diff --git a/.ci/install.sh b/.ci/install.sh
index d065e7ab5..acb84f046 100755
--- a/.ci/install.sh
+++ b/.ci/install.sh
@@ -66,7 +66,7 @@ if [[ $(uname) != CYGWIN* ]]; then
     pushd depends && ./install_raqm.sh && popd
 
     # libavif
-    pushd depends && CMAKE_POLICY_VERSION_MINIMUM=3.5 ./install_libavif.sh && popd
+    pushd depends && ./install_libavif.sh && popd
 
     # extra test images
     pushd depends && ./install_extra_test_images.sh && popd
diff --git a/.github/workflows/wheels-dependencies.sh b/.github/workflows/wheels-dependencies.sh
index ccff94965..60e96b9c2 100755
--- a/.github/workflows/wheels-dependencies.sh
+++ b/.github/workflows/wheels-dependencies.sh
@@ -39,7 +39,7 @@ ARCHIVE_SDIR=pillow-depends-main
 # Package versions for fresh source builds
 FREETYPE_VERSION=2.13.3
 HARFBUZZ_VERSION=11.2.1
-LIBPNG_VERSION=1.6.47
+LIBPNG_VERSION=1.6.48
 JPEGTURBO_VERSION=3.1.0
 OPENJPEG_VERSION=2.5.3
 XZ_VERSION=5.8.1
diff --git a/setup.py b/setup.py
index 5d41e27d9..ab36c6b17 100644
--- a/setup.py
+++ b/setup.py
@@ -224,13 +224,14 @@ def _add_directory(
         path.insert(where, subdir)
 
 
-def _find_include_file(self: pil_build_ext, include: str) -> int:
+def _find_include_file(self: pil_build_ext, include: str) -> str | None:
     for directory in self.compiler.include_dirs:
         _dbg("Checking for include file %s in %s", (include, directory))
-        if os.path.isfile(os.path.join(directory, include)):
+        path = os.path.join(directory, include)
+        if os.path.isfile(path):
             _dbg("Found %s", include)
-            return 1
-    return 0
+            return path
+    return None
 
 
 def _find_library_file(self: pil_build_ext, library: str) -> str | None:
@@ -852,9 +853,13 @@ class pil_build_ext(build_ext):
 
         if feature.want("avif"):
             _dbg("Looking for avif")
-            if _find_include_file(self, "avif/avif.h"):
-                if _find_library_file(self, "avif"):
-                    feature.set("avif", "avif")
+            if avif_h := _find_include_file(self, "avif/avif.h"):
+                with open(avif_h, "rb") as fp:
+                    major_version = int(
+                        fp.read().split(b"#define AVIF_VERSION_MAJOR ")[1].split()[0]
+                    )
+                    if major_version >= 1 and _find_library_file(self, "avif"):
+                        feature.set("avif", "avif")
 
         for f in feature:
             if not feature.get(f) and feature.require(f):
diff --git a/src/PIL/WmfImagePlugin.py b/src/PIL/WmfImagePlugin.py
index f709d026b..d569cb4b8 100644
--- a/src/PIL/WmfImagePlugin.py
+++ b/src/PIL/WmfImagePlugin.py
@@ -81,7 +81,7 @@ class WmfStubImageFile(ImageFile.StubImageFile):
 
     def _open(self) -> None:
         # check placable header
-        s = self.fp.read(80)
+        s = self.fp.read(44)
 
         if s.startswith(b"\xd7\xcd\xc6\x9a\x00\x00"):
             # placeable windows metafile
diff --git a/winbuild/build_prepare.py b/winbuild/build_prepare.py
index e5c52712b..26cc52ec0 100644
--- a/winbuild/build_prepare.py
+++ b/winbuild/build_prepare.py
@@ -121,7 +121,7 @@ V = {
     "LCMS2": "2.17",
     "LIBAVIF": "1.3.0",
     "LIBIMAGEQUANT": "4.3.4",
-    "LIBPNG": "1.6.47",
+    "LIBPNG": "1.6.48",
     "LIBWEBP": "1.5.0",
     "OPENJPEG": "2.5.3",
     "TIFF": "4.7.0",