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              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
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                "id": "CVE-2026-103636",
                "options": [
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          "shortName": "CISA-ADP"
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        "title": "CISA ADP Vulnrichment"
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              "value": "Out-of-bounds read in the VarOpt union deserialization of Apache DataSketches C++ (repo: datasketches-cpp).\u003cbr\u003e\u003cbr\u003evar_opt_union::deserialize() read the 32-byte preamble of a non-empty union after checking that only 8 bytes were available, so a truncated serialized union could cause a read of up to 24 bytes past the end of the input. For such inputs, the size remaining for the embedded sketch was also computed by an unsigned subtraction that could wrap around, so the embedded sketch\u0027s own size checks no longer limited reads to the input. The bytes read can become part of the deserialized union\u0027s state. This can cause a crash (denial of service) and could expose adjacent memory contents.\u003cbr\u003e\u003cbr\u003eThis issue affects Apache DataSketches C++: from 2.0.0-incubating before 5.3.0. Only applications that deserialize VarOpt unions 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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          "url": "https://lists.apache.org/thread/znn94s463w7wy125khcywxsp82y2qkq5"
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          "url": "https://github.com/apache/datasketches-cpp/releases/tag/5.3.0"
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      "source": {
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      "title": "Apache DataSketches: datasketches-cpp: Out-of-bounds read in VarOpt union deserialization allows denial of service via a truncated sketch",
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