urllib3: urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects (streaming API)

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...

CVE-2026-9375

urllib3 version 2.6.3 is vulnerable to a decompression bomb bypass in its streaming API preloadcontent=False when using Brotli support. The issue arises due to three independent code paths in response.py that bypass the maxlength protection introduced in version 2.6.0 to mitigate CVE-2025-66471...

CVE-2026-9375 Decompression Bomb Bypass via Negative max_length in Streaming API in urllib3

urllib3 version 2.6.3 is vulnerable to a decompression bomb bypass in its streaming API preloadcontent=False when using Brotli support. The issue arises due to three independent code paths in response.py that bypass the maxlength protection introduced in version 2.6.0 to mitigate CVE-2025-66471...

CVE-2026-9375

urllib3 2.6.3 is vulnerable to a decompression bomb bypass in its streaming API when Brotli is enabled and preload_content is False. Three code paths in response.py bypass the max_length protection added in 2.6.0 to mitigate CVE-2025-66471: (1) negative max_length can result from buffer arithmeti...

CVE-2026-48138

There is an out-of-bounds read vulnerability in the NI grpc-device streaming API due to a missing bounds check that may result in a denial of service. Successful exploitation requires an attacker to supply a specially crafted write request. This affects NI grpc-device 2.17.0 and prior versions...

CVE-2026-48138 Out-of-bounds read vulnerability in the NI grpc-device streaming API

There is an out-of-bounds read vulnerability in the NI grpc-device streaming API due to a missing bounds check that may result in a denial of service. Successful exploitation requires an attacker to supply a specially crafted write request. This affects NI grpc-device 2.17.0 and prior versions...

PT-2026-51014

Name of the Vulnerable Software and Affected Versions urllib3 version 2.6.3 Brotli version 1.2.0 Description A decompression bomb bypass exists in the streaming API preload content=False when Brotli support is used. This occurs because three independent code paths in response.py bypass the max...

CVE-2026-44432 urllib3: Decompression-bomb safeguards bypassed in parts of the streaming API

urllib3 is an HTTP client library for Python. From 2.6.0 to before 2.7.0, urllib3 could decompress the whole response instead of the requested portion 1 during the second HTTPResponse.readamt=N call when the response was decompressed using the official Brotli library or 2 when...

GHSA-MF9V-MFXR-J63J urllib3: Decompression-bomb safeguards bypassed in parts of the streaming API

Impact 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 decompression based on the HTTP Content-Encoding header e.g., gzip, deflate, br, or...

urllib3: Decompression-bomb safeguards bypassed in parts of the streaming API

Impact 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 decompression based on the HTTP Content-Encoding header e.g., gzip, deflate, br, or...

RHEL 6 : python-urllib3 (RHSA-2026:11722)

The remote Redhat Enterprise Linux 6 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2026:11722 advisory. Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic da...

Important: Red Hat Security Advisory: python-urllib3 security update

An update for python-urllib3 is now available for Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity...

Important: Red Hat Security Advisory: python-urllib3 security update

An update for python-urllib3 is now available for Red Hat Enterprise Linux 7 Extended Lifecycle Support. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is...

RHEL 7 : python-urllib3 (RHSA-2026:9031)

The remote Redhat Enterprise Linux 7 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2026:9031 advisory. Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic dat...

MiracleLinux 8 : resource-agents-4.9.0-54.el8_10.27 (AXSA:2026-456:03)

The remote MiracleLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2026-456:03 advisory. urllib3: urllib3: Unbounded decompression chain leads to resource exhaustion CVE-2025-66418 urllib3: urllib3 Streaming API improperly handles highly...

SUSE SLES12 Security Update : python-urllib3 (SUSE-SU-2026:1412-1)

The remote SUSE Linux SLES12 / SLESSAP12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:1412-1 advisory. Security issues: - CVE-2025-66418: resource exhaustion via unbounded number of links in the decompression chain bsc1254866. -...

AlmaLinux 8 : fence-agents (ALSA-2026:1240)

The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:1240 advisory. urllib3: urllib3: Unbounded decompression chain leads to resource exhaustion CVE-2025-66418 urllib3: urllib3 Streaming API improperly handles highly...

RHEL 8 : fence-agents (RHSA-2026:1240)

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:1240 advisory. The fence-agents packages provide a collection of scripts for handling remote power management for cluster devices. They allow failed or...

AlmaLinux 8 : resource-agents (ALSA-2026:1241)

The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:1241 advisory. urllib3: urllib3: Unbounded decompression chain leads to resource exhaustion CVE-2025-66418 urllib3: urllib3 Streaming API improperly handles highly...

SUSE SLED15 / SLES15 Security Update : python-urllib3 (SUSE-SU-2026:1067-1)

The remote SUSE Linux SLED15 / SLEDSAP15 / SLES15 / SLESSAP15 host has a package installed that is affected by a vulnerability as referenced in the SUSE-SU-2026:1067-1 advisory. This update for python-urllib3 fixes the following issue: - CVE-2025-66471: excessive resource consumption via...