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      "category" : "summary",
      "text" : "An update for the mod_auth_openidc:2.3 module is now available for Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Service.\n\nRed Hat Product Security has rated this update as having a security impact of Critical. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.",
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      "text" : "The mod_auth_openidc is an OpenID Connect authentication module for Apache HTTP Server. It enables an Apache HTTP Server to operate as an OpenID Connect Relying Party and/or OAuth 2.0 Resource Server. \n\nSecurity Fix(es):\n\n* cjose: OpenIDC/cjose uses all-zero Content Encryption Key for AES-CBC-HMAC JWE encryption (CVE-2026-53939)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
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      "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.",
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      "name" : "Insufficient Entropy"
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    "ids" : [ {
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      "text" : "2530243"
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      "category" : "description",
      "text" : "A flaw was found in cjose. When encrypting a JSON Web Encryption (JWE) object using AES-CBC-HMAC algorithms, the library initializes the encryption key with all-zero bytes instead of generating a secure random key. As a result, an attacker who intercepts the encrypted message can decrypt sensitive plaintext and alter or forge content, leading to information disclosure and loss of data integrity.",
      "title" : "Vulnerability description"
    }, {
      "category" : "summary",
      "text" : "cjose: OpenIDC/cjose uses all-zero Content Encryption Key for AES-CBC-HMAC JWE encryption",
      "title" : "Vulnerability summary"
    }, {
      "category" : "other",
      "text" : "A CRITICAL severity vulnerability was found in cjose, a C library implementing the Javascript Object Signing and Encryption (JOSE) standards. The cjose package is affected in Red Hat Enterprise Linux 10, Red Hat In-Vehicle OS 2, and Fedora as shipped by Red Hat. When cjose encrypts a JSON Web Encryption (JWE) object using an AES-CBC-HMAC content-encryption algorithm (A128CBC-HS256, A192CBC-HS384, or A256CBC-HS512) together with any key-management algorithm that generates a fresh content-encryption key (CEK), the CEK is initialized to all zero bytes instead of being securely randomly generated. The resulting JWE is therefore encrypted and authenticated under a fixed, publicly known key. An attacker who obtains the encrypted JWE can decrypt it to recover sensitive plaintext and can alter or forge the encrypted content, causing information disclosure and loss of data integrity; availability is not affected. Red Hat and upstream both rate this flaw CRITICAL with a CVSS 3.1 score of 9.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N), so there is no difference from the upstream severity. Fixes for the affected Red Hat product streams are being pursued through delegated resolution.",
      "title" : "Statement"
    }, {
      "category" : "general",
      "text" : "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
      "title" : "CVSS score applicability"
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    },
    "references" : [ {
      "category" : "self",
      "summary" : "Canonical URL",
      "url" : "https://access.redhat.com/security/cve/CVE-2026-53939"
    }, {
      "category" : "external",
      "summary" : "RHBZ#2530243",
      "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2530243"
    }, {
      "category" : "external",
      "summary" : "https://www.cve.org/CVERecord?id=CVE-2026-53939",
      "url" : "https://www.cve.org/CVERecord?id=CVE-2026-53939"
    }, {
      "category" : "external",
      "summary" : "https://nvd.nist.gov/vuln/detail/CVE-2026-53939",
      "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-53939"
    }, {
      "category" : "external",
      "summary" : "https://github.com/OpenIDC/cjose/commit/2a6e5bd969fa20059fb00913fb9f57d77ea6a4d9",
      "url" : "https://github.com/OpenIDC/cjose/commit/2a6e5bd969fa20059fb00913fb9f57d77ea6a4d9"
    }, {
      "category" : "external",
      "summary" : "https://github.com/OpenIDC/cjose/releases/tag/v0.6.2.6",
      "url" : "https://github.com/OpenIDC/cjose/releases/tag/v0.6.2.6"
    }, {
      "category" : "external",
      "summary" : "https://github.com/OpenIDC/cjose/security/advisories/GHSA-f6wf-pqg3-6wqq",
      "url" : "https://github.com/OpenIDC/cjose/security/advisories/GHSA-f6wf-pqg3-6wqq"
    } ],
    "release_date" : "2026-09-08T23:36:13.668000+00:00",
    "remediations" : [ {
      "category" : "vendor_fix",
      "date" : "2026-10-29T01:11:59+00:00",
      "details" : "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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      "restart_required" : {
        "category" : "none"
      },
      "url" : "https://access.redhat.com/errata/RHSA-2026:92158"
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    } ],
    "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"
      },
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    } ],
    "threats" : [ {
      "category" : "impact",
      "details" : "Critical"
    } ],
    "title" : "cjose: OpenIDC/cjose uses all-zero Content Encryption Key for AES-CBC-HMAC JWE encryption"
  } ]
}