CVE-2009-0749

Use-after-free vulnerability in the GIFReadNextExtension function in lib/pngxtern/gif/gifread.c in OptiPNG 0.6.2 and earlier allows context-dependent attackers to cause a denial of service (application crash) via a crafted GIF image that causes the realloc function to return a new pointer, which triggers memory corruption when the old pointer is accessed.

Published: 2009-03-02 Last update: 2026-04-23 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2009-0749 is rated Moderate Risk (52.5/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.41%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2009-0749

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-05-28 0.19% 0.41% +0.21%
2 2025-03-30 0.33% 0.19% -0.14%
3 2025-03-29 — 0.33% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2009-0749

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 [email protected]
9.3 2.0 HIGH
AV:N/AC:M/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.6 10.0 [email protected]

Weakness enumeration for CVE-2009-0749

OS Trackers for CVE-2009-0749

vendor priority summary link
debian low CVE-2009-0749 low priority: Debian including 1 source packages (optipng), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2009-0749
gentoo normal CVE-2009-0749: 1 GLSA(s) (200903-12), 1 atom(s) (media-gfx/optipng); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2009-0749
redhat — — https://access.redhat.com/security/cve/CVE-2009-0749
ubuntu low CVE-2009-0749 low priority: Ubuntu including 1 source packages (optipng), 11 status rows across 11 suites (dapper, gutsy, hardy, intrepid, jaunty, karmic, lucid, maverick, natty, oneiric, upstream): not-affected 6, ignored 3, DNE 1, released 1. https://ubuntu.com/security/CVE-2009-0749

Affected software / configurations for CVE-2009-0749

Vendor Product Version Raw CPE
optipng_project optipng <= 0.6.2 cpe:2.3:a:optipng_project:optipng:*:*:*:*:*:*:*:*
opensuse opensuse >= 10.3, <= 11.1 cpe:2.3:o:opensuse:opensuse:*:*:*:*:*:*:*:*
suse linux_enterprise 9-11 cpe:2.3:o:suse:linux_enterprise:9-11:*:*:*:*:*:*:*

References for CVE-2009-0749

URL Tags
http://lists.opensuse.org/opensuse-security-announce/2009-03/msg00001.html Mailing List
http://lists.opensuse.org/opensuse-security-announce/2009-07/msg00002.html Mailing List
http://optipng.sourceforge.net Product
http://secunia.com/advisories/34035 Broken Link Vendor Advisory
http://secunia.com/advisories/34201 Broken Link
http://secunia.com/advisories/34259 Broken Link
http://secunia.com/advisories/35685 Broken Link
http://sourceforge.net/tracker/index.php?func=detail&aid=2582013&group_id=151404&atid=780913 Issue Tracking
http://www.gentoo.org/security/en/glsa/glsa-200903-12.xml Third Party Advisory
http://www.openwall.com/lists/oss-security/2009/02/24/2 Mailing List
http://www.openwall.com/lists/oss-security/2009/02/25/4 Mailing List
http://www.securityfocus.com/bid/33873 Broken Link Patch Third Party Advisory VDB Entry
http://www.vupen.com/english/advisories/2009/0510 Broken Link Patch Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/48879 Third Party Advisory VDB Entry
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