- When downloading compressed content over HTTP and the app as asked libcurl

to automatically uncompress it with the CURLOPT_ENCODING option, libcurl
  could wrongly provide the callback with more data than what the maximum
  documented amount. An application could thus get tricked into badness if the
  maximum limit was trusted to be enforced by libcurl itself (as it is
  documented).

  This is further detailed and explained in the libcurl security advisory
  20100209 at

    http://curl.haxx.se/docs/adv_20100209.html

CHANGES

@@ -6,6 +6,19 @@
 
                                   Changelog
 
+Daniel Stenberg (9 Feb 2010)
+- When downloading compressed content over HTTP and the app as asked libcurl
+  to automatically uncompress it with the CURLOPT_ENCODING option, libcurl
+  could wrongly provide the callback with more data than what the maximum
+  documented amount. An application could thus get tricked into badness if the
+  maximum limit was trusted to be enforced by libcurl itself (as it is
+  documented).
+
+  This is further detailed and explained in the libcurl security advisory
+  20100209 at
+
+    http://curl.haxx.se/docs/adv_20100209.html
+
 Daniel Fandrich (3 Feb 2010)
 - Changed the Watcom makefiles to make them easier to keep in sync with
   Makefile.inc since that can't be included directly.

RELEASE-NOTES

@@ -52,6 +52,8 @@ This release includes the following bugfixes:
  o FTP file size checks with ASCII transfers
  o HTTP Cookie: headers sort cookies based on specified path lengths
  o CURLM_CALL_MULTI_PERFORM fix for multi socket timeout calls
+ o libcurl data callback excessive length:
+   http://curl.haxx.se/docs/adv_20100209.html
 
 This release includes the following known bugs:
 
@@ -66,6 +68,6 @@ advice from friends like these:
  Markus Koetter, Chad Monroe, Martin Storsjo, Siegfried Gyuricsko,
  Jon Nelson, Julien Chaffraix, Renato Botelho, Peter Pentchev, Ingmar Runge,
  Johan van Selst, Charles Kerr, Gil Weber, David McCreedy, Chris Conroy,
- Bjorn Stenberg, Mike Crowe, Joshua Kwan, Daniel Fandrich
+ Bjorn Stenberg, Mike Crowe, Joshua Kwan, Daniel Fandrich, Wesley Miaw
 
         Thanks! (and sorry if I forgot to mention someone)

lib/content_encoding.c

@@ -40,7 +40,7 @@
    (doing so will reduce code size slightly). */
 #define OLD_ZLIB_SUPPORT 1
 
-#define DSIZ 0x10000             /* buffer size for decompressed data */
+#define DSIZ CURL_MAX_WRITE_SIZE /* buffer size for decompressed data */
 
 #define GZIP_MAGIC_0 0x1f
 #define GZIP_MAGIC_1 0x8b