diff --git a/sdk_container/src/third_party/portage-stable/sys-apps/sandbox/Manifest b/sdk_container/src/third_party/portage-stable/sys-apps/sandbox/Manifest
index 98e4743d34..7ab3077e76 100644
--- a/sdk_container/src/third_party/portage-stable/sys-apps/sandbox/Manifest
+++ b/sdk_container/src/third_party/portage-stable/sys-apps/sandbox/Manifest
@@ -2,3 +2,4 @@ DIST sandbox-2.39.tar.xz 462796 BLAKE2B 330c6f896eba6ff2a38eb8a5d1ff9b242d0e42ab
 DIST sandbox-2.40.tar.xz 465824 BLAKE2B 1e7e8b1c69807d493d5ca242d746b07aa669e18f9aab60cbfd7fe66500ac6822f8b9236077c370ec7e580c8c056f2ccc7825017cd015fca4497e967dcb93cc82 SHA512 e734f380943cc573847f48789a6ad724a3a3fe1017cb7e4bffcd75d2f758d85e937511bbc2eccd0224301b56bc0dd38c92fbaf2d268132be4985f5a768593bdc
 DIST sandbox-2.41.tar.xz 468180 BLAKE2B cb00ec8605b9b51ce559a9e9baa68d757e17900abbe9fff890ddbabcc001e47d72a0e7a693104a6594d3d86bc9afebc6945ed3ec101fd67bfe8a855de3ef010f SHA512 ac787ecc61a625717a66fef663f34ddc855c144226f80e1593033f06ccd9dbd526ffbd032a7b142404a0a5a5aea4b813c9258e9c2202c2e9b0574aa35aae3ef8
 DIST sandbox-2.42.tar.xz 468676 BLAKE2B c4a17c9c6c1644bf27565eab8d76b37689f2a1ca2083d30d65deffd76449f69f68dd4d56ebb19236ca3111996c037fa4e1e5d034dc942349b93ba7c4c68f6248 SHA512 05076394cec77a6443ccc9ba31209fac32c57497210b817e71d10ffc75388673de75de8be6a86ee2f798a285e02ed1af8f134a988eceb6824a3e94bd5be4fc62
+DIST sandbox-2.43.tar.xz 468420 BLAKE2B c407f7c853d53297d4b0b64f1f3e0a6a26402c32990d7a02f6b2d5aec2b73716a0bb9a931371b87917a5390fb3f80b739e9d2884aec07aa6a1679c32926872ab SHA512 aff9bcbc0a26d4d0df2a469e1978051b9cdd2ce67786c90f857576ddfce20eefa78bfdf6c611fa3f60f0cb0247398c4cf6e4413fed0e4f2eb3bfe11e8a5b6e3e
diff --git a/sdk_container/src/third_party/portage-stable/sys-apps/sandbox/sandbox-2.9999.ebuild b/sdk_container/src/third_party/portage-stable/sys-apps/sandbox/sandbox-2.43.ebuild
similarity index 98%
rename from sdk_container/src/third_party/portage-stable/sys-apps/sandbox/sandbox-2.9999.ebuild
rename to sdk_container/src/third_party/portage-stable/sys-apps/sandbox/sandbox-2.43.ebuild
index bf0e493e80..42636c70dc 100644
--- a/sdk_container/src/third_party/portage-stable/sys-apps/sandbox/sandbox-2.9999.ebuild
+++ b/sdk_container/src/third_party/portage-stable/sys-apps/sandbox/sandbox-2.43.ebuild
@@ -9,7 +9,6 @@ if [[ ${PV} == *9999 ]]; then
 	inherit autotools git-r3
 	EGIT_REPO_URI="https://anongit.gentoo.org/git/proj/sandbox.git
 		https://github.com/gentoo/sandbox.git"
-	EGIT_BRANCH="stable-2.x"
 else
 	SRC_URI="https://dev.gentoo.org/~floppym/dist/${P}.tar.xz"
 	KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~loong ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86"
diff --git a/sdk_container/src/third_party/portage-stable/sys-apps/sandbox/sandbox-9999.ebuild b/sdk_container/src/third_party/portage-stable/sys-apps/sandbox/sandbox-9999.ebuild
new file mode 100644
index 0000000000..42636c70dc
--- /dev/null
+++ b/sdk_container/src/third_party/portage-stable/sys-apps/sandbox/sandbox-9999.ebuild
@@ -0,0 +1,80 @@
+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI="8"
+
+inherit flag-o-matic multilib-minimal multiprocessing
+
+if [[ ${PV} == *9999 ]]; then
+	inherit autotools git-r3
+	EGIT_REPO_URI="https://anongit.gentoo.org/git/proj/sandbox.git
+		https://github.com/gentoo/sandbox.git"
+else
+	SRC_URI="https://dev.gentoo.org/~floppym/dist/${P}.tar.xz"
+	KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~loong ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86"
+fi
+
+DESCRIPTION="sandbox'd LD_PRELOAD hack"
+HOMEPAGE="https://wiki.gentoo.org/wiki/Project:Sandbox"
+
+LICENSE="GPL-2"
+SLOT="0"
+IUSE="+nnp"
+
+# pax-utils lower bound for bug #265376
+DEPEND=">=app-misc/pax-utils-0.1.19"
+# Avoid folks installing with older file, bug #889046. We still need the
+# >= dep in Portage but this is a safety net if people do partial upgrades.
+RDEPEND="!<sys-apps/file-5.44-r1"
+BDEPEND="app-arch/xz-utils"
+
+has sandbox_death_notice ${EBUILD_DEATH_HOOKS} || EBUILD_DEATH_HOOKS+=" sandbox_death_notice"
+
+sandbox_death_notice() {
+	ewarn "If configure failed with a 'cannot run C compiled programs' error, try this:"
+	ewarn "FEATURES='-sandbox -usersandbox' emerge sandbox"
+}
+
+src_prepare() {
+	default
+
+	if [[ ${PV} == *9999 ]]; then
+		eautoreconf
+	fi
+
+	if ! use nnp ; then
+		sed -i 's:PR_SET_NO_NEW_PRIVS:___disable_nnp_hack:' src/sandbox.c || die
+	fi
+}
+
+src_configure() {
+	# sandbox uses `__asm__ (".symver "...` which does
+	# not play well with gcc's LTO: https://gcc.gnu.org/PR48200
+	filter-lto
+
+	filter-lfs-flags #90228
+
+	multilib-minimal_src_configure
+}
+
+multilib_src_configure() {
+	local ECONF_SOURCE="${S}"
+	econf
+}
+
+multilib_src_test() {
+	# Default sandbox build will run with --jobs set to # cpus.
+	emake check TESTSUITEFLAGS="--jobs=$(makeopts_jobs)"
+}
+
+multilib_src_install_all() {
+	doenvd "${FILESDIR}"/09sandbox
+
+	dodoc AUTHORS ChangeLog* README.md
+}
+
+pkg_postinst() {
+	mkdir -p "${EROOT}"/var/log/sandbox
+	chown root:portage "${EROOT}"/var/log/sandbox
+	chmod 0770 "${EROOT}"/var/log/sandbox
+}