Merge branch 'master' into staging

gnu/packages/ruby.scm

@@ -1582,7 +1582,7 @@ to save time in the following ways:
 (define-public ruby-chunky-png
   (package
     (name "ruby-chunky-png")
-    (version "1.3.12")
+    (version "1.3.14")
     (source
      (origin
        (method git-fetch)
@@ -1591,8 +1591,7 @@ to save time in the following ways:
              (commit (string-append "v" version))))
        (file-name (git-file-name name version))
        (sha256
-        (base32
-         "0hn8ap7iib47qkqdp0awmxgma11z0lmk1ca3lp7c97ykhv7ij1zs"))))
+        (base32 "1m7y11ix38h5a2pj5v81qdmvqh980ql9hp62hk2dxwkwsa4nh22h"))))
     (build-system ruby-build-system)
     (arguments
      `(#:test-target "spec"
@@ -1639,7 +1638,12 @@ pixel, depending on the hardware).
 Performance: ChunkyPNG is reasonably fast for Ruby standards, by only using
 integer math and a highly optimized saving routine.
 @item Interoperability with RMagick.
-@end itemize")
+@end itemize
+
+ChunkyPNG is vulnerable to decompression bombs and can run out of memory when
+loading a specifically crafted PNG file.  This is hard to fix in pure Ruby.
+Deal with untrusted images in a separate process, e.g., by using @code{fork}
+or a background processing library.")
     (home-page "https://github.com/wvanbergen/chunky_png/wiki")
     (license license:expat)))