediately possible, disable redirects by setting `redirect=False` for requests to untrusted source.
This issue has been addressed in the following products: Red Hat Enterprise Linux 10 Via RHSA-2026:1086 https://access.redhat.com/errata/RHSA-2026:1086
This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2026:1087 https://access.redhat.com/errata/RHSA-2026:1087
This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2026:1089 https://access.redhat.com/errata/RHSA-2026:1089
This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2026:1088 https://access.redhat.com/errata/RHSA-2026:1088
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2026:1224 https://access.redhat.com/errata/RHSA-2026:1224
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2026:1226 https://access.redhat.com/errata/RHSA-2026:1226
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2026:1241 https://access.redhat.com/errata/RHSA-2026:1241
This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2026:1239 https://access.redhat.com/errata/RHSA-2026:1239
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2026:1240 https://access.redhat.com/errata/RHSA-2026:1240
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2026:1254 https://access.redhat.com/errata/RHSA-2026:1254
This issue has been addressed in the following products: RHUI 4 for RHEL 8 Via RHSA-2026:1485 https://access.redhat.com/errata/RHSA-2026:1485
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Via RHSA-2026:1546 https://access.redhat.com/errata/RHSA-2026:1546
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions Via RHSA-2026:1618 https://access.redhat.com/errata/RHSA-2026:1618
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.6 Extended Update Support Via RHSA-2026:1619 https://access.redhat.com/errata/RHSA-2026:1619
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.4 Extended Update Support Via RHSA-2026:1674 https://access.redhat.com/errata/RHSA-2026:1674
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Red Hat Enterprise Linux 8.8 Telecommunications Update Service Via RHSA-2026:1676 https://access.redhat.com/errata/RHSA-2026:1676
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Via RHSA-2026:1693 https://access.redhat.com/errata/RHSA-2026:1693
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.6 Extended Update Support Via RHSA-2026:1704 https://access.redhat.com/errata/RHSA-2026:1704
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.6 Extended Update Support Via RHSA-2026:1706 https://access.redhat.com/errata/RHSA-2026:1706
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.4 Extended Update Support Via RHSA-2026:1712 https://access.redhat.com/errata/RHSA-2026:1712
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.4 Extended Update Support Via RHSA-2026:1717 https://access.redhat.com/errata/RHSA-2026:1717
This issue has been addressed in the following products: Red Hat Enterprise Linux 10.0 Extended Update Support Via RHSA-2026:1726 https://access.redhat.com/errata/RHSA-2026:1726
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.6 Extended Update Support Via RHSA-2026:1729 https://access.redhat.com/errata/RHSA-2026:1729
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions Via RHSA-2026:1734 https://access.redhat.com/errata/RHSA-2026:1734
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Via RHSA-2026:1735 https://access.redhat.com/errata/RHSA-2026:1735