{"id":"CVE-2026-103635","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.","modified":"2026-10-12T02:30:57.557565407Z","published":"2026-10-10T10:23:48.598Z","database_specific":{"cna_assigner":"apache","cwe_ids":["CWE-125","CWE-190"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103635.json"},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/10/10/5"},{"type":"WEB","url":"https://github.com"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103635.json"},{"type":"ADVISORY","url":"https://github.com/apache/datasketches-cpp/releases/tag/5.3.0"},{"type":"ADVISORY","url":"https://lists.apache.org/thread/15b86y9jstco39kzppjw7l5kvhjvwqvv"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-103635"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/apache/datasketches-cpp","events":[{"introduced":"a375f9805ab8064b20e6a1b82282e4d04b102328"},{"fixed":"5b5524f55d121225a7909c2851271327684585d7"}],"database_specific":{"extracted_events":[{"introduced":"3.1.0"},{"last_affected":"5.2.0"},{"fixed":"5.3.0"}],"source":["AFFECTED_FIELD","DESCRIPTION","REFERENCES"]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-103635.json"}}],"schema_version":"1.9.0"}