CVE-2008-3964

Severity: medium (CVSS 4.3 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2008-09-11 · updated 2026-06-16
Weakness: CWE-193

Description

Multiple off-by-one errors in libpng before 1.2.32beta01, and 1.4 before 1.4.0beta34, allow context-dependent attackers to cause a denial of service (crash) or have unspecified other impact via a PNG image with crafted zTXt chunks, related to (1) the png_push_read_zTXt function in pngread.c, and possibly related to (2) pngtest.c.

Affected products

pnggroup libpng: before 1.2.32; 1.4.0-beta1, 1.4.0-beta10, 1.4.0-beta11, 1.4.0-beta12, 1.4.0-beta13, 1.4.0-beta14 (+27) — fixed in 1.2.32

How to fix

Upgrade to a fixed version: pnggroup libpng 1.2.32. Check the vendor advisory for mitigations.

References

http://secunia.com/advisories/31781
http://secunia.com/advisories/33137
http://secunia.com/advisories/35302
http://secunia.com/advisories/35386
http://security.gentoo.org/glsa/glsa-200812-15.xml
http://sourceforge.net/mailarchive/forum.php?thread_name=e56ccc8f0809180317u6a5306fg14683947affb3e1b%40mail.gmail.com&forum_name=png-mng-implement
http://sourceforge.net/project/shownotes.php?group_id=5624&release_id=624517
http://sourceforge.net/project/shownotes.php?release_id=624518
http://sourceforge.net/tracker/index.php?func=detail&aid=2095669&group_id=5624&atid=105624
http://sunsolve.sun.com/search/document.do?assetkey=1-66-259989-1
http://sunsolve.sun.com/search/document.do?assetkey=1-77-1020521.1-1
http://support.avaya.com/elmodocs2/security/ASA-2009-208.htm

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