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              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
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              "baseSeverity": "CRITICAL",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
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              "content": {
                "id": "CVE-2026-103635",
                "options": [
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                    "Automatable": "yes"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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        "title": "CISA ADP Vulnrichment"
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          "defaultStatus": "unaffected",
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              "value": "Out-of-bounds read in the compact Theta sketch deserialization of Apache DataSketches C++ (repo: datasketches-cpp).\u003cbr\u003e\u003cbr\u003ecompact_theta_sketch::deserialize() and wrapped_compact_theta_sketch::wrap() read header fields before checking that the input was long enough. For the compressed format, the size check could be defeated by a 32-bit overflow, and two header fields that control decoding were not validated; this also affected deserialization from a stream. A crafted or truncated sketch could cause a read past the end of the input. In the compressed case the over-read can be large, and the bytes read can become part of the deserialized sketch. This can cause a crash (denial of service) and could expose adjacent memory contents.\u003cbr\u003e\u003cbr\u003eThis issue affects Apache DataSketches C++: from 3.1.0 before 5.3.0. Only applications that deserialize Theta sketches from untrusted sources are affected.\u003cbr\u003e\u003cbr\u003eUsers are recommended to upgrade to version 5.3.0, which fixes this issue."
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              "cweId": "CWE-190",
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        "shortName": "apache"
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          "url": "https://lists.apache.org/thread/15b86y9jstco39kzppjw7l5kvhjvwqvv"
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          "url": "https://github.com/apache/datasketches-cpp/releases/tag/5.3.0"
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      "source": {
        "discovery": "EXTERNAL"
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      "title": "Apache DataSketches: datasketches-cpp: Out-of-bounds read in compact Theta sketch deserialization allows denial of service via a crafted sketch",
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