{"schema":"threatline.record/2","record":{"id":"CVE-2026-103501","aliases":[],"summary":"Apache DataSketches: datasketches-cpp: HLL CouponList Deserialization Buffer Overflow allows memory corruption via a crafted sketch","details":"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.","categories":["Unclassified"],"product":"Apache DataSketches","vendor":"Apache Software Foundation","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-103501","source_modified_at":"2026-10-16T15:22:14.055Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"Apache DataSketches","vendor":"Apache Software Foundation","versions":[{"status":"affected","version":"1.0.0-incubating","lessThanOrEqual":"5.2.0","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[],"cvss":9.8,"severity":"Critical","kev":{"listed":false},"epss":{"probability":0.00655,"percentile":0.50758,"score_date":"2026-10-23"},"published_at":"2026-10-10T10:22:55.843Z","modified_at":"2026-10-16T15:22:14.055Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-103501","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-16T15:22:14.055Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-103501","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://lists.apache.org/thread/n2oc2j841dzsv4239jjp08of66bo79c5","tags":["vendor-advisory"]},{"source":"CVE List","url":"https://github.com/apache/datasketches-cpp/releases/tag/5.3.0","tags":["release-notes"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CISA ADP","ssvc":{"exploitation":"none","automatable":"yes","technical_impact":"total","assessed_at":"2026-10-16T15:21:43.590609Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-16T15:22:14.055Z","content_hash":"2faf30593e901c9c92f3bc8484864cbfe3bfeb39434f371529a971b71f0fed8c"}}