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        "cveId": "CVE-2026-103501",
        "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
        "state": "PUBLISHED",
        "assignerShortName": "apache",
        "dateReserved": "2026-09-30T17:29:03.761Z",
        "datePublished": "2026-10-10T10:22:55.843Z",
        "dateUpdated": "2026-10-16T15:22:14.055Z"
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                "shortName": "apache",
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            },
            "title": "Apache DataSketches: datasketches-cpp: HLL CouponList Deserialization Buffer Overflow allows memory corruption via a crafted sketch",
            "problemTypes": [
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                    "descriptions": [
                        {
                            "description": "CWE-122 Heap-based buffer overflow",
                            "lang": "en",
                            "cweId": "CWE-122",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "description": "CWE-1284 Improper validation of specified quantity in input",
                            "lang": "en",
                            "cweId": "CWE-1284",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "source": {
                "discovery": "EXTERNAL"
            },
            "affected": [
                {
                    "vendor": "Apache Software Foundation",
                    "product": "Apache DataSketches",
                    "packageURL": "pkg:github/apache/datasketches-cpp",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "1.0.0-incubating",
                            "lessThanOrEqual": "5.2.0",
                            "versionType": "semver"
                        }
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                    "defaultStatus": "unaffected",
                    "collectionURL": "https://github.com",
                    "packageName": "apache/datasketches-cpp"
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            "descriptions": [
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                    "value": "Heap buffer overflow in the HLL sketch deserialization of Apache DataSketches C++ (repo: datasketches-cpp).\n\nWhen deserializing a sketch in LIST mode, from either a byte buffer or a stream, the coupon count was read from the input and used as the number of entries to copy into a fixed buffer of 8 entries, without checking it against the buffer's capacity. A crafted sketch could cause a write of up to 988 bytes past the end of this internal heap buffer. This can corrupt heap memory, causing a crash and potentially enabling further exploitation.\n\nThis issue affects Apache DataSketches C++: from 1.0.0-incubating before 5.3.0. Only applications that deserialize HLL sketches from untrusted sources are affected.\n\nUsers are recommended to upgrade to version 5.3.0, which fixes this issue.",
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                            "value": "Heap buffer overflow in the HLL sketch deserialization of Apache DataSketches C++ (repo: datasketches-cpp).<br><br>When deserializing a sketch in LIST mode, from either a byte buffer or a stream, the coupon count was read from the input and used as the number of entries to copy into a fixed buffer of 8 entries, without checking it against the buffer's capacity. A crafted sketch could cause a write of up to 988 bytes past the end of this internal heap buffer. This can corrupt heap memory, causing a crash and potentially enabling further exploitation.<br><br>This issue affects Apache DataSketches C++: from 1.0.0-incubating before 5.3.0. Only applications that deserialize HLL sketches from untrusted sources are affected.<br><br>Users are recommended to upgrade to version 5.3.0, which fixes this issue."
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            "references": [
                {
                    "url": "https://lists.apache.org/thread/n2oc2j841dzsv4239jjp08of66bo79c5",
                    "tags": [
                        "vendor-advisory"
                    ]
                },
                {
                    "url": "https://github.com/apache/datasketches-cpp/releases/tag/5.3.0",
                    "tags": [
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                }
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                        "content": {
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                            "lang": "en",
                            "value": "GENERAL"
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                    "value": "Reported anonymously.",
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                "title": "CVE Program Container",
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                        "url": "http://www.openwall.com/lists/oss-security/2026/10/10/2"
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                            "scope": "UNCHANGED",
                            "version": "3.1",
                            "baseScore": 9.8,
                            "attackVector": "NETWORK",
                            "baseSeverity": "CRITICAL",
                            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                            "integrityImpact": "HIGH",
                            "userInteraction": "NONE",
                            "attackComplexity": "LOW",
                            "availabilityImpact": "HIGH",
                            "privilegesRequired": "NONE",
                            "confidentialityImpact": "HIGH"
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                            "content": {
                                "timestamp": "2026-10-16T15:21:43.590609Z",
                                "id": "CVE-2026-103501",
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                                        "Exploitation": "none"
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