{
  "document": {
    "aggregate_severity": {
      "namespace": "https://access.redhat.com/security/updates/classification/",
      "text": "Important"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Copyright \u00a9 Red Hat, Inc. All rights reserved.",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "summary",
        "text": "An update for Red Hat Hardened Images RPMs is now available.",
        "title": "Topic"
      },
      {
        "category": "general",
        "text": "This update includes the following RPMs:\n\noauth2-proxy:\n  * oauth2-proxy-7.15.5-0.1.hum1 (aarch64, x86_64)\n  * oauth2-proxy-7.15.5-0.1.hum1.src (src)",
        "title": "Details"
      },
      {
        "category": "legal_disclaimer",
        "text": "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.",
        "title": "Terms of Use"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://access.redhat.com/security/team/contact/",
      "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.",
      "name": "Red Hat Product Security",
      "namespace": "https://www.redhat.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "https://access.redhat.com/errata/RHSA-2026:74536",
        "url": "https://access.redhat.com/errata/RHSA-2026:74536"
      },
      {
        "category": "external",
        "summary": "https://images.redhat.com/",
        "url": "https://images.redhat.com/"
      },
      {
        "category": "external",
        "summary": "https://access.redhat.com/security/cve/CVE-2026-76835",
        "url": "https://access.redhat.com/security/cve/CVE-2026-76835"
      },
      {
        "category": "external",
        "summary": "https://access.redhat.com/security/updates/classification/",
        "url": "https://access.redhat.com/security/updates/classification/"
      },
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_74536.json"
      }
    ],
    "title": "Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update",
    "tracking": {
      "current_release_date": "2026-10-02T02:22:47+00:00",
      "generator": {
        "date": "2026-10-02T02:22:47+00:00",
        "engine": {
          "name": "Red Hat SDEngine",
          "version": "5.4.0"
        }
      },
      "id": "RHSA-2026:74536",
      "initial_release_date": "2026-10-01T16:26:14+00:00",
      "revision_history": [
        {
          "date": "2026-10-01T16:26:14+00:00",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2026-10-01T16:41:59+00:00",
          "number": "2",
          "summary": "Last updated version"
        },
        {
          "date": "2026-10-02T02:22:47+00:00",
          "number": "3",
          "summary": "Last generated version"
        }
      ],
      "status": "final",
      "version": "3"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "Red Hat Hardened Images",
                "product": {
                  "name": "Red Hat Hardened Images",
                  "product_id": "Red Hat Hardened Images",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:redhat:hummingbird:1"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "Red Hat Hardened Images"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "oauth2-proxy-0:7.15.5-0.1.hum1@aarch64",
                "product": {
                  "name": "oauth2-proxy-0:7.15.5-0.1.hum1@aarch64",
                  "product_id": "oauth2-proxy-0:7.15.5-0.1.hum1@aarch64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/redhat/oauth2-proxy@7.15.5-0.1.hum1?arch=aarch64\u0026distro=hummingbird-20251124\u0026repository_id=public-hummingbird-aarch64-rpms"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "aarch64"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "oauth2-proxy-0:7.15.5-0.1.hum1@src",
                "product": {
                  "name": "oauth2-proxy-0:7.15.5-0.1.hum1@src",
                  "product_id": "oauth2-proxy-0:7.15.5-0.1.hum1@src",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/redhat/oauth2-proxy@7.15.5-0.1.hum1?arch=src\u0026distro=hummingbird-20251124\u0026repository_id=public-hummingbird-source-rpms"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "src"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "oauth2-proxy-0:7.15.5-0.1.hum1@x86_64",
                "product": {
                  "name": "oauth2-proxy-0:7.15.5-0.1.hum1@x86_64",
                  "product_id": "oauth2-proxy-0:7.15.5-0.1.hum1@x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/redhat/oauth2-proxy@7.15.5-0.1.hum1?arch=x86_64\u0026distro=hummingbird-20251124\u0026repository_id=public-hummingbird-x86_64-rpms"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "x86_64"
          }
        ],
        "category": "vendor",
        "name": "Red Hat"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "oauth2-proxy-0:7.15.5-0.1.hum1@aarch64 as a component of Red Hat Hardened Images",
          "product_id": "Red Hat Hardened Images:oauth2-proxy-0:7.15.5-0.1.hum1@aarch64"
        },
        "product_reference": "oauth2-proxy-0:7.15.5-0.1.hum1@aarch64",
        "relates_to_product_reference": "Red Hat Hardened Images"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "oauth2-proxy-0:7.15.5-0.1.hum1@src as a component of Red Hat Hardened Images",
          "product_id": "Red Hat Hardened Images:oauth2-proxy-0:7.15.5-0.1.hum1@src"
        },
        "product_reference": "oauth2-proxy-0:7.15.5-0.1.hum1@src",
        "relates_to_product_reference": "Red Hat Hardened Images"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "oauth2-proxy-0:7.15.5-0.1.hum1@x86_64 as a component of Red Hat Hardened Images",
          "product_id": "Red Hat Hardened Images:oauth2-proxy-0:7.15.5-0.1.hum1@x86_64"
        },
        "product_reference": "oauth2-proxy-0:7.15.5-0.1.hum1@x86_64",
        "relates_to_product_reference": "Red Hat Hardened Images"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-76835",
      "cwe": {
        "id": "CWE-290",
        "name": "Authentication Bypass by Spoofing"
      },
      "discovery_date": "2026-08-24T18:11:50.963586+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2522418"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in oauth2-proxy. When configured in reverse-proxy mode without explicit trusted proxy settings, the application defaults to treating all incoming network traffic as originating from trusted proxies. A remote, unauthenticated attacker can exploit this issue by sending a request with a forged X-Forwarded-Uri header that matches an allow-listed path. As a result, the proxy bypasses authentication controls and grants unauthorized access to protected upstream services.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "github.com/oauth2-proxy/oauth2-proxy: OAuth2 Proxy 7.15.2 through 7.15.4 Authentication Bypass via X-Forwarded-Uri Under the Default Trusted Proxy Set",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This vulnerability is rated as Important severity as an unauthenticated remote attacker can bypass authentication checks to access protected upstream services without authorization. The issue occurs when OAuth2 Proxy operates in reverse proxy mode with route-skipping rules enabled and lacks an explicitly restricted trusted proxy configuration, causing it to trust header inputs from any remote source. Because authentication enforcement fails before requests are dispatched upstream, unauthorized users can gain full access to sensitive internal endpoints. \n\nThis is vulnerability is rated as Important rather than Critical because the reverse proxy mode is required which is not part of the default configuration for Red Hat products.",
          "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": {
        "fixed": [
          "Red Hat Hardened Images:oauth2-proxy-0:7.15.5-0.1.hum1@aarch64",
          "Red Hat Hardened Images:oauth2-proxy-0:7.15.5-0.1.hum1@src",
          "Red Hat Hardened Images:oauth2-proxy-0:7.15.5-0.1.hum1@x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-76835"
        },
        {
          "category": "external",
          "summary": "RHBZ#2522418",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2522418"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-76835",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-76835"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-76835",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-76835"
        },
        {
          "category": "external",
          "summary": "https://github.com/oauth2-proxy/oauth2-proxy",
          "url": "https://github.com/oauth2-proxy/oauth2-proxy"
        },
        {
          "category": "external",
          "summary": "https://github.com/oauth2-proxy/oauth2-proxy/blob/v7.15.4/pkg/apis/middleware/scope.go",
          "url": "https://github.com/oauth2-proxy/oauth2-proxy/blob/v7.15.4/pkg/apis/middleware/scope.go"
        },
        {
          "category": "external",
          "summary": "https://github.com/oauth2-proxy/oauth2-proxy/issues/3506",
          "url": "https://github.com/oauth2-proxy/oauth2-proxy/issues/3506"
        },
        {
          "category": "external",
          "summary": "https://github.com/oauth2-proxy/oauth2-proxy/security/advisories/GHSA-7x63-xv5r-3p2x",
          "url": "https://github.com/oauth2-proxy/oauth2-proxy/security/advisories/GHSA-7x63-xv5r-3p2x"
        },
        {
          "category": "external",
          "summary": "https://www.vulncheck.com/advisories/oauth2-proxy-through-authentication-bypass-via-x-forwarded-uri-under-the-default-trusted-proxy-set",
          "url": "https://www.vulncheck.com/advisories/oauth2-proxy-through-authentication-bypass-via-x-forwarded-uri-under-the-default-trusted-proxy-set"
        }
      ],
      "release_date": "2026-08-24T17:55:39.829000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-01T16:26:14+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:oauth2-proxy-0:7.15.5-0.1.hum1@aarch64",
            "Red Hat Hardened Images:oauth2-proxy-0:7.15.5-0.1.hum1@src",
            "Red Hat Hardened Images:oauth2-proxy-0:7.15.5-0.1.hum1@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:74536"
        },
        {
          "category": "workaround",
          "details": "To mitigate this issue without patching, apply one of the following configuration controls:\n\n1. Restrict trusted proxy IP addresses in OAuth2 Proxy:\nExplicitly set the `--trusted-proxy-ip` command-line argument (or the `trusted_proxy_ip` configuration file parameter) to the specific IP address or CIDR range of authorized upstream reverse proxies or load balancers rather than relying on the default:\n```\n--trusted-proxy-ip=\u003cTRUSTED_PROXY_IP_OR_CIDR\u003e\n```\n\n2. Sanitize forwarded headers at the perimeter reverse proxy:\nConfigure intermediate ingress controllers or front-facing reverse proxies (such as NGINX) to strip client-supplied `X-Forwarded-Uri` headers or overwrite them with the actual request URI before forwarding traffic to OAuth2 Proxy:\n```\nproxy_set_header X-Forwarded-Uri $request_uri;\n```\n\nWarning: Applying these configuration adjustments requires restarting or reloading the affected OAuth2 Proxy or front-end proxy services, which may cause a brief interruption to active network sessions.",
          "product_ids": [
            "Red Hat Hardened Images:oauth2-proxy-0:7.15.5-0.1.hum1@aarch64",
            "Red Hat Hardened Images:oauth2-proxy-0:7.15.5-0.1.hum1@src",
            "Red Hat Hardened Images:oauth2-proxy-0:7.15.5-0.1.hum1@x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:oauth2-proxy-0:7.15.5-0.1.hum1@aarch64",
            "Red Hat Hardened Images:oauth2-proxy-0:7.15.5-0.1.hum1@src",
            "Red Hat Hardened Images:oauth2-proxy-0:7.15.5-0.1.hum1@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "github.com/oauth2-proxy/oauth2-proxy: OAuth2 Proxy 7.15.2 through 7.15.4 Authentication Bypass via X-Forwarded-Uri Under the Default Trusted Proxy Set"
    }
  ]
}