VDB
RHSA-2026%3A1176
RHSA-2026%3A1176
PUBLISHED
CVSS 7.5 HIGH
A flaw was found in urllib3 Python library that could lead to a Denial of Service condition. A remote, malicious server can exploit this flaw by responding to a client request with an HTTP message that uses an excessive number of chained compression algorithms. This unlimited decompression chain causes the client system to consume a virtually unbounded amount of CPU resources and memory. The high resource usage leads to service disruption, making the application unresponsive.
Risk Scores
CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | registry.redhat.io/cert-manager/cert-manager-operator-rhel9@sha256:22f4e686a81fc809e70e3f73206ec221f8081e842243f173308dc1fbc7f02a3e_arm64 as a component of cert-manager operator for Red Hat OpenShift 1.18 | registry.redhat.io/cert-manager/cert-manager-operator-rhel9@sha256:22f4e686a81fc809e70e3f73206ec221f8081e842243f173308dc1fbc7f02a3e_arm64, *, * |
| Red Hat | registry.redhat.io/cert-manager/cert-manager-operator-rhel9@sha256:224213f66e8654228eb5aacdecef18207aeebea9314f086194f8c9ca3904a8a9_s390x as a component of cert-manager operator for Red Hat OpenShift 1.18 | registry.redhat.io/cert-manager/cert-manager-operator-rhel9@sha256:224213f66e8654228eb5aacdecef18207aeebea9314f086194f8c9ca3904a8a9_s390x, registry.redhat.io/cert-manager/cert-manager-operator-rhel9@sha256:224213f66e8654228eb5aacdecef18207aeebea9314f086194f8c9ca3904a8a9_s390x, registry.redhat.io/cert-manager/cert-manager-operator-rhel9@sha256:224213f66e8654228eb5aacdecef18207aeebea9314f086194f8c9ca3904a8a9_s390x |
| Red Hat | registry.redhat.io/cert-manager/cert-manager-operator-rhel9@sha256:224213f66e8654228eb5aacdecef18207aeebea9314f086194f8c9ca3904a8a9_s390x as a component of cert-manager operator for Red Hat OpenShift 1.18 | *, *, * |
| urllib3 | urllib3 | |
| Red Hat | registry.redhat.io/cert-manager/cert-manager-operator-rhel9@sha256:57a1aea49d7cc275b37b8f52d602a3a9d1601ec6a21a3268dd4903566cb2e335_amd64 as a component of cert-manager operator for Red Hat OpenShift 1.18 | registry.redhat.io/cert-manager/cert-manager-operator-rhel9@sha256:57a1aea49d7cc275b37b8f52d602a3a9d1601ec6a21a3268dd4903566cb2e335_amd64, registry.redhat.io/cert-manager/cert-manager-operator-rhel9@sha256:57a1aea49d7cc275b37b8f52d602a3a9d1601ec6a21a3268dd4903566cb2e335_amd64, registry.redhat.io/cert-manager/cert-manager-operator-rhel9@sha256:57a1aea49d7cc275b37b8f52d602a3a9d1601ec6a21a3268dd4903566cb2e335_amd64 |
| Red Hat | registry.redhat.io/cert-manager/cert-manager-operator-rhel9@sha256:57a1aea49d7cc275b37b8f52d602a3a9d1601ec6a21a3268dd4903566cb2e335_amd64 as a component of cert-manager operator for Red Hat OpenShift 1.18 | registry.redhat.io/cert-manager/cert-manager-operator-rhel9@sha256:57a1aea49d7cc275b37b8f52d602a3a9d1601ec6a21a3268dd4903566cb2e335_amd64, *, registry.redhat.io/cert-manager/cert-manager-operator-rhel9@sha256:57a1aea49d7cc275b37b8f52d602a3a9d1601ec6a21a3268dd4903566cb2e335_amd64 |
| Red Hat | registry.redhat.io/cert-manager/cert-manager-operator-rhel9@sha256:52e79d441ddb1d1de081220f3e71cd316d09a9eb7cccc80944be29ac4a84e187_ppc64le as a component of cert-manager operator for Red Hat OpenShift 1.18 | *, registry.redhat.io/cert-manager/cert-manager-operator-rhel9@sha256:52e79d441ddb1d1de081220f3e71cd316d09a9eb7cccc80944be29ac4a84e187_ppc64le, registry.redhat.io/cert-manager/cert-manager-operator-rhel9@sha256:52e79d441ddb1d1de081220f3e71cd316d09a9eb7cccc80944be29ac4a84e187_ppc64le |
| Red Hat | registry.redhat.io/cert-manager/cert-manager-operator-rhel9@sha256:52e79d441ddb1d1de081220f3e71cd316d09a9eb7cccc80944be29ac4a84e187_ppc64le as a component of cert-manager operator for Red Hat OpenShift 1.18 | *, *, * |
| Red Hat | registry.redhat.io/cert-manager/cert-manager-operator-rhel9@sha256:22f4e686a81fc809e70e3f73206ec221f8081e842243f173308dc1fbc7f02a3e_arm64 as a component of cert-manager operator for Red Hat OpenShift 1.18 | registry.redhat.io/cert-manager/cert-manager-operator-rhel9@sha256:22f4e686a81fc809e70e3f73206ec221f8081e842243f173308dc1fbc7f02a3e_arm64, registry.redhat.io/cert-manager/cert-manager-operator-rhel9@sha256:22f4e686a81fc809e70e3f73206ec221f8081e842243f173308dc1fbc7f02a3e_arm64, * |
Timeline
- Jan 26, 2026 CVE Published
- Apr 24, 2026 Distribution Patch
- Apr 24, 2026 Distribution Patch
- Apr 24, 2026 Security Advisory
- Apr 24, 2026 Security Advisory
- Apr 24, 2026 Security Advisory
- Apr 24, 2026 Security Advisory
- Jul 7, 2026 CVE Updated
References
- https://access.redhat.com/errata/RHSA-2026:1176 advisory
- https://access.redhat.com/security/cve/CVE-2025-66418 advisory
- https://access.redhat.com/security/cve/CVE-2025-66471 advisory
- https://access.redhat.com/security/cve/CVE-2026-21441 advisory
- https://access.redhat.com/security/updates/classification/ advisory
- https://docs.openshift.com/container-platform/latest/security/cert_manager_operator/index.html advisory
- https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_1176.json advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2419455 issue
- https://www.cve.org/CVERecord?id=CVE-2025-66418 advisory
- https://nvd.nist.gov/vuln/detail/CVE-2025-66418 advisory
- https://github.com/urllib3/urllib3/commit/24d7b67eac89f94e11003424bcf0d8f7b72222a8 advisory
- https://github.com/urllib3/urllib3/security/advisories/GHSA-gm62-xv2j-4w53 advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2419467 issue
- https://www.cve.org/CVERecord?id=CVE-2025-66471 advisory
- https://nvd.nist.gov/vuln/detail/CVE-2025-66471 advisory
- https://github.com/urllib3/urllib3/commit/c19571de34c47de3a766541b041637ba5f716ed7 advisory
- https://github.com/urllib3/urllib3/security/advisories/GHSA-2xpw-w6gg-jr37 advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2427726 issue
- https://www.cve.org/CVERecord?id=CVE-2026-21441 advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-21441 advisory
…and 2 more