diff --git a/glibc.spec b/glibc.spec
index 012d4f0..cef56bf 100644
--- a/glibc.spec
+++ b/glibc.spec
@@ -1,6 +1,6 @@
-%define glibcsrcdir glibc-2.26.9000-1145-g21c0696cde
+%define glibcsrcdir glibc-2.26.9000-1217-gcdd14619a7
 %define glibcversion 2.26.9000
-%define glibcrelease 49%{?dist}
+%define glibcrelease 50%{?dist}
 # Pre-release tarballs are pulled in from git using a command that is
 # effectively:
 #
@@ -1992,6 +1992,15 @@ fi
 %endif
 
 %changelog
+* Mon Jan 29 2018 Florian Weimer <fweimer@redhat.com> - 2.26.9000-50
+- Auto-sync with upstream branch master,
+  commit cdd14619a713ab41e26ba700add4880604324dbb:
+- libnsl: Turn remaining symbols into compat symbols (swbz#22701)
+- be_BY, be_BY@latin, lt_LT, el_CY, el_GR, ru_RU, ru_UA, uk_UA:
+  Add alternative month names (swbz#10871)
+- x86: Revert Intel CET changes to __jmp_buf_tag (swbz#22743)
+- aarch64: Revert the change of the __reserved member of mcontext_t
+
 * Mon Jan 29 2018 Igor Gnatenko <ignatenkobrain@fedoraproject.org> - 2.26.9000-49
 - Add file triggers to do ldconfig calls automatically
 
diff --git a/sources b/sources
index 6af1768..a85f5b6 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (glibc-2.26.9000-1145-g21c0696cde.tar.gz) = fa3970e0796aa9c56dbc37b631734bcee43dad4b1e92ac02eff52278618b138bbc4976b96ff0525eb013f78adeff2ec846cc401a969c3b0bd7e2e580f024cd46
+SHA512 (glibc-2.26.9000-1217-gcdd14619a7.tar.gz) = 1670e012b48a13417d540efc3ee141192764e292f4623e305373276f4f9b11c8da6fc22c4d50c922a2527386d8c34b31f4a974cff6849677e647974b709e2c67