What is CVE-2016-3074?

CVE-2016-3074 is a critical-severity vulnerability in Libgd, classified under Incorrect Conversion between Numeric Types. CVSS score: 9.8/10. Published 2016-04-26.

How severe is CVE-2016-3074?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2016-3074 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Libgd

CVE-2016-3074

Integer signedness error in GD Graphics Library 2.1.1 (aka libgd or libgd2) allows remote attackers to cause a denial of service (crash) or potentially execute arbitrary code via crafted compressed gd2 data, which triggers a heap-based buffer overflow.

Published 2016-04-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.372 (98.5th percentile), scored 2026-09-28.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 98.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.370 · newest: 0.372 · change: +0.003

Affected products

Libgd — versions 2.1.1
PHP
Canonical Ubuntu Linux — versions 12.04, 14.04, 15.10
Debian Linux — versions 7.0, 8.0
Fedoraproject Fedora — versions 23, 24
openSUSE — versions 13.2

Weakness classification (CWE)

CWE-681 — Incorrect Conversion between Numeric Types

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

www.debian.org/security/2016/dsa-3556 (vendor-advisory, Third Party Advisory)
www.exploit-db.com/exploits/39736/ (Exploit, VDB Entry, Third Party Advisory, exploit)
security.gentoo.org/glsa/201611-22 (vendor-advisory, Third Party Advisory)
www.securityfocus.com/bid/87087 (VDB Entry, Third Party Advisory, vdb-entry)
rhn.redhat.com/errata/RHSA-2016-2750.html (vendor-advisory, Third Party Advisory)
seclists.org/fulldisclosure/2016/Apr/72 (mailing-list, Exploit, Mailing List, Third Party Advisory)
www.debian.org/security/2016/dsa-3602 (vendor-advisory, Third Party Advisory)
lists.fedoraproject.org/pipermail/package-announce/2016-May/183724.html (vendor-advisory, Mailing List, Third Party Advisory)
www.securitytracker.com/id/1035659 (VDB Entry, Third Party Advisory, vdb-entry, Broken Link)
security.gentoo.org/glsa/201607-04 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2016-3074?: CVE-2016-3074 is a critical-severity vulnerability in Libgd, classified under Incorrect Conversion between Numeric Types. CVSS score: 9.8/10. Published 2016-04-26.
How severe is CVE-2016-3074?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2016-3074 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.