{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"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": "2026-10-10T10:22:55.843Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache", "dateUpdated": "2026-10-10T10:22:55.843Z"}, "title": "Apache DataSketches: datasketches-cpp: HLL CouponList Deserialization Buffer Overflow allows memory corruption via a crafted sketch", "problemTypes": [{"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"}], "defaultStatus": "unaffected", "collectionURL": "https://github.com", "packageName": "apache/datasketches-cpp"}], "descriptions": [{"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.", "lang": "en", "supportingMedia": [{"type": "text/html", "base64": false, "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."}]}], "references": [{"url": "https://lists.apache.org/thread/n2oc2j841dzsv4239jjp08of66bo79c5", "tags": ["vendor-advisory"]}, {"url": "https://github.com/apache/datasketches-cpp/releases/tag/5.3.0", "tags": ["release-notes"]}], "metrics": [{"other": {"type": "Textual description of severity", "content": {"text": "moderate"}}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "credits": [{"lang": "en", "value": "Reported anonymously.", "type": "finder"}], "x_generator": {"engine": "Vulnogram 1.0.3"}}}}

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