{"id":"CVE-2026-103635","revision":"ac72ef6031084e16ad2c79d8198a111e","records":[{"revision":"ac72ef6031084e16ad2c79d8198a111e","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-103635","aliases":[],"title":"Apache DataSketches: datasketches-cpp: Out-of-bounds read in compact Theta sketch deserialization allows denial of service via a crafted sketch","description":"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.","state":0,"publishedAt":"2026-10-10T10:23:48.598+00:00","modifiedAt":"2026-10-16T15:28:02.277+00:00","affected":[{"ecosystem":"https://github.com","name":"apache/datasketches-cpp","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Apache Software Foundation\",\n                    \"product\": \"Apache DataSketches\",\n                    \"packageURL\": \"pkg:github/apache/datasketches-cpp\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"3.1.0\",\n                            \"lessThanOrEqual\": \"5.2.0\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\",\n                    \"collectionURL\": \"https://github.com\",\n                    \"packageName\": \"apache/datasketches-cpp\"\n                }"}],"metrics":[],"references":["https://lists.apache.org/thread/15b86y9jstco39kzppjw7l5kvhjvwqvv","https://github.com/apache/datasketches-cpp/releases/tag/5.3.0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-103635","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-103635","identifiers":["CVE-2026-103635"]},"retained":false,"historicalAffected":[]}],"coverage":[]}