diff --git a/pkgs/by-name/gp/gpx-viewer/package.nix b/pkgs/by-name/gp/gpx-viewer/package.nix
index 4323b4e91ab5..a9e745ccd49e 100644
--- a/pkgs/by-name/gp/gpx-viewer/package.nix
+++ b/pkgs/by-name/gp/gpx-viewer/package.nix
@@ -9,7 +9,7 @@
   vala,
   pkg-config,
   adwaita-icon-theme,
-  libchamplain,
+  libchamplain_libsoup3,
   gdl,
   wrapGAppsHook3,
 }:
@@ -43,7 +43,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [
     gdl
-    libchamplain
+    libchamplain_libsoup3
     adwaita-icon-theme
     libxml2
   ];
diff --git a/pkgs/by-name/li/libchamplain/package.nix b/pkgs/by-name/li/libchamplain_libsoup3/package.nix
similarity index 91%
rename from pkgs/by-name/li/libchamplain/package.nix
rename to pkgs/by-name/li/libchamplain_libsoup3/package.nix
index 547aa3902c56..0f1449b98c9a 100644
--- a/pkgs/by-name/li/libchamplain/package.nix
+++ b/pkgs/by-name/li/libchamplain_libsoup3/package.nix
@@ -15,10 +15,8 @@
   sqlite,
   gnome,
   clutter-gtk,
-  libsoup_2_4,
   libsoup_3,
   gobject-introspection, # , libmemphis
-  withLibsoup3 ? false,
 }:
 
 stdenv.mkDerivation rec {
@@ -51,7 +49,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [
     sqlite
-    (if withLibsoup3 then libsoup_3 else libsoup_2_4)
+    libsoup_3
   ];
 
   propagatedBuildInputs = [
@@ -64,7 +62,7 @@ stdenv.mkDerivation rec {
   mesonFlags = [
     (lib.mesonBool "gtk_doc" (stdenv.buildPlatform == stdenv.hostPlatform))
     "-Dvapi=true"
-    (lib.mesonBool "libsoup3" withLibsoup3)
+    (lib.mesonBool "libsoup3" true)
   ];
 
   passthru = {
@@ -89,7 +87,7 @@ stdenv.mkDerivation rec {
        OpenCycleMap, OpenAerialMap, and Maps for free.
     '';
 
-    teams = lib.optionals withLibsoup3 [
+    teams = [
       lib.teams.gnome
       lib.teams.pantheon
     ];
diff --git a/pkgs/by-name/li/lifeograph/package.nix b/pkgs/by-name/li/lifeograph/package.nix
index 2e0d441dd900..5542cc8815ce 100644
--- a/pkgs/by-name/li/lifeograph/package.nix
+++ b/pkgs/by-name/li/lifeograph/package.nix
@@ -8,7 +8,7 @@
   wrapGAppsHook4,
   enchant,
   gtkmm4,
-  libchamplain,
+  libchamplain_libsoup3,
   libgcrypt,
   shared-mime-info,
   libshumate,
@@ -37,7 +37,7 @@ stdenv.mkDerivation (finalAttrs: {
     libgcrypt
     enchant
     gtkmm4
-    (libchamplain.override { withLibsoup3 = true; })
+    libchamplain_libsoup3
     libshumate
   ];
 
diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index 6a58d3ed03b2..45ac3ca16a9c 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -1110,6 +1110,7 @@ mapAliases {
   libbpf_1 = throw "'libbpf_1' has been renamed to/replaced by 'libbpf'"; # Converted to throw 2025-10-27
   libbson = throw "'libbson' has been renamed to/replaced by 'mongoc'"; # Converted to throw 2025-10-27
   libcef = throw "'libcef' has been removed, as no packages depend on it"; # Added 2025-11-06
+  libchamplain = throw "'libchamplain' has been removed due to reliance on insecure libsoup 2.4. Consider using 'libchamplain_libsoup3' instead"; # Added 2026-05-29
   libdbiDrivers = warnAlias "'libdbiDrivers' has been renamed to 'libdbi-drivers'" libdbi-drivers; # Added 2026-02-08
   libdbiDriversBase = warnAlias "'libdbiDriversBase' has been renamed to 'libdbi-drivers-base'" libdbi-drivers-base; # Added 2026-02-08
   libdevil = throw "libdevil has been removed, as it was unmaintained in Nixpkgs and upstream since 2017"; # Added 2025-09-16
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 3096b138f82e..77ff703bb4a6 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -6391,8 +6391,6 @@ with pkgs;
     else
       pkgs.libcanberra-gtk2;
 
-  libchamplain_libsoup3 = libchamplain.override { withLibsoup3 = true; };
-
   libchipcard = callPackage ../development/libraries/aqbanking/libchipcard.nix { };
 
   libdbi-drivers-base = libdbi-drivers.override {