EUVD-2026-96309

Out-of-bounds read in the VarOpt union deserialization of Apache DataSketches C++ repo: datasketches-cpp. varoptunion::deserialize read the 32-byte preamble of a non-empty union after checking that only 8 bytes were available, so a truncated serialized union could cause a read of up to 24 bytes...

CVE-2026-103636

Out-of-bounds read in the VarOpt union deserialization of Apache DataSketches C++ repo: datasketches-cpp. varoptunion::deserialize read the 32-byte preamble of a non-empty union after checking that only 8 bytes were available, so a truncated serialized union could cause a read of up to 24 bytes...

CVE-2026-103636 Apache DataSketches: datasketches-cpp: Out-of-bounds read in VarOpt union deserialization allows denial of service via a truncated sketch

Out-of-bounds read in the VarOpt union deserialization of Apache DataSketches C++ repo: datasketches-cpp. varoptunion::deserialize read the 32-byte preamble of a non-empty union after checking that only 8 bytes were available, so a truncated serialized union could cause a read of up to 24 bytes...

CVE-2026-103636

The Apache DataSketches C++ library (repo: datasketches-cpp ) contains an out-of-bounds read vulnerability in the VarOpt union deserialization function. The var_opt_union::deserialize() function fails to properly validate the preamble of a non-empty union, potentially reading up to 24 bytes past ...