Vulnerability Note VU#684412

libpng denial-of-service vulnerability

Original Release date: 25 Feb 2014 | Last revised: 25 Feb 2014


libpng versions 1.6.0 through 1.6.9 contain a denial-of-service vulnerability.


CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop') - CVE-2014-0333

Glenn Randers Pehrson of the PNG Development Group reports:

The progressive decoder in libpng16 enters an infinite loop, thus hanging the application, when it encounters a zero-length IDAT chunk. Only libpng-1.6.0 and later are affected, and only applications using the progressive reader...The loop consumes CPU time but no memory or other resources.


Decoding a malformed .png file may cause the target application to become unresponsive.


Apply an Update
The PNG Development Group has released a patch to address this issue for libpng versions 1.6.0 through 1.6.9. The patch can be found at both and the libpng Sourceforge project.

Vendor Information (Learn More)

VendorStatusDate NotifiedDate Updated
libpngAffected-25 Feb 2014
If you are a vendor and your product is affected, let us know.

CVSS Metrics (Learn More)

Group Score Vector
Base 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P
Temporal 3.6 E:F/RL:OF/RC:C
Environmental 3.6 CDP:N/TD:H/CR:ND/IR:ND/AR:ND



Thanks to Glenn Randers-Pehrson for reporting this vulnerability.

This document was written by Todd Lewellen.

Other Information

  • CVE IDs: CVE-2014-0333
  • Date Public: 25 Feb 2014
  • Date First Published: 25 Feb 2014
  • Date Last Updated: 25 Feb 2014
  • Document Revision: 4


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