diff --git a/Lib/tarfile.py b/Lib/tarfile.py
index 7db3a40c9b33cf..6fa9be0f769bc6 100644
--- a/Lib/tarfile.py
+++ b/Lib/tarfile.py
@@ -1410,6 +1410,12 @@ def _proc_gnulong(self, tarfile):
         next.offset = self.offset
         if self.type == GNUTYPE_LONGNAME:
             next.name = nts(buf, tarfile.encoding, tarfile.errors)
+            # V7 directory detection in frombuf() may have used garbage
+            # name data. Re-apply it with the actual long name.
+            if next.type == DIRTYPE and not next.name.endswith("/"):
+                next.type = AREGTYPE
+            elif next.type == AREGTYPE and next.name.endswith("/"):
+                next.type = DIRTYPE
         elif self.type == GNUTYPE_LONGLINK:
             next.linkname = nts(buf, tarfile.encoding, tarfile.errors)
 
diff --git a/Misc/NEWS.d/next/Library/2025-12-24-15-28-43.gh-issue-141707.8vN2Kp.rst b/Misc/NEWS.d/next/Library/2025-12-24-15-28-43.gh-issue-141707.8vN2Kp.rst
new file mode 100644
index 00000000000000..3dbd2db8497fbb
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-12-24-15-28-43.gh-issue-141707.8vN2Kp.rst
@@ -0,0 +1 @@
+Fix :mod:`tarfile` type corruption when extracting files with GNU long names. Regular files were incorrectly identified as directories if the header's name field ended with '/'.