Description
The gdImageScaleTwoPass function in gd_interpolation.c in the GD Graphics Library (aka libgd) before 2.2.0, as used in PHP before 5.6.12, uses inconsistent allocate and free approaches, which allows remote attackers to cause a denial of service (memory consumption) via a crafted call, as demonstrated by a call to the PHP imagescale function.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libgd2 | 2.2.1-1 | — |
| Debian 13 | libgd2 | 2.2.1-1 | — |
| Debian 12 | libgd2 | 2.2.1-1 | — |
| Debian 8 | libgd2 | 2.1.0-5+deb8u3 | DSA-3587-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | libgd2 | 2.1.1-4ubuntu0.16.04.1 | USN-2987-1 |
| Ubuntu 14.04 LTS | libgd2 | 2.1.0-3ubuntu0.1 | USN-2987-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 2 | rh-php56 +2 | 2.3-1.el6 | RHSA-2016:2750 |
| RHEL 2 | rh-php56-php +27 | 5.6.25-1.el6 | RHSA-2016:2750 |
| RHEL 2 | rh-php56-php-pear | 1:1.9.5-4.el6 | RHSA-2016:2750 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP1 | imap | 2007e_suse-19.1 | SUSE-SU-2016:1633-1 |
| SLES 12 SP1 | php5 | 5.5.14-64.5 | SUSE-SU-2016:1633-1 |
| SLES 12 | imap | 2007e_suse-19.1 | SUSE-SU-2016:1633-1 |
| SLES 12 | php5 | 5.5.14-64.5 | SUSE-SU-2016:1633-1 |
Advisories 4
- RHSA-2016:2750 Red Hat Security Advisory: rh-php56 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- USN-2987-1 libgd2 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-3587-1 libgd2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2016:1633-1 Security update for php5 SUSE / openSUSE Security Updates · Feb 4, 2026