php: pin the shared interpreter to 8.5.12 for CVE-2026-109618/-109619

PHP 8.5.12, 8.4.27, 8.3.36 and 8.2.35 were released on 2026-10-21 to fix two
critical vulnerabilities in PHP itself:

  CVE-2026-109618  RCE via OOM corruption (GHSA-w8hw-w9fx-j79w)
  CVE-2026-109619  RCE via stale global state (GHSA-6wmf-4rv5-p3rp)

Both are unauthenticated RCE, CVSS v4.0 9.2, and PHP states that updating is
the only complete mitigation.  The advisories name PHP-FPM as susceptible, so
the phpfpm-nextcloud and phpfpm-wordpress pools are in scope, not just the
Apache/mod_php configuration the public write-ups focus on.

nixpkgs bumped php85 in 81513f364091c759812f716cef3c175109d07342 on the same
day, but the revision this flake pins (7694c4f6b853, 2026-10-16) predates it
and still reports php85 8.5.11 — as does the pinned nixos-26.05 rev, so
`pkgs.stable` is not a way out of this either.  Rather than pin the whole
nixpkgs input forward and freeze every other package, pin the interpreter:

  • phpSecurityFloor records the first patched 8.5.x release.
  • phpBase falls through to pkgs.php85 untouched when nixpkgs has caught up,
    so the workaround retires itself; bump the floor only upward.
  • `.override` rather than `overrideAttrs`: php85 is a makeOverridable
    buildEnv, so version/phpSrc reach generic.nix while the default extension
    set survives.  overrideAttrs would keep the new source but drop `enabled`,
    silently removing gd, intl, pdo_pgsql and the rest from both pools.

Nothing else changes: one interpreter, one extension set, one php.ini, and
every consumer (both FPM pools, the Nextcloud cron job, occ and wp-cli) still
resolves through config.sovran_systemsOS.phpPackage, so CLI and FPM stay in
lockstep at 8.5.12.

The source is php-8.5.12.tar.bz2 from php.net, hashed here.  Hydra cannot have
this exact derivation, so the first rebuild compiles PHP plus bz2, apcu, redis,
imagick and memcached locally — a one-off cost, after which it is a store path
like any other and the configuration stays reproducible.

`nixos-rebuild switch` is enough: the phpfpm units change closure and restart,
no reboot and no staged generation required.

CHANGELOG.md

@@ -10,8 +10,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [1.2.2] - 2026-10-21
 
 ### Changed
-- Updated nixpkgs
+- **Nixpkgs Update (`nixpkgs-stable` / `nixos-26.05`):**
-- Updated Sovran_Bitcoin flake for a hot fix for NWC
+  - Updated to commit [`cd4ea8d`](https://github.com/NixOS/nixpkgs/commit/cd4ea8d57de16f4810bc5f14207bac45fbf19f67)
+  - Upgraded **Matrix Synapse**: `1.162.0` → `1.163.0` (automatically picked up by The Hub)
+- **Sovran_Bitcoin Update (`1.1.2`):**
+  - Updated to commit [`63e1049`](https://github.com/naturallaw777/Sovran_Bitcoin/commit/63e104940ef4ff21eb2b43977ca6e110e9c5d524)
+  - Hotfix for Nostr Wallet Connect (NWC): fixes spending on LND 0.21, real internal preimages, and `pay_keysend` support
 
 ### Fixed
 - Make Hub login verification loadable and diagnosable

app/sovran_systemsos_web/versions.json

@@ -9,7 +9,7 @@
   "btcpayserver.service": "2.4.5",
   "albyhub.service": "2.0.0",
   "mempool.service": "3.3.1",
-  "matrix-synapse.service": "1.162.0",
+  "matrix-synapse.service": "1.163.0",
   "livekit.service": "1.13.8",
   "vaultwarden.service": "1.37.4",
   "haven-relay.service": "1.2.2"

modules/php.nix

@@ -18,9 +18,42 @@
 #
 # To fall back to PHP 8.4 (nixpkgs' current default `pkgs.php`) change only
 # the `phpBase` line below.
+#
+# Security floor (October 2026):
+#   CVE-2026-109618 (RCE via OOM corruption) and CVE-2026-109619 (RCE via
+#   stale global state) are critical, unauthenticated flaws in PHP itself,
+#   CVSS v4.0 9.2 each, fixed in 8.5.12 / 8.4.27 / 8.3.36 / 8.2.35 on
+#   2026-10-21.  PHP-FPM is named as susceptible in both advisories, so the
+#   pools below are in scope; updating is the only complete mitigation.
+#   nixpkgs bumped php85 in 81513f364091c759812f716cef3c175109d07342 the same
+#   day, but the nixpkgs revision this flake pins predates it, so the floor is
+#   enforced here.  Once flake.lock is at or past that commit the `else`
+#   branch below stops being taken and can be deleted.
 
 let
-	phpBase = pkgs.php85;
+	# The first 8.5.x release that carries the fixes above.  Bump only upward.
+	phpSecurityFloor = "8.5.12";
+
+	# php-8.5.12.tar.bz2, the same artifact and URL shape nixpkgs' own
+	# generic.nix fetches.  Verified against php.net on 2026-10-23.
+	phpSourceHash = "sha256-/7YO3EN87WO1E35JhNs3moERxQBJxxFRDYuVgnfvwag=";
+
+	# `.override` (not `overrideAttrs`) on purpose: php85 is a `makeOverridable`
+	# buildEnv, so this threads `version`/`phpSrc` into generic.nix while
+	# keeping the default extension set.  `overrideAttrs` would keep the new
+	# source but drop the extension set, which would silently strip gd, intl,
+	# pdo_pgsql and friends out of the pools below.
+	phpBase =
+		if lib.versionAtLeast pkgs.php85.version phpSecurityFloor then
+			pkgs.php85
+		else
+			pkgs.php85.override {
+				version = phpSecurityFloor;
+				phpSrc = pkgs.fetchurl {
+					url = "https://www.php.net/distributions/php-${phpSecurityFloor}.tar.bz2";
+					hash = phpSourceHash;
+				};
+			};
 
 	custom-php = phpBase.buildEnv {
 		# `enabled` is nixpkgs' default extension set.  It already contains every