CVE-2015-8540

Publication date 11 December 2015

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Integer underflow in the png_check_keyword function in pngwutil.c in libpng 0.90 through 0.99, 1.0.x before 1.0.66, 1.1.x and 1.2.x before 1.2.56, 1.3.x and 1.4.x before 1.4.19, and 1.5.x before 1.5.26 allows remote attackers to have unspecified impact via a space character as a keyword in a PNG image, which triggers an out-of-bounds read.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
chromium-browser	15.10 wily	Not affected
	15.04 vivid	Not affected
	14.04 LTS trusty	Not in release
	12.04 LTS precise	Not affected
firefox	15.10 wily	Not affected
	15.04 vivid	Not affected
	14.04 LTS trusty	Not in release
	12.04 LTS precise	Not affected
libpng	15.10 wily	Fixed 1.2.51-0ubuntu3.15.10.2
	15.04 vivid	Fixed 1.2.51-0ubuntu3.15.04.2
	14.04 LTS trusty	Fixed 1.2.50-1ubuntu2.14.04.2
	12.04 LTS precise	Fixed 1.2.46-3ubuntu4.2
thunderbird	15.10 wily	Not affected
	15.04 vivid	Not affected
	14.04 LTS trusty	Not in release
	12.04 LTS precise	Not affected

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
libpng	Upstream: http://sourceforge.net/p/libpng/code/ci/d9006f683c641793252d92254a75ae9b815b42ed/ Upstream: 520b373

Severity score breakdown

Parameter	Value
Base score	8.8 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-2861-1
libpng vulnerabilities
6 January 2016