diff --git a/pkgs/by-name/xe/xen/package.nix b/pkgs/by-name/xe/xen/package.nix
index b6a8ba918951..4c44eddedc39 100644
--- a/pkgs/by-name/xe/xen/package.nix
+++ b/pkgs/by-name/xe/xen/package.nix
@@ -222,6 +222,80 @@ stdenv.mkDerivation (finalAttrs: {
       hash = "sha256-I21YIcaK1v7BfBJi/aiVACgR3QyN+/gXnB4YMprT4zA=";
     })
 
+    # XSA #492
+    (fetchpatch {
+      url = "https://xenbits.xenproject.org/xsa/xsa492/xsa492-4.20-01.patch";
+      hash = "sha256-U3nE7jgTKh2HmS9tMVQG+TIGvgU5B1aikC3NSER0CaY=";
+    })
+    (fetchpatch {
+      url = "https://xenbits.xenproject.org/xsa/xsa492/xsa492-4.20-02.patch";
+      hash = "sha256-Y3k9ICThfnIcu59F2pFDbFWD5DL6siPJmINmC7nT2uY=";
+    })
+    (fetchpatch {
+      url = "https://xenbits.xenproject.org/xsa/xsa492/xsa492-4.20-03.patch";
+      hash = "sha256-k4nPft59/MQwYKcdrzj5d80+LDhp05e86iJWzabjkQc=";
+    })
+    (fetchpatch {
+      url = "https://xenbits.xenproject.org/xsa/xsa492/xsa492-4.20-04.patch";
+      hash = "sha256-Mn+8q9zsstXbmrS/rkDdtwWEiD3EGNlmpa+eB1wESA4=";
+    })
+    (fetchpatch {
+      url = "https://xenbits.xenproject.org/xsa/xsa492/xsa492-4.20-05.patch";
+      hash = "sha256-csf9nf6cz3skhq1ph8HIs2AEVgBkw29hP39zwqy2vwM=";
+    })
+    (fetchpatch {
+      url = "https://xenbits.xenproject.org/xsa/xsa492/xsa492-4.20-06.patch";
+      hash = "sha256-urY9bjqqzKSGqGqEhDnagLUrzDsKkARMERT7vmukeUU=";
+    })
+    (fetchpatch {
+      url = "https://xenbits.xenproject.org/xsa/xsa492/xsa492-4.20-07.patch";
+      hash = "sha256-OyUC9bJevxiMuJuyJO9Z3ScXebe7lZM95HkK5YxGino=";
+    })
+    (fetchpatch {
+      url = "https://xenbits.xenproject.org/xsa/xsa492/xsa492-4.20-08.patch";
+      hash = "sha256-g3zV+r9LKjuMbkl4gprhWqClOgDU/Kbesr39LQiM+Aw=";
+    })
+    (fetchpatch {
+      url = "https://xenbits.xenproject.org/xsa/xsa492/xsa492-4.20-09.patch";
+      hash = "sha256-Wuc5dqwm+zwlYOzDXpRgyQH584sKwETi+xcE7HASHyI=";
+    })
+    (fetchpatch {
+      url = "https://xenbits.xenproject.org/xsa/xsa492/xsa492-4.20-10.patch";
+      hash = "sha256-ggln1O+epVOErBSUhIxX7xhwBy808vnQtcae3KYoQdo=";
+    })
+    (fetchpatch {
+      url = "https://xenbits.xenproject.org/xsa/xsa492/xsa492-4.20-11.patch";
+      hash = "sha256-/Yb1i/ms8MaVsEa/nK84CTFclOKcJoWMjjQJQab7l40=";
+    })
+    (fetchpatch {
+      url = "https://xenbits.xenproject.org/xsa/xsa492/xsa492-4.20-12.patch";
+      hash = "sha256-IpUeM+t7AZ8IVlzake+PiFAe0FCeFzChy+eaN9MAiSM=";
+    })
+    (fetchpatch {
+      url = "https://xenbits.xenproject.org/xsa/xsa492/xsa492-4.20-13.patch";
+      hash = "sha256-3vZj9VrDcFtlKrlMy1OD//F+6O252m23jJ0BRShQ6wA=";
+    })
+    (fetchpatch {
+      url = "https://xenbits.xenproject.org/xsa/xsa492/xsa492-4.20-14.patch";
+      hash = "sha256-LiBavW+FTfXdELs8Fm79KeOvskRqDXytv/e7eYRgSvY=";
+    })
+    (fetchpatch {
+      url = "https://xenbits.xenproject.org/xsa/xsa492/xsa492-4.20-15.patch";
+      hash = "sha256-0eK2hIFPNDIfv2W0ivkGL8Z3F+NpN4p2X0JVKjeBYWE=";
+    })
+    (fetchpatch {
+      url = "https://xenbits.xenproject.org/xsa/xsa492/xsa492-4.20-16.patch";
+      hash = "sha256-iEEkPC9mIuSF6Swt3/myUizsc8DubSPEkLkf1zm0/NE=";
+    })
+    (fetchpatch {
+      url = "https://xenbits.xenproject.org/xsa/xsa492/xsa492-4.20-17.patch";
+      hash = "sha256-YNo1wr+fRKk8+78Jf/zqJ7q9ugbzg7gyiyJ3zU+nB60=";
+    })
+    (fetchpatch {
+      url = "https://xenbits.xenproject.org/xsa/xsa492/xsa492-4.20-18.patch";
+      hash = "sha256-qNWe3iw+bYDtvBZ2KVfcy4VKu/waOyhoKZ0L8bqLdNc=";
+    })
+
     # patch `libxl` to search for `qemu-system-i386` properly. (Before 4.21)
     (fetchpatch {
       url = "https://github.com/xen-project/xen/commit/f6281291704aa356489f4bd927cc7348a920bd01.diff?full_index=1";