No exploitation reportedFix available

CVE-2011-2691

Q: Is CVE-2011-2691 actively exploited?

Active exploitation of CVE-2011-2691 has not been confirmed. Its EPSS score was 3.9% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2011-2691?

CVE-2011-2691 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2011-07-17
Fixed in1.5.4 · 1.4.8 · 1.2.45 · 1.0.55
WeaknessCWE-476

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The png_err function in pngerror.c in libpng 1.0.x before 1.0.55, 1.2.x before 1.2.45, 1.4.x before 1.4.8, and 1.5.x before 1.5.4 makes a function call using a NULL pointer argument instead of an empty-string argument, which allows remote attackers to cause a denial of service (application crash) via a crafted PNG image.

Timeline

dates in UTC

2011-07-1720:55CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2011-2691?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2011-2691?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Libpng

Branch	Affected	Fixed in	Source
1.5	≥ 1.5.0, < 1.5.4	1.5.4	NVD
1.4	≥ 1.4.0, < 1.4.8	1.4.8	NVD
1.2	≥ 1.2.0, < 1.2.45	1.2.45	NVD
1.0	≥ 1.0.0, < 1.0.55	1.0.55	NVD

Debian debian linux

Branch	Affected	Fixed in	Source
5.0	= 5.0	no fix published	NVD
6.0	= 6.0	no fix published	NVD

Fedoraproject fedora

Branch	Affected	Fixed in	Source
14.x	= 14	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Libpng to 1.5.4 · 1.4.8 · 1.2.45 · 1.0.55

Advisories and patches

www.libpng.orgVendor Advisory
bugzilla.redhat.comPatch

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.16.5read 2026-10-23
NVDCVSS 2.04.3read 2026-10-23
NVDweakness (CWE)CWE-476read 2026-10-23
FIRST EPSSEPSS score3.9 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Published: 2011-07-17
Last Modified: 2026-06-16
NVD status: Modified

Frequently asked questions

What is CVE-2011-2691?

Is CVE-2011-2691 actively exploited?

Active exploitation of CVE-2011-2691 has not been confirmed. Its EPSS score was 3.9% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2011-2691?

CVE-2011-2691 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

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