diff --git a/pkgs/by-name/un/unzip/CVE-2021-4217.patch b/pkgs/by-name/un/unzip/CVE-2021-4217.patch
new file mode 100644
index 0000000000000..9344d1d0cf8dc
--- /dev/null
+++ b/pkgs/by-name/un/unzip/CVE-2021-4217.patch
@@ -0,0 +1,47 @@
+From 731d698377dbd1f5b1b90efeb8094602ed59fc40 Mon Sep 17 00:00:00 2001
+From: Nils Bars <nils.bars@t-online.de>
+Date: Mon, 17 Jan 2022 16:53:16 +0000
+Subject: [PATCH] Fix null pointer dereference and use of uninitialized data
+
+This fixes a bug that causes use of uninitialized heap data if `readbuf` fails
+to read as many bytes as indicated by the extra field length attribute.
+Furthermore, this fixes a null pointer dereference if an archive contains an
+`EF_UNIPATH` extra field but does not have a filename set.
+---
+ fileio.c  | 5 ++++-
+ process.c | 6 +++++-
+ 2 files changed, 9 insertions(+), 2 deletions(-)
+
+--- a/fileio.c
++++ b/fileio.c
+@@ -2310,8 +2310,11 @@ int do_string(__G__ length, option)   /*
+             seek_zipf(__G__ G.cur_zipfile_bufstart - G.extra_bytes +
+                       (G.inptr-G.inbuf) + length);
+         } else {
+-            if (readbuf(__G__ (char *)G.extra_field, length) == 0)
++            unsigned bytes_read = readbuf(__G__ (char *)G.extra_field, length);
++            if (bytes_read == 0)
+                 return PK_EOF;
++            if (bytes_read != length)
++                return PK_ERR;
+             /* Looks like here is where extra fields are read */
+             if (getZip64Data(__G__ G.extra_field, length) != PK_COOL)
+             {
+--- a/process.c
++++ b/process.c
+@@ -2067,10 +2067,14 @@ int getUnicodeData(__G__ ef_buf, ef_len)
+           G.unipath_checksum = makelong(offset + ef_buf);
+           offset += 4;
+ 
++          if (!G.filename_full) {
++            /* Check if we have a unicode extra section but no filename set */
++            return PK_ERR;
++          }
++
+           /*
+            * Compute 32-bit crc
+            */
+-
+           chksum = crc32(chksum, (uch *)(G.filename_full),
+                          strlen(G.filename_full));
+ 
diff --git a/pkgs/by-name/un/unzip/package.nix b/pkgs/by-name/un/unzip/package.nix
index 985daead4d35c..5cc8f41bb05ee 100644
--- a/pkgs/by-name/un/unzip/package.nix
+++ b/pkgs/by-name/un/unzip/package.nix
@@ -57,11 +57,7 @@ stdenv.mkDerivation rec {
     # Clang 16 makes implicit declarations an error by default for C99 and newer, causing the
     # configure script to fail to detect errno and the directory libraries on Darwin.
     ./implicit-declarations-fix.patch
-    (fetchurl {
-      name = "CVE-2021-4217.patch";
-      url = "https://git.launchpad.net/ubuntu/+source/unzip/plain/debian/patches/CVE-2021-4217.patch?id=94a790fcbb5d6c53cdf5d786bcaa0b8dc10309b6";
-      hash = "sha256-YKE4jVNSlrHLbszXNYYRtAQs0ly4AsodEz6tadMIVqE=";
-    })
+    ./CVE-2021-4217.patch
   ]
   ++ lib.optional enableNLS (fetchurl {
     url = "https://gitweb.gentoo.org/repo/gentoo.git/plain/app-arch/unzip/files/unzip-6.0-natspec.patch?id=56bd759df1d0c750a065b8c845e93d5dfa6b549d";