{"id":"CVE-2026-103635","title":"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…","summary":"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…","severity":"none","cwe":["CWE-125","CWE-190"],"published":"2026-10-10","updated":"2026-10-10","sourceUpdated":"2026-10-10T13:17:31.060","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-103635","references":[{"url":"https://github.com/apache/datasketches-cpp/releases/tag/5.3.0","label":"security@apache.org"},{"url":"https://lists.apache.org/thread/15b86y9jstco39kzppjw7l5kvhjvwqvv","label":"security@apache.org"},{"url":"http://www.openwall.com/lists/oss-security/2026/10/10/5","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"ingestedAt":"2026-10-10T11:31:21.932Z","epss":0.00198,"epssPercentile":0.08815,"slug":"CVE-2026-103635","body":"## Overview\n\nOut-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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}