diff --git a/net-mgmt/nagios4/Makefile b/net-mgmt/nagios4/Makefile
index 8e2c87fcf74c..8d89cfeff09a 100644
--- a/net-mgmt/nagios4/Makefile
+++ b/net-mgmt/nagios4/Makefile
@@ -1,107 +1,106 @@
 PORTNAME=	nagios
-DISTVERSION=	4.5.11
-PORTREVISION=	1
+DISTVERSION=	4.5.12
 PORTEPOCH=	1
 CATEGORIES=	net-mgmt
 MASTER_SITES=	https://assets.nagios.com/downloads/nagioscore/releases/ \
 		SF/${PORTNAME}/${PORTNAME}-4.x/${PORTNAME}-${DISTVERSION}
 PKGNAMESUFFIX=	4
 
 MAINTAINER=	hard.egg0918@fastmail.com
 COMMENT=	Powerful network monitoring system
 WWW=		https://www.nagios.org/
 
 LICENSE=	GPLv2
 
 LIB_DEPENDS=	libltdl.so:devel/libltdl \
 		libpng.so:graphics/png \
 		libgd.so:graphics/gd
 
 USES=		cpe dos2unix gmake jpeg localbase perl5 php ssl
 DOS2UNIX_FILES=	contrib/exfoliation/stylesheets/common.css
 USE_PERL5=	build
 USE_RC_SUBR=	${PORTNAME}
 
 NAGIOSUSER?=	${PORTNAME}
 NAGIOSGROUP?=	${PORTNAME}
 NAGIOSDIR?=	/var/spool/${PORTNAME}
 NAGIOSHTMURL?=	/${PORTNAME}
 NAGIOSCGIURL?=	${NAGIOSHTMURL}/cgi-bin
 
 GNU_CONFIGURE=	yes
 CONFIGURE_ARGS=	--with-command-user=${NAGIOSUSER} \
 		--with-command-group=${WWWGRP} \
 		--with-nagios-user=${NAGIOSUSER} \
 		--with-nagios-group=${NAGIOSGROUP} \
 		--with-htmurl=${NAGIOSHTMURL} \
 		--with-cgiurl=${NAGIOSCGIURL} \
 		--with-lockfile=${NAGIOSDIR}/${PORTNAME}.lock \
 		--with-cgibindir=${WWWDIR}/cgi-bin \
 		--with-ssl-inc=${OPENSSLINC} \
 		--with-ssl-lib=${OPENSSLLIB} \
 		--libexecdir=${PREFIX}/libexec/${PORTNAME} \
 		--datadir=${WWWDIR} \
 		--sysconfdir=${ETCDIR} \
 		--localstatedir=${NAGIOSDIR} \
 		--with-httpd-conf=${PREFIX}/etc \
 		--with-checkresult-dir=${NAGIOSDIR}/checkresults \
 		--disable-statuswrl \
 		--enable-event-broker \
 		ac_cv_lib_iconv_main=no
 CONFIGURE_ENV=	PERL=${PERL}
 
 INSTALL_TARGET=	install install-commandmode install-config
 
 CONFLICTS=	${PORTNAME}
 
 .if defined(NAGIOSWWWDIR)
 WWWDIR=	${PREFIX}/${NAGIOSWWWDIR}
 .endif
 SUB_FILES=	pkg-message
 SUB_LIST=	NAGIOSDIR=${NAGIOSDIR} \
 		NAGIOSUSER=${NAGIOSUSER} \
 		NAGIOSGROUP=${NAGIOSGROUP} \
 		NAGIOSHTMURL=${NAGIOSHTMURL} \
 		NAGIOSCGIURL=${NAGIOSCGIURL}
 
 .if ${NAGIOSUSER} == ${PORTNAME}
 USERS=		${NAGIOSUSER}
 .endif
 .if ${NAGIOSGROUP} == ${PORTNAME}
 GROUPS=		${NAGIOSGROUP}
 .endif
 
 PLIST_SUB=	NAGIOSDIR=${NAGIOSDIR} \
 		NAGIOSUSER=${NAGIOSUSER} \
 		NAGIOSGROUP=${NAGIOSGROUP} \
 		WWWGRP=${WWWGRP}
 
 OPTIONS_DEFINE=		NANOSLEEP UNHANDLED_HACK COREWINDOW
 OPTIONS_DEFAULT=	NAGPLUGINS
 OPTIONS_RADIO=		PLUGINS
 OPTIONS_RADIO_PLUGINS=	MONPLUGINS NAGPLUGINS
 
 COREWINDOW_DESC=	Enable the corewindow parameter
 NANOSLEEP_DESC=		Use nanosleep in event timing
 UNHANDLED_HACK_DESC=	Display passive checks in unhandled queries
 
 COREWINDOW_CONFIGURE_ENABLE=	corewindow
 MONPLUGINS_RUN_DEPENDS=		${LOCALBASE}/libexec/${PORTNAME}/check_nagios:net-mgmt/monitoring-plugins
 NAGPLUGINS_RUN_DEPENDS=		${LOCALBASE}/libexec/${PORTNAME}/check_nagios:net-mgmt/nagios-plugins
 NANOSLEEP_CONFIGURE_ENABLE=	nanosleep
 
 post-patch:
 	${REINPLACE_CMD} -e 's/\<77\([0-7]\)\>/75\1/g; s/\<66\([0-7]\)\>/64\1/; /chmod/d; \
 		/\.cfg$$/s/$$/-sample/' \
 		${WRKSRC}/Makefile.in ${WRKSRC}/base/Makefile.in ${WRKSRC}/cgi/Makefile.in \
 		${WRKSRC}/contrib/Makefile.in ${WRKSRC}/html/Makefile.in
 
 post-patch-UNHANDLED_HACK-on:
 	${REINPLACE_CMD} -e 's#;serviceprops=42\&#;serviceprops=10\&#g' -e \
 		's#;hostprops=42\"#;hostprops=10\"#g' ${WRKSRC}/html/side.php
 
 post-install:
 	@${RMDIR} ${STAGEDIR}${PREFIX}/libexec/${PORTNAME}
 	@${MV} ${STAGEDIR}${WWWDIR}/config.inc.php ${STAGEDIR}${WWWDIR}/config.inc.php.sample
 
 .include <bsd.port.mk>
diff --git a/net-mgmt/nagios4/distinfo b/net-mgmt/nagios4/distinfo
index ad19e87bec1b..6bbb3352311a 100644
--- a/net-mgmt/nagios4/distinfo
+++ b/net-mgmt/nagios4/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1768688393
-SHA256 (nagios-4.5.11.tar.gz) = 1bf85d6704a75e6b89a09844836f68b1cfc61ab1ef005574041e36e73fdb797a
-SIZE (nagios-4.5.11.tar.gz) = 2589034
+TIMESTAMP = 1778224993
+SHA256 (nagios-4.5.12.tar.gz) = 9a9fd281ea6ab3d55611efda036ffb9fe76c98423083440900e28012248d5961
+SIZE (nagios-4.5.12.tar.gz) = 2590063
diff --git a/net-mgmt/nagios4/files/patch-html_main.php b/net-mgmt/nagios4/files/patch-html_main.php
index e6bcb2c19347..bffcf1dec638 100644
--- a/net-mgmt/nagios4/files/patch-html_main.php
+++ b/net-mgmt/nagios4/files/patch-html_main.php
@@ -1,40 +1,40 @@
---- html/main.php.orig	2026-01-14 16:37:00 UTC
+--- html/main.php.orig	2026-03-25 14:20:42 UTC
 +++ html/main.php
 @@ -69,37 +69,6 @@ if ($theme != 'dark' && $theme != 'light') {
  
  <body id="splashpage">
  
 -<div id="currentversioninfo">
 -	<div>
 -		<div class="version">Version <b><?php echo $this_version; ?></b></div>
--		<div class="releasedate">January 14, 2026</div>
+-		<div class="releasedate">March 25, 2026</div>
 -	</div>
 -	<div><span id="core-status"></span></div>
 -	<a class="checkforupdates" href="https://www.nagios.org/checkforupdates/?version=<?php echo $this_version; ?>&amp;product=nagioscore" target="_blank">Check for updates</a>
 -</div>
 -
 -
 -<div id="updateversioninfo">
 -<?php
 -	$updateinfo = get_update_information();
 -	if (!$updateinfo['update_checks_enabled']) {
 -?>
 -		<div class="updatechecksdisabled">
 -			<div class="warningmessage">Warning: Automatic Update Checks are Disabled!</div>
 -			<div class="submessage">Disabling update checks presents a possible security risk.  Visit <a href="https://www.nagios.org/" target="_blank">nagios.org</a> to check for updates manually or enable update checks in your Nagios config file.</a></div>
 -		</div>
 -<?php
 -	} else if ($updateinfo['update_available'] && $this_version < $updateinfo['update_version']) {
 -?>
 -		<div class="updateavailable">
 -			<div class="updatemessage">A new version of Nagios Core is available!</div>
 -			<div class="submessage">Visit <a href="https://www.nagios.org/download/" target="_blank">nagios.org</a> to download Nagios <?php echo htmlentities($updateinfo['update_version'], ENT_QUOTES, 'UTF-8');?>.</div>
 -		</div>
 -<?php
 -	}
 -?>
 -</div>
 -
  <div id="mainsplash">
  	<a href="https://www.nagios.org/?utm_campaign=csp&utm_source=nagioscore&utm_medium=splash_thumbnail&utm_content=<?php echo $this_version; ?>" target="_blank"><img src="images/csp-dashboard.avif" /></a>
  	<div id="splashtext">