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setup_regexp_matches() sizes the buffer used to convert matched substrings back from pg_wchar form at the smaller of maxlen*eml and the original string's byte length, on the assumption that such a conversion cannot produce more bytes than the string it came from. That assumption holds only for validly encoded input. But pg_mb2wchar_with_len() silently accepts bytes that are invalid in the database encoding, turning each such byte into one pg_wchar, and converting that back can take more bytes than the input did. A string made of such bytes therefore overruns the conversion buffer by up to its own length, corrupting the following memory. regexp_match(), regexp_matches(), regexp_split_to_table() and regexp_split_to_array() are all affected. Fix by dropping the tighter bound and always allocating maxlen*eml + 1 bytes. Reported-by: Francesco Verardi <frevadiscor89@gmail.com> Author: Masahiko Sawada <sawada.mshk@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Backpatch-through: 14 Security: CVE-2026-14664
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/.