diff --git a/pkgs/development/python-modules/fonttools/default.nix b/pkgs/development/python-modules/fonttools/default.nix
index 3c167debba37..07f60371d96b 100644
--- a/pkgs/development/python-modules/fonttools/default.nix
+++ b/pkgs/development/python-modules/fonttools/default.nix
@@ -4,6 +4,7 @@
 , pythonOlder
 , isPyPy
 , fetchFromGitHub
+, fetchpatch
 , setuptools-scm
 , fs
 , lxml
@@ -36,6 +37,14 @@ buildPythonPackage rec {
     hash = "sha256-fcFFJi9Hr0m74LwFIhhhm/bMfxepAvg4/ymU53MmsPg=";
   };
 
+  patches = [
+    (fetchpatch {
+      name = "CVE-2023-45139.patch";
+      url = "https://github.com/fonttools/fonttools/commit/9f61271dc1ca82ed91f529b130fe5dc5c9bf1f4c.patch";
+      hash = "sha256-29OB21B8S4hGZlvNJnOTYTFAmEii+z5oK6tycoK3PXc=";
+    })
+  ];
+
   nativeBuildInputs = [ setuptools-scm ];
 
   passthru.optional-dependencies = let