{"schema":"threatline.record/2","record":{"id":"CVE-2026-103635","aliases":[],"summary":"Apache DataSketches: datasketches-cpp: Out-of-bounds read in compact Theta sketch deserialization allows denial of service via a crafted sketch","details":"Out-of-bounds read in the compact Theta sketch deserialization of Apache DataSketches C++ (repo: datasketches-cpp).\n\ncompact_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.\n\nThis issue affects Apache DataSketches C++: from 3.1.0 before 5.3.0. Only applications that deserialize Theta 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-2026-103635","source_modified_at":"2026-10-16T15:28:02.277Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"Apache DataSketches","vendor":"Apache Software Foundation","versions":[{"status":"affected","version":"3.1.0","lessThanOrEqual":"5.2.0","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[],"cvss":9.1,"severity":"Critical","kev":{"listed":false},"epss":{"probability":0.00605,"percentile":0.48319,"score_date":"2026-10-23"},"published_at":"2026-10-10T10:23:48.598Z","modified_at":"2026-10-16T15:28:02.277Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-103635","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-16T15:28:02.277Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-103635","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/15b86y9jstco39kzppjw7l5kvhjvwqvv","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":"partial","assessed_at":"2026-10-16T15:27:43.270802Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-16T15:28:02.277Z","content_hash":"92c74f53330cf2d4953a551c1e34853427ef87170432244b2a8f5eb2c10f8922"}}