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        "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 Cloud Linux Inc. and provide a link to the original.",
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          "date": "2026-08-25T13:19:00Z",
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        "id": "CWE-134",
        "name": "Use of Externally-Controlled Format String"
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          "category": "description",
          "text": "Issue summary: OpenSSL CMP response validation passed an unexpected response\nsender distinguished name directly as the format string to `ERR_raise_data()`.\n\nImpact summary: A malicious or intercepted CMP endpoint can crash a CMP client\nthat enforces an expected sender or uses a pinned server certificate whose\nsubject becomes the default expected sender.\n\nCWE: CWE-134 (Use of Externally-Controlled Format String)\n\nDescription: When validating a received CMP message, ossl_cmp_msg_check_update()\nconverts the peer-supplied sender distinguished name with X509_NAME_oneline()\nand passes it directly as the format argument to ERR_raise_data(). Percent\ncharacters survive the conversion, so a sender DN such as \"CN=%s%n\" reaches\nBIO_vsnprintf() as an attacker-controlled format string with no matching variadic\narguments. This path is only reached when the caller configures an expected\nsender or pins a server certificate, which is the normal configuration for a\nCMP client validating server responses.\n\nSince the attacker controls the format string but none of the variadic\narguments, such specifiers as %s and %n dereference or write through unrelated\nstack contents and crash the client. The reliable consequence is a denial of\nservice, when the response comes from a malicious or intercepted CMP endpoint.\nThere is no controlled memory write, arbitrary-address read, or reliable path\nto remote code execution.\n\nFIPS impact: no\n\nNo FIPS modules are affected by this issue, as the CMP protocol\nimplementation is outside the OpenSSL FIPS module boundary.",
          "title": "Vulnerability description"
        }
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-63073"
        },
        {
          "category": "external",
          "summary": "https://github.com/openssl/openssl/commit/0cc20b322639919aa423e90799d9a57c3b4b76ca",
          "url": "https://github.com/openssl/openssl/commit/0cc20b322639919aa423e90799d9a57c3b4b76ca"
        },
        {
          "category": "external",
          "summary": "https://github.com/openssl/openssl/commit/6a0acc072b4d37a7cac1252a29c1ce1f00c5ec29",
          "url": "https://github.com/openssl/openssl/commit/6a0acc072b4d37a7cac1252a29c1ce1f00c5ec29"
        },
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          "category": "external",
          "summary": "https://github.com/openssl/openssl/commit/7eb2e3ec9d1d4f35c8022fccd4b03398b3f33e21",
          "url": "https://github.com/openssl/openssl/commit/7eb2e3ec9d1d4f35c8022fccd4b03398b3f33e21"
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          "category": "external",
          "summary": "https://github.com/openssl/openssl/commit/a7e5a6eea8fd3ccca6b6fbba031a5fbf8a3d93b4",
          "url": "https://github.com/openssl/openssl/commit/a7e5a6eea8fd3ccca6b6fbba031a5fbf8a3d93b4"
        },
        {
          "category": "external",
          "summary": "https://openssl-library.org/news/secadv/20260825.txt",
          "url": "https://openssl-library.org/news/secadv/20260825.txt"
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      "release_date": "2026-08-25T13:19:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-09-14T08:05:16.585409Z",
          "details": "This is a client‑side format‑string bug confined to OpenSSL’s CMP response‑validation path and is reachable only when an application explicitly uses the CMP client with an expected sender or a pinned server certificate, so ordinary TLS/HTTPS usage is unaffected. The reliable effect is a crash (availability only) with no confidentiality or integrity impact and no viable path to code execution, and it is outside the FIPS module boundary. Because exploitation also requires a malicious or intercepted CMP endpoint to deliver a crafted DN, deployments that do not explicitly invoke CMP for certificate management can safely deprioritize this issue.",
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