RHSA-2026:74791

Vulnerability from csaf_redhat - Published: 2026-10-01 22:38 - Updated: 2026-10-02 04:42
Summary
Red Hat Security Advisory: Gatekeeper v3.20.1 security update
Severity
Important
Notes
Topic: Gatekeeper v3.20.1
Details: Gatekeeper v3.20.1 Gatekeeper is a validating webhook with auditing capabilities that can enforce custom resource definition-based policies that are run with the Open Policy Agent (OPA). Gatekeeper is supported through a Red Hat Advanced Cluster Management for Kubernetes subscription. There are new parameters for the operator configuration, starting with version 3.20. View the following parameter descriptions: - `mutatingWebhookConfig`: Use the `mutatingWebhookConfig` parameter with the `webhook` parameter for overrides and configurations specific to the mutating webhook. The mutation-specific fields in `webhook` are deprecated. - `timeoutSeconds`: Use the `timeoutSeconds` parameter to customize webhook timeouts. - `rules`: Use the `rules` parameter to customize the requests that are handled by the webhook. Unlike other fields, the `rules` parameter values are specified separately for validating and mutating webhooks. Setting the `rules` parameter overrides anything that you set in the `operations` parameter. - `podAnnotations`: Specify the `podAnnotations` in `spec.audit` or `spec.webhook` to set deployment-specific annotations. Additional release notes: - Open Policy Agent Gatekeeper v3.20.0: https://github.com/open-policy-agent/gatekeeper/releases/tag/v3.20.0 - Open Policy Agent Gatekeeper v3.20.1: https://github.com/open-policy-agent/gatekeeper/releases/tag/v3.20.1
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-2026-32280

A flaw was found in the Go standard library packages `crypto/x509` and `crypto/tls`. During the process of building a certificate chain, an attacker can provide a large number of intermediate certificates. This excessive input is not properly limited, leading to an uncontrolled amount of work being performed. This can result in a denial of service (DoS) condition, making the affected system or application unavailable to legitimate users.

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
Affected products
Product Identifier Version Remediation
Unresolved product id: Gatekeeper 3.20:registry.redhat.io/gatekeeper/gatekeeper-rhel9-operator@sha256:0786205331ca629fb326c7239ce856206e4843da1308c74097b1cea8e41a6c7f_amd64 —
Vendor Fix fix
Unresolved product id: Gatekeeper 3.20:registry.redhat.io/gatekeeper/gatekeeper-rhel9-operator@sha256:2cc909243fab02d360477f11c857cf0bafc1388a3ed34cd77a6fd8f74f5358b4_arm64 —
Vendor Fix fix
Unresolved product id: Gatekeeper 3.20:registry.redhat.io/gatekeeper/gatekeeper-rhel9-operator@sha256:6f240a461b9736dda251112115cf4f226990963c266772c7bf8cb742a1245c33_s390x —
Vendor Fix fix
Unresolved product id: Gatekeeper 3.20:registry.redhat.io/gatekeeper/gatekeeper-rhel9-operator@sha256:cc13a5a7035928f24f40e0959fc105111c47ceea5c4de920171ed16062ff2109_ppc64le —
Vendor Fix fix
Product Identifier Version Remediation
Unresolved product id: Gatekeeper 3.20:registry.redhat.io/gatekeeper/gatekeeper-operator-bundle@sha256:553df1c01fb5af70f42f32566ec9770ada039236fd634c512897010fc782e1cd_amd64 —
Unresolved product id: Gatekeeper 3.20:registry.redhat.io/gatekeeper/gatekeeper-rhel9@sha256:07474cc4fa38c312df45aa140ccbdf86de8fc6dd841d619d709b309ac88f844c_ppc64le —
Unresolved product id: Gatekeeper 3.20:registry.redhat.io/gatekeeper/gatekeeper-rhel9@sha256:17480df2c9bbb1c7ae8c276a6231784b6a1835ba2cb60bea5470d37a562f0e52_arm64 —
Unresolved product id: Gatekeeper 3.20:registry.redhat.io/gatekeeper/gatekeeper-rhel9@sha256:1ca76ad02ddf38c6330452d55e91d6400794698465e9cb041efb2f15093a8fca_s390x —
Unresolved product id: Gatekeeper 3.20:registry.redhat.io/gatekeeper/gatekeeper-rhel9@sha256:e85d20ddc26eeef4a82e6c065f8b55e94d48ba8798aad32b4fe3d56c1a962e2a_amd64 —
Threats
Impact Important
CVE-2026-32283

A flaw was found in the `crypto/tls` package within the Go (golang) standard library, specifically affecting TLS 1.3 connections. A remote attacker can exploit this vulnerability by sending multiple key update messages in a single record after the handshake. This can cause the connection to deadlock, leading to uncontrolled consumption of resources and ultimately a denial of service (DoS).

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-764 - Multiple Locks of a Critical Resource
Affected products
Fixed 4 products, the same list as for CVE-2026-32280
Known not affected 5 products, the same list as for CVE-2026-32280
Threats
Impact Important
References
To clipboard 

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        "name": "Allocation of Resources Without Limits or Throttling"
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          "category": "description",
          "text": "A flaw was found in the Go standard library packages `crypto/x509` and `crypto/tls`. During the process of building a certificate chain, an attacker can provide a large number of intermediate certificates. This excessive input is not properly limited, leading to an uncontrolled amount of work being performed. This can result in a denial of service (DoS) condition, making the affected system or application unavailable to legitimate users.",
          "title": "Vulnerability description"
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          "text": "crypto/x509: crypto/tls: golang: Go: Denial of Service vulnerability in certificate chain building",
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          "text": "This is an Important denial of service vulnerability in the Go standard library\u0027s certificate chain building process. Systems utilizing Go applications that process untrusted TLS certificates or X.509 certificate chains are susceptible to resource exhaustion when presented with an excessive number of intermediate certificates, potentially leading to service unavailability. This flaw impacts applications directly using `crypto/x509` or `crypto/tls`.",
          "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"
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          "summary": "https://pkg.go.dev/vuln/GO-2026-4947",
          "url": "https://pkg.go.dev/vuln/GO-2026-4947"
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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",
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      "title": "crypto/x509: crypto/tls: golang: Go: Denial of Service vulnerability in certificate chain building"
    },
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          "text": "A flaw was found in the `crypto/tls` package within the Go (golang) standard library, specifically affecting TLS 1.3 connections. A remote attacker can exploit this vulnerability by sending multiple key update messages in a single record after the handshake. This can cause the connection to deadlock, leading to uncontrolled consumption of resources and ultimately a denial of service (DoS).",
          "title": "Vulnerability description"
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          "text": "crypto/tls: golang: Go crypto/tls: Denial of Service via multiple TLS 1.3 key update messages",
          "title": "Vulnerability summary"
        },
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          "text": "Important: A flaw in the Go `crypto/tls` package allows a remote attacker to cause a denial of service in applications using TLS 1.3. By sending multiple key update messages in a single record post-handshake, an attacker can trigger a connection deadlock, leading to uncontrolled resource consumption. This impacts Red Hat products utilizing the affected Go standard library for TLS 1.3 connections.",
          "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"
        }
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            "Gatekeeper 3.20:registry.redhat.io/gatekeeper/gatekeeper-rhel9-operator@sha256:2cc909243fab02d360477f11c857cf0bafc1388a3ed34cd77a6fd8f74f5358b4_arm64",
            "Gatekeeper 3.20:registry.redhat.io/gatekeeper/gatekeeper-rhel9-operator@sha256:6f240a461b9736dda251112115cf4f226990963c266772c7bf8cb742a1245c33_s390x",
            "Gatekeeper 3.20:registry.redhat.io/gatekeeper/gatekeeper-rhel9-operator@sha256:cc13a5a7035928f24f40e0959fc105111c47ceea5c4de920171ed16062ff2109_ppc64le",
            "Gatekeeper 3.20:registry.redhat.io/gatekeeper/gatekeeper-rhel9@sha256:07474cc4fa38c312df45aa140ccbdf86de8fc6dd841d619d709b309ac88f844c_ppc64le",
            "Gatekeeper 3.20:registry.redhat.io/gatekeeper/gatekeeper-rhel9@sha256:17480df2c9bbb1c7ae8c276a6231784b6a1835ba2cb60bea5470d37a562f0e52_arm64",
            "Gatekeeper 3.20:registry.redhat.io/gatekeeper/gatekeeper-rhel9@sha256:1ca76ad02ddf38c6330452d55e91d6400794698465e9cb041efb2f15093a8fca_s390x",
            "Gatekeeper 3.20:registry.redhat.io/gatekeeper/gatekeeper-rhel9@sha256:e85d20ddc26eeef4a82e6c065f8b55e94d48ba8798aad32b4fe3d56c1a962e2a_amd64"
          ]
        }
      ],
      "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": [
            "Gatekeeper 3.20:registry.redhat.io/gatekeeper/gatekeeper-operator-bundle@sha256:553df1c01fb5af70f42f32566ec9770ada039236fd634c512897010fc782e1cd_amd64",
            "Gatekeeper 3.20:registry.redhat.io/gatekeeper/gatekeeper-rhel9-operator@sha256:0786205331ca629fb326c7239ce856206e4843da1308c74097b1cea8e41a6c7f_amd64",
            "Gatekeeper 3.20:registry.redhat.io/gatekeeper/gatekeeper-rhel9-operator@sha256:2cc909243fab02d360477f11c857cf0bafc1388a3ed34cd77a6fd8f74f5358b4_arm64",
            "Gatekeeper 3.20:registry.redhat.io/gatekeeper/gatekeeper-rhel9-operator@sha256:6f240a461b9736dda251112115cf4f226990963c266772c7bf8cb742a1245c33_s390x",
            "Gatekeeper 3.20:registry.redhat.io/gatekeeper/gatekeeper-rhel9-operator@sha256:cc13a5a7035928f24f40e0959fc105111c47ceea5c4de920171ed16062ff2109_ppc64le",
            "Gatekeeper 3.20:registry.redhat.io/gatekeeper/gatekeeper-rhel9@sha256:07474cc4fa38c312df45aa140ccbdf86de8fc6dd841d619d709b309ac88f844c_ppc64le",
            "Gatekeeper 3.20:registry.redhat.io/gatekeeper/gatekeeper-rhel9@sha256:17480df2c9bbb1c7ae8c276a6231784b6a1835ba2cb60bea5470d37a562f0e52_arm64",
            "Gatekeeper 3.20:registry.redhat.io/gatekeeper/gatekeeper-rhel9@sha256:1ca76ad02ddf38c6330452d55e91d6400794698465e9cb041efb2f15093a8fca_s390x",
            "Gatekeeper 3.20:registry.redhat.io/gatekeeper/gatekeeper-rhel9@sha256:e85d20ddc26eeef4a82e6c065f8b55e94d48ba8798aad32b4fe3d56c1a962e2a_amd64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "crypto/tls: golang: Go crypto/tls: Denial of Service via multiple TLS 1.3 key update messages"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.