RHSA-2026:0990

Vulnerability from csaf_redhat - Published: 2026-01-22 11:34 - Updated: 2026-03-26 05:15
Summary
Red Hat Security Advisory: cert-manager Operator for Red Hat OpenShift 1.18.1
Severity
Important
Notes
Topic: cert-manager Operator for Red Hat OpenShift 1.18.1
Details: The cert-manager Operator for Red Hat OpenShift builds on top of Kubernetes, introducing certificate authorities and certificates as first-class resource types in the Kubernetes API. This makes it possible to provide certificates-as-a-service to developers working within your Kubernetes cluster.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
CVE-2025-61727

A flaw was found in the crypto/x509 package in the Go standard library. This vulnerability allows a certificate validation bypass via an excluded subdomain constraint in a certificated chain as it does not restrict the usage of wildcard SANs in the leaf certificate.

6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CWE-295 - Improper Certificate Validation
Vendor Fix Before applying this update, make sure all previously released errata relevant to your system have been applied. The steps to apply the upgraded images are different depending on the installation plan approval policy you used when installing the cert-manager Operator for Red Hat OpenShift. - If the approval policy is set to `Automatic`, then the Operator will be upgraded automatically when there is a new version of the Operator. No further action is required to upgrade. This is the default setting. - If you changed the approval policy to `Manual`, then you must manually approve the upgrade to the Operator. See https://docs.openshift.com/container-platform/latest/security/cert_manager_operator/index.html for additional information. https://access.redhat.com/errata/RHSA-2026:0990
Workaround Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
CVE-2025-61729

A flaw was found in golang. A remote attacker could exploit this vulnerability by providing a specially crafted certificate during the error string construction process within the `HostnameError.Error()` function. This flaw, caused by unbounded string concatenation, leads to excessive resource consumption. Successful exploitation can result in a denial of service (DoS) for the affected system.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-1050 - Excessive Platform Resource Consumption within a Loop
Vendor Fix Before applying this update, make sure all previously released errata relevant to your system have been applied. The steps to apply the upgraded images are different depending on the installation plan approval policy you used when installing the cert-manager Operator for Red Hat OpenShift. - If the approval policy is set to `Automatic`, then the Operator will be upgraded automatically when there is a new version of the Operator. No further action is required to upgrade. This is the default setting. - If you changed the approval policy to `Manual`, then you must manually approve the upgrade to the Operator. See https://docs.openshift.com/container-platform/latest/security/cert_manager_operator/index.html for additional information. https://access.redhat.com/errata/RHSA-2026:0990
CVE-2025-66418

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.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-770 - Allocation of Resources Without Limits or Throttling
Vendor Fix Before applying this update, make sure all previously released errata relevant to your system have been applied. The steps to apply the upgraded images are different depending on the installation plan approval policy you used when installing the cert-manager Operator for Red Hat OpenShift. - If the approval policy is set to `Automatic`, then the Operator will be upgraded automatically when there is a new version of the Operator. No further action is required to upgrade. This is the default setting. - If you changed the approval policy to `Manual`, then you must manually approve the upgrade to the Operator. See https://docs.openshift.com/container-platform/latest/security/cert_manager_operator/index.html for additional information. https://access.redhat.com/errata/RHSA-2026:0990
CVE-2025-66471

A decompression handling flaw has been discovered in urllib3. When streaming a compressed response, urllib3 can perform decoding or decompression based on the HTTP Content-Encoding header (e.g., gzip, deflate, br, or zstd). The library must read compressed data from the network and decompress it until the requested chunk size is met. Any resulting decompressed data that exceeds the requested amount is held in an internal buffer for the next read operation. The decompression logic could cause urllib3 to fully decode a small amount of highly compressed data in a single operation. This can result in excessive resource consumption (high CPU usage and massive memory allocation for the decompressed data; CWE-409) on the client side, even if the application only requested a small chunk of data.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Vendor Fix Before applying this update, make sure all previously released errata relevant to your system have been applied. The steps to apply the upgraded images are different depending on the installation plan approval policy you used when installing the cert-manager Operator for Red Hat OpenShift. - If the approval policy is set to `Automatic`, then the Operator will be upgraded automatically when there is a new version of the Operator. No further action is required to upgrade. This is the default setting. - If you changed the approval policy to `Manual`, then you must manually approve the upgrade to the Operator. See https://docs.openshift.com/container-platform/latest/security/cert_manager_operator/index.html for additional information. https://access.redhat.com/errata/RHSA-2026:0990
Workaround Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
CVE-2026-21441

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.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Vendor Fix Before applying this update, make sure all previously released errata relevant to your system have been applied. The steps to apply the upgraded images are different depending on the installation plan approval policy you used when installing the cert-manager Operator for Red Hat OpenShift. - If the approval policy is set to `Automatic`, then the Operator will be upgraded automatically when there is a new version of the Operator. No further action is required to upgrade. This is the default setting. - If you changed the approval policy to `Manual`, then you must manually approve the upgrade to the Operator. See https://docs.openshift.com/container-platform/latest/security/cert_manager_operator/index.html for additional information. https://access.redhat.com/errata/RHSA-2026:0990
References
https://access.redhat.com/errata/RHSA-2026:0990 self
https://access.redhat.com/security/cve/CVE-2025-61727 external
https://access.redhat.com/security/cve/CVE-2025-61729 external
https://access.redhat.com/security/cve/CVE-2025-66418 external
https://access.redhat.com/security/cve/CVE-2025-66471 external
https://access.redhat.com/security/cve/CVE-2026-21441 external
https://access.redhat.com/security/updates/classi… external
https://docs.openshift.com/container-platform/lat… external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2025-61727 self
https://bugzilla.redhat.com/show_bug.cgi?id=2418677 external
https://www.cve.org/CVERecord?id=CVE-2025-61727 external
https://nvd.nist.gov/vuln/detail/CVE-2025-61727 external
https://go.dev/cl/723900 external
https://go.dev/issue/76442 external
https://groups.google.com/g/golang-announce/c/8FJ… external
https://pkg.go.dev/vuln/GO-2025-4175 external
https://access.redhat.com/security/cve/CVE-2025-61729 self
https://bugzilla.redhat.com/show_bug.cgi?id=2418462 external
https://www.cve.org/CVERecord?id=CVE-2025-61729 external
https://nvd.nist.gov/vuln/detail/CVE-2025-61729 external
https://go.dev/cl/725920 external
https://go.dev/issue/76445 external
https://pkg.go.dev/vuln/GO-2025-4155 external
https://access.redhat.com/security/cve/CVE-2025-66418 self
https://bugzilla.redhat.com/show_bug.cgi?id=2419455 external
https://www.cve.org/CVERecord?id=CVE-2025-66418 external
https://nvd.nist.gov/vuln/detail/CVE-2025-66418 external
https://github.com/urllib3/urllib3/commit/24d7b67… external
https://github.com/urllib3/urllib3/security/advis… external
https://access.redhat.com/security/cve/CVE-2025-66471 self
https://bugzilla.redhat.com/show_bug.cgi?id=2419467 external
https://www.cve.org/CVERecord?id=CVE-2025-66471 external
https://nvd.nist.gov/vuln/detail/CVE-2025-66471 external
https://github.com/urllib3/urllib3/commit/c19571d… external
https://github.com/urllib3/urllib3/security/advis… external
https://access.redhat.com/security/cve/CVE-2026-21441 self
https://bugzilla.redhat.com/show_bug.cgi?id=2427726 external
https://www.cve.org/CVERecord?id=CVE-2026-21441 external
https://nvd.nist.gov/vuln/detail/CVE-2026-21441 external
https://github.com/urllib3/urllib3/commit/8864ac4… external
https://github.com/urllib3/urllib3/security/advis… external
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    {
      "cve": "CVE-2025-61727",
      "cwe": {
        "id": "CWE-295",
        "name": "Improper Certificate Validation"
      },
      "discovery_date": "2025-12-03T20:01:21.730501+00:00",
      "flags": [
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            "cert-manager operator for Red Hat OpenShift 1.18:registry.redhat.io/cert-manager/jetstack-cert-manager-acmesolver-rhel9@sha256:41f1f7807a760ba804e71971810977dc63010a17ccd74b607aaf01fb28386cbc_s390x",
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      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2418677"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the crypto/x509 package in the Go standard library. This vulnerability allows a certificate validation bypass via an excluded subdomain constraint in a certificated chain as it does not restrict the usage of wildcard SANs in the leaf certificate.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "golang: crypto/x509: excluded subdomain constraint does not restrict wildcard SANs",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "To exploit this issue, an attacker needs to obtain a leaf certificate with a wildcard SAN (e.g., *.example.com) and the legitimate certificate policy must contain an excluded DNS name constraint (e.g., to prevent issuance for test.example.com), allowing an application using the crypto/x509 package to validate the certificate when it should have been rejected and to be vulnerable to MITM (man-in-the-middle) attacks. Additionally, the attacker does not have full control of what data can be read of modified during the attack. Due to these reasons, this flaw has been rated with a moderate severity.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2025-61727"
        },
        {
          "category": "external",
          "summary": "RHBZ#2418677",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2418677"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2025-61727",
          "url": "https://www.cve.org/CVERecord?id=CVE-2025-61727"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-61727",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-61727"
        },
        {
          "category": "external",
          "summary": "https://go.dev/cl/723900",
          "url": "https://go.dev/cl/723900"
        },
        {
          "category": "external",
          "summary": "https://go.dev/issue/76442",
          "url": "https://go.dev/issue/76442"
        },
        {
          "category": "external",
          "summary": "https://groups.google.com/g/golang-announce/c/8FJoBkPddm4",
          "url": "https://groups.google.com/g/golang-announce/c/8FJoBkPddm4"
        },
        {
          "category": "external",
          "summary": "https://pkg.go.dev/vuln/GO-2025-4175",
          "url": "https://pkg.go.dev/vuln/GO-2025-4175"
        }
      ],
      "release_date": "2025-12-03T19:37:15.054000+00:00",
      "remediations": [
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          "category": "vendor_fix",
          "date": "2026-01-22T11:34:41+00:00",
          "details": "Before applying this update, make sure all previously released errata relevant to your system have been applied.\n\nThe steps to apply the upgraded images are different depending on the installation plan approval policy you used\nwhen installing the cert-manager Operator for Red Hat OpenShift.\n\n- If the approval policy is set to `Automatic`, then the Operator will be upgraded automatically when there is a\nnew version of the Operator. No further action is required to upgrade. This is the default setting.\n\n- If you changed the approval policy to `Manual`, then you must manually approve the upgrade to the Operator.\n\nSee https://docs.openshift.com/container-platform/latest/security/cert_manager_operator/index.html for additional\ninformation.",
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            "category": "none"
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          "url": "https://access.redhat.com/errata/RHSA-2026:0990"
        },
        {
          "category": "workaround",
          "details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.",
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            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
          },
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    },
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        {
          "category": "description",
          "text": "A flaw was found in golang. A remote attacker could exploit this vulnerability by providing a specially crafted certificate during the error string construction process within the `HostnameError.Error()` function. This flaw, caused by unbounded string concatenation, leads to excessive resource consumption. Successful exploitation can result in a denial of service (DoS) for the affected system.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "crypto/x509: golang: Denial of Service due to excessive resource consumption via crafted certificate",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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          "category": "self",
          "summary": "Canonical URL",
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        },
        {
          "category": "external",
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          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2418462"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2025-61729",
          "url": "https://www.cve.org/CVERecord?id=CVE-2025-61729"
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        {
          "category": "external",
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          "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-61729"
        },
        {
          "category": "external",
          "summary": "https://go.dev/cl/725920",
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        {
          "category": "external",
          "summary": "https://groups.google.com/g/golang-announce/c/8FJoBkPddm4",
          "url": "https://groups.google.com/g/golang-announce/c/8FJoBkPddm4"
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          "category": "external",
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          "url": "https://pkg.go.dev/vuln/GO-2025-4155"
        }
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          ],
          "restart_required": {
            "category": "none"
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      "scores": [
        {
          "cvss_v3": {
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            "attackVector": "NETWORK",
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            "baseScore": 7.5,
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            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
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      "title": "crypto/x509: golang: Denial of Service due to excessive resource consumption via crafted certificate"
    },
    {
      "cve": "CVE-2025-66418",
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        "id": "CWE-770",
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          "category": "description",
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          "title": "Vulnerability description"
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          "title": "Vulnerability summary"
        },
        {
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          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
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          "category": "external",
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    },
    {
      "cve": "CVE-2025-66471",
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        "id": "CWE-409",
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        {
          "category": "description",
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          "title": "Vulnerability description"
        },
        {
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          "text": "urllib3: urllib3 Streaming API improperly handles highly compressed data",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
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          "cert-manager operator for Red Hat OpenShift 1.18:registry.redhat.io/cert-manager/jetstack-cert-manager-acmesolver-rhel9@sha256:41f1f7807a760ba804e71971810977dc63010a17ccd74b607aaf01fb28386cbc_s390x",
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        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2025-66471"
        },
        {
          "category": "external",
          "summary": "RHBZ#2419467",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2419467"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2025-66471",
          "url": "https://www.cve.org/CVERecord?id=CVE-2025-66471"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-66471",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-66471"
        },
        {
          "category": "external",
          "summary": "https://github.com/urllib3/urllib3/commit/c19571de34c47de3a766541b041637ba5f716ed7",
          "url": "https://github.com/urllib3/urllib3/commit/c19571de34c47de3a766541b041637ba5f716ed7"
        },
        {
          "category": "external",
          "summary": "https://github.com/urllib3/urllib3/security/advisories/GHSA-2xpw-w6gg-jr37",
          "url": "https://github.com/urllib3/urllib3/security/advisories/GHSA-2xpw-w6gg-jr37"
        }
      ],
      "release_date": "2025-12-05T16:06:08.531000+00:00",
      "remediations": [
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          "category": "vendor_fix",
          "date": "2026-01-22T11:34:41+00:00",
          "details": "Before applying this update, make sure all previously released errata relevant to your system have been applied.\n\nThe steps to apply the upgraded images are different depending on the installation plan approval policy you used\nwhen installing the cert-manager Operator for Red Hat OpenShift.\n\n- If the approval policy is set to `Automatic`, then the Operator will be upgraded automatically when there is a\nnew version of the Operator. No further action is required to upgrade. This is the default setting.\n\n- If you changed the approval policy to `Manual`, then you must manually approve the upgrade to the Operator.\n\nSee https://docs.openshift.com/container-platform/latest/security/cert_manager_operator/index.html for additional\ninformation.",
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            "cert-manager operator for Red Hat OpenShift 1.18:registry.redhat.io/cert-manager/jetstack-cert-manager-rhel9@sha256:28b8e7c5383ce99ef0589242494e9cbb30d0ef94ee16a54c191ab0b434128923_arm64",
            "cert-manager operator for Red Hat OpenShift 1.18:registry.redhat.io/cert-manager/jetstack-cert-manager-rhel9@sha256:3ca7fb070c05efc25fe53af6fc922875ecb9d11943d3c243b2840d7ca2b1aa33_amd64",
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          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:0990"
        },
        {
          "category": "workaround",
          "details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.",
          "product_ids": [
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            "cert-manager operator for Red Hat OpenShift 1.18:registry.redhat.io/cert-manager/jetstack-cert-manager-rhel9@sha256:1f62aebd5bbdd5809116b4575adfec3d51c24e48ce188aaf3b06dd26826bc737_s390x",
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            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
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            "cert-manager operator for Red Hat OpenShift 1.18:registry.redhat.io/cert-manager/jetstack-cert-manager-acmesolver-rhel9@sha256:399c99087dd8b4b6f790dddaa6cd284a1aa459eb641c5b788e1b926e9d0f6a7e_amd64",
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            "cert-manager operator for Red Hat OpenShift 1.18:registry.redhat.io/cert-manager/jetstack-cert-manager-rhel9@sha256:28b8e7c5383ce99ef0589242494e9cbb30d0ef94ee16a54c191ab0b434128923_arm64",
            "cert-manager operator for Red Hat OpenShift 1.18:registry.redhat.io/cert-manager/jetstack-cert-manager-rhel9@sha256:3ca7fb070c05efc25fe53af6fc922875ecb9d11943d3c243b2840d7ca2b1aa33_amd64",
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "urllib3: urllib3 Streaming API improperly handles highly compressed data"
    },
    {
      "cve": "CVE-2026-21441",
      "cwe": {
        "id": "CWE-409",
        "name": "Improper Handling of Highly Compressed Data (Data Amplification)"
      },
      "discovery_date": "2026-01-07T23:01:59.422078+00:00",
      "flags": [
        {
          "label": "vulnerable_code_not_present",
          "product_ids": [
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      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2427726"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "urllib3 is an HTTP client library for Python. urllib3\u0027s 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.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "urllib3: urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects (streaming API)",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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          "cert-manager operator for Red Hat OpenShift 1.18:registry.redhat.io/cert-manager/jetstack-cert-manager-acmesolver-rhel9@sha256:399c99087dd8b4b6f790dddaa6cd284a1aa459eb641c5b788e1b926e9d0f6a7e_amd64",
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          "cert-manager operator for Red Hat OpenShift 1.18:registry.redhat.io/cert-manager/jetstack-cert-manager-acmesolver-rhel9@sha256:cbfb1c86b988a242eb25774b3f1f32d1f29795335c6e4e49f6b3b0065c5af459_arm64"
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-21441"
        },
        {
          "category": "external",
          "summary": "RHBZ#2427726",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2427726"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-21441",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-21441"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-21441",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-21441"
        },
        {
          "category": "external",
          "summary": "https://github.com/urllib3/urllib3/commit/8864ac407bba8607950025e0979c4c69bc7abc7b",
          "url": "https://github.com/urllib3/urllib3/commit/8864ac407bba8607950025e0979c4c69bc7abc7b"
        },
        {
          "category": "external",
          "summary": "https://github.com/urllib3/urllib3/security/advisories/GHSA-38jv-5279-wg99",
          "url": "https://github.com/urllib3/urllib3/security/advisories/GHSA-38jv-5279-wg99"
        }
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      "release_date": "2026-01-07T22:09:01.936000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-01-22T11:34:41+00:00",
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          "product_ids": [
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            "cert-manager operator for Red Hat OpenShift 1.18:registry.redhat.io/cert-manager/jetstack-cert-manager-rhel9@sha256:28b8e7c5383ce99ef0589242494e9cbb30d0ef94ee16a54c191ab0b434128923_arm64",
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          "url": "https://access.redhat.com/errata/RHSA-2026:0990"
        }
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
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            "cert-manager operator for Red Hat OpenShift 1.18:registry.redhat.io/cert-manager/jetstack-cert-manager-acmesolver-rhel9@sha256:399c99087dd8b4b6f790dddaa6cd284a1aa459eb641c5b788e1b926e9d0f6a7e_amd64",
            "cert-manager operator for Red Hat OpenShift 1.18:registry.redhat.io/cert-manager/jetstack-cert-manager-acmesolver-rhel9@sha256:41f1f7807a760ba804e71971810977dc63010a17ccd74b607aaf01fb28386cbc_s390x",
            "cert-manager operator for Red Hat OpenShift 1.18:registry.redhat.io/cert-manager/jetstack-cert-manager-acmesolver-rhel9@sha256:cbfb1c86b988a242eb25774b3f1f32d1f29795335c6e4e49f6b3b0065c5af459_arm64",
            "cert-manager operator for Red Hat OpenShift 1.18:registry.redhat.io/cert-manager/jetstack-cert-manager-rhel9@sha256:1f62aebd5bbdd5809116b4575adfec3d51c24e48ce188aaf3b06dd26826bc737_s390x",
            "cert-manager operator for Red Hat OpenShift 1.18:registry.redhat.io/cert-manager/jetstack-cert-manager-rhel9@sha256:28b8e7c5383ce99ef0589242494e9cbb30d0ef94ee16a54c191ab0b434128923_arm64",
            "cert-manager operator for Red Hat OpenShift 1.18:registry.redhat.io/cert-manager/jetstack-cert-manager-rhel9@sha256:3ca7fb070c05efc25fe53af6fc922875ecb9d11943d3c243b2840d7ca2b1aa33_amd64",
            "cert-manager operator for Red Hat OpenShift 1.18:registry.redhat.io/cert-manager/jetstack-cert-manager-rhel9@sha256:5c7fc6f10f7d9f5299ca42feadd98da0ce9d53835e89f8690a74ccd62e20dde5_ppc64le"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "urllib3: urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects (streaming API)"
    }
  ]
}


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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.