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levenshtein() and levenshtein_less_equal() let the caller specify the insertion, deletion, and substitution costs, and fuzzystrmatch's corresponding SQL functions accept any 32-bit integer for each. Since the distances are calculated with 32-bit arithmetic, large costs can cause overflows, thereby producing nonsensical results. Certain inputs to levenshtein_less_equal() can even cause out-of-bounds writes. To fix, use 64-bit arithmetic instead, and error whenever the final result won't fit in the returned 32-bit integer. We may want to teach these functions to reject negative costs, too, but that didn't seem appropriate for a security fix, and therefore it is left as a future exercise. Reported-by: Ben Morris in collaboration with Claude and Anthropic Research Author: Nathan Bossart <nathandbossart@gmail.com> Reviewed-by: Dean Rasheed <dean.a.rasheed@gmail.com> Security: CVE-2026-15742 Backpatch-through: 14
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.