PHP, which stands for "PHP: Hypertext Preprocessor" is a widely-used Open
Source general-purpose scripting language that is especially suited for
Web development and can be embedded into HTML. Its syntax draws upon C,
Java, and Perl, and is easy to learn. The main goal of the language is to
allow web developers to write dynamically generated webpages quickly, but
you can do much more with PHP.
SECURITY: session upload progress (CVE-2026-115560, informational)
php.ini-production and php.ini-development now ship with
session.upload_progress.enabled = 0 as a temporary mitigation until the
next regular PHP bugfix release. It only takes effect if you copy one of
these templates to /usr/local/etc/php.ini. Without a php.ini, the
compiled-in default (enabled) applies.
Applications that read $_SESSION["upload_progress_*"] (upload progress
bars) will stop receiving progress data while this is off.
If upgrading
SECURITY: session upload progress (CVE-2026-115560, informational)
Until the next regular PHP bugfix release, session.upload_progress.enabled
should be 0. The shipped php.ini-production and php.ini-development now
set it, but existing php.ini files are never modified on upgrade, and
with no php.ini the compiled-in default (enabled) applies. If you
already applied this setting for CVE-2026-109619 (GHSA-6wmf-4rv5-p3rp),
keep it; nothing further is needed.
The issue needs an unusual combination: session.serialize_handler set
to php_binary or php_serialize in configuration, switched to php at
runtime with ini_set() before session_start(), with upload progress
still enabled. Applications that never change the handler at runtime
can keep the feature enabled.
Check the effective value per SAPI (CLI and FPM/mod_php may load
different ini files):
php -r 'var_dump(ini_get("session.upload_progress.enabled"));'
For FPM/mod_php, use phpinfo() from a web request. Ini files are read
from /usr/local/etc/php.ini and /usr/local/etc/php/*.ini.
Check both halves of the precondition:
php -r 'var_dump(ini_get("session.serialize_handler"));'
grep -rn serialize_handler /usr/local/www /usr/local/etc/php* \
/usr/local/etc/apache2*
A match on one half alone is not vulnerable; the combination is. To
make runtime switching impossible in FPM, set in the pool config:
php_admin_value[session.serialize_handler] = php
This breaks applications that legitimately need php_serialize at runtime.
After changing any setting, restart the PHP service, e.g.:
service php_fpm restart
This notice will be removed once the fixed release is in the tree.
