fix(php): bake php2shell ini mitigation into cac/cac-fpm/cac-lsphp/cac-litespeed

CVE-2026-109618 / CVE-2026-109619 (GHSA-w8hw-w9fx-j79w, GHSA-6wmf-4rv5-p3rp).
Adds configs/zz-php2shell-mitigation.ini (fatal_error_backtraces=0,
session.upload_progress.enabled=0, max_input_nesting_level=16) and installs it
into each image's PHP scan dir as zz-php2shell-mitigation.ini so it sorts after
99-prod-overrides.ini and the entrypoint-written 99-* fragments:

- Dockerfile / Dockerfile.fpm: COPY to /etc/php.d/ next to prod-php.ini.
- Dockerfile.lsphp / Dockerfile.litespeed: COPY to /etc/lsws-templates/ and
  cp into the computed lsphp $SCAN_DIR in the existing overrides RUN.

fatal_error_backtraces is unknown to (and silently ignored by) PHP < 8.5, so
one file serves every version. Remove once all images ship
PHP >= 8.2.35 / 8.3.36 / 8.4.27 / 8.5.12.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Dockerfile

@@ -41,6 +41,10 @@ RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local
 # Copy configs and web files
 COPY ./configs/default-index.conf /etc/httpd/conf.d/
 COPY ./configs/prod-php.ini /etc/php.ini
+# php2shell mitigation (CVE-2026-109618/-109619). Named zz- so it sorts after
+# every other scan-dir ini (incl. runtime-written 99-*) and wins. Remove once
+# all images ship PHP >= 8.2.35 / 8.3.36 / 8.4.27 / 8.5.12.
+COPY ./configs/zz-php2shell-mitigation.ini /etc/php.d/zz-php2shell-mitigation.ini
 COPY ./configs/phpinfo.php /var/www/html/
 COPY ./configs/mariadb.repo /etc/yum.repos.d/
 COPY ./configs/index.php /var/www/html/

Dockerfile.fpm

@@ -39,6 +39,10 @@ RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local
 
 # Copy configs (PHP only, no Apache configs)
 COPY ./configs/prod-php.ini /etc/php.ini
+# php2shell mitigation (CVE-2026-109618/-109619). Named zz- so it sorts after
+# every other scan-dir ini (incl. runtime-written 99-*) and wins. Remove once
+# all images ship PHP >= 8.2.35 / 8.3.36 / 8.4.27 / 8.5.12.
+COPY ./configs/zz-php2shell-mitigation.ini /etc/php.d/zz-php2shell-mitigation.ini
 COPY ./configs/mariadb.repo /etc/yum.repos.d/
 
 # Set up cron job for log rotation

Dockerfile.litespeed

@@ -83,6 +83,10 @@ COPY ./scripts/entrypoint-litespeed.sh \
      /scripts/
 RUN chmod +x /scripts/*
 COPY ./configs/litespeed/ /etc/lsws-templates/
+## php2shell mitigation (CVE-2026-109618/-109619). Named zz- so it sorts after
+## every other scan-dir ini (incl. runtime-written 99-*) and wins. Remove once
+## all images ship PHP >= 8.2.35 / 8.3.36 / 8.4.27 / 8.5.12.
+COPY ./configs/zz-php2shell-mitigation.ini /etc/lsws-templates/zz-php2shell-mitigation.ini
 
 ## Apply our production lsphp ini overrides. Ask lsphp for its scan dir
 ## directly (varies by PHP minor version: 8.3/8.4/8.5 each have their own
@@ -92,6 +96,7 @@ RUN bash -c 'set -e; \
     SCAN_DIR=$(/usr/local/lsws/lsphp${PHPVER}/bin/lsphp -i 2>/dev/null | awk -F"=> " "/^Scan this dir/ {print \$2; exit}"); \
     mkdir -p "$SCAN_DIR"; \
     cp /etc/lsws-templates/lsphp-overrides.ini "$SCAN_DIR/99-prod-overrides.ini"; \
+    cp /etc/lsws-templates/zz-php2shell-mitigation.ini "$SCAN_DIR/zz-php2shell-mitigation.ini"; \
     echo "wrote overrides to $SCAN_DIR"'
 
 ## Disable the OLS WebAdmin port for customer-facing containers. Bind admin

Dockerfile.lsphp

@@ -201,10 +201,15 @@ RUN chmod +x /scripts/entrypoint-lsphp.sh /scripts/detect-memory-lsphp.sh /scrip
 ## Apply production lsphp ini overrides into lsphp's scan dir (path varies by
 ## PHP minor version; ask lsphp directly — same idiom as Dockerfile.litespeed).
 COPY ./configs/litespeed/lsphp-overrides.ini /etc/lsws-templates/lsphp-overrides.ini
+## php2shell mitigation (CVE-2026-109618/-109619). Named zz- so it sorts after
+## every other scan-dir ini (incl. runtime-written 99-*) and wins. Remove once
+## all images ship PHP >= 8.2.35 / 8.3.36 / 8.4.27 / 8.5.12.
+COPY ./configs/zz-php2shell-mitigation.ini /etc/lsws-templates/zz-php2shell-mitigation.ini
 RUN bash -c 'set -e; \
     SCAN_DIR=$(/usr/local/lsws/lsphp${PHPVER}/bin/lsphp -i 2>/dev/null | awk -F"=> " "/^Scan this dir/ {print \$2; exit}"); \
     mkdir -p "$SCAN_DIR"; \
     cp /etc/lsws-templates/lsphp-overrides.ini "$SCAN_DIR/99-prod-overrides.ini"; \
+    cp /etc/lsws-templates/zz-php2shell-mitigation.ini "$SCAN_DIR/zz-php2shell-mitigation.ini"; \
     echo "wrote overrides to $SCAN_DIR"'
 
 ## Install the cac_path_parity extension into lsphp's own extension_dir and load

configs/zz-php2shell-mitigation.ini

@@ -0,0 +1,5 @@
+; php2shell mitigation (CVE-2026-109618 / CVE-2026-109619, GHSA-w8hw-w9fx-j79w, GHSA-6wmf-4rv5-p3rp)
+; Remove once all images ship PHP >= 8.2.35 / 8.3.36 / 8.4.27 / 8.5.12.
+fatal_error_backtraces = 0
+session.upload_progress.enabled = 0
+max_input_nesting_level = 16

scripts/lsphp-apt-upgrade.sh

@@ -49,11 +49,16 @@ echo "lsphp-apt-upgrade: base image lsphp${PHPVER}=$(dpkg-query -W -f='${Version
 
 # The candidate for lsphpNN must come from the LiteSpeed repo — not "none", and
 # not merely whatever is already installed.
-if ! apt-cache madison "lsphp${PHPVER}" | grep -q 'rpms.litespeedtech.com'; then
+# Read each output into a variable and match in the shell: piping into an
+# early-exit reader (grep -q, awk ... exit) under pipefail can SIGPIPE the writer
+# and report "missing" for a package that is there (scripts/tests/lsphp-info-probe.test.sh).
+MADISON=$(apt-cache madison "lsphp${PHPVER}")
+if [[ "$MADISON" != *rpms.litespeedtech.com* ]]; then
     apt-cache policy "lsphp${PHPVER}" >&2 || true
     die "the LiteSpeed apt repo does not offer lsphp${PHPVER} (repo missing from sources, or its index is empty)."
 fi
-CAND=$(apt-cache policy "lsphp${PHPVER}" | awk '/Candidate:/ {print $2; exit}')
+POLICY=$(apt-cache policy "lsphp${PHPVER}")
+CAND=$(awk '/Candidate:/ {print $2; exit}' <<<"$POLICY")
 echo "lsphp-apt-upgrade: repo candidate lsphp${PHPVER}=${CAND}"
 
 if [ "$OS_UPGRADE" = 1 ]; then