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timeofday() assumed that the output of pg_strftime() could not contain % signs, other than the one it explicitly asks for with %%. However, we don't have that guarantee with respect to the time zone name (%Z). A crafted time zone setting could abuse the subsequent snprintf() call, resulting in crashes or disclosure of server memory. To fix, split the pg_strftime() call into two and then treat the outputs as literal strings, not a snprintf format string. The extra pg_strftime() call doesn't really cost anything, since the bulk of the conversion work was done by pg_localtime(). Also, adjust buffer widths so that we're not risking string truncation during the snprintf() step, as that would create a hazard of producing mis-encoded output. This also fixes a latent portability issue: the format string expects an int, but tp.tv_usec is long int on many platforms. Reported-by: Xint Code Author: Tom Lane <tgl@sss.pgh.pa.us> Reviewed-by: John Naylor <johncnaylorls@gmail.com> Backpatch-through: 14 Security: CVE-2026-6474 |
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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/.