CVE-2026-103513
UnknownSummary
Out-of-bounds read and write in the CPC sketch deserialization of Apache DataSketches C++ (datasketches-cpp). A crafted serialized CPC sketch passed to cpc_sketch::deserialize() can cause the decompressor to read past the end of compressed data, and in the hybrid flavor can cause a write outside an internal heap buffer due to unvalidated decoded row indices. This can corrupt heap memory, causing a crash and potentially enabling further exploitation. Affects versions from 2.0.0-incubating before 5.3.0.
Risk Assessment
Applications deserializing CPC sketches from untrusted sources may crash or suffer memory corruption, potentially enabling further exploitation. This can lead to denial of service and process compromise.
Recommendation
Upgrade Apache DataSketches C++ to version 5.3.0. Avoid deserializing CPC sketches from untrusted sources.
Other vulnerabilities in Apache DataSketches C++
See all- CVE-2026-103636Unknown
Out-of-bounds read in the VarOpt union deserialization of Apache DataSketches C++ (datasketches-cpp). var_opt_union::deserialize() read the 32-byte preamble after checking only 8 bytes were available, so a truncated serialized union could cause a read of up to 24 bytes past the end of the input. This can cause a crash (denial of service) and could expose adjacent memory contents. Affects versions from 2.0.0-incubating before 5.3.0.
- CVE-2026-103635Unknown
Out-of-bounds read in the compact Theta sketch deserialization of Apache DataSketches C++ (datasketches-cpp). compact_theta_sketch::deserialize() and wrapped_compact_theta_sketch::wrap() read header fields before checking input length; in the compressed format the size check could be defeated by a 32-bit overflow. A crafted or truncated sketch could cause a read past the end of the input, potentially large in the compressed case, leading to a crash and memory exposure. Affects versions from 3.1.0 before 5.3.0.
- CVE-2026-103501Unknown
Heap buffer overflow in the HLL sketch deserialization of Apache DataSketches C++ (datasketches-cpp). When deserializing a sketch in LIST mode, the coupon count was read from input and used as the number of entries to copy into a fixed buffer of 8 entries without checking capacity. A crafted sketch could cause a write of up to 988 bytes past the end of the internal heap buffer, corrupting memory. Affects versions from 1.0.0-incubating before 5.3.0.
Original NVD description (English source)
Out-of-bounds read and write in the CPC sketch deserialization of Apache DataSketches C++ (repo: datasketches-cpp). A crafted serialized CPC sketch passed to cpc_sketch::deserialize(), from either a byte buffer or a stream, can cause the decompressor to read past the end of the compressed data, because the read position was only checked after decoding finished. In the hybrid flavor, it can also cause a write outside an internal heap buffer, because decoded row indices were not validated. Several other header fields and decoded values, including lg_k, were also not validated. This can corrupt heap memory, causing a crash and potentially enabling further exploitation. This issue affects Apache DataSketches C++: from 2.0.0-incubating before 5.3.0. Only applications that deserialize CPC sketches from untrusted sources are affected. Users are recommended to upgrade to version 5.3.0, which fixes this issue.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS