CVE-2019-11038: Uninitialized read in gdImageCreateFromXbm

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2019-06-19 · updated 2026-06-17
Weakness: CWE-457

Description

When using the gdImageCreateFromXbm() function in the GD Graphics Library (aka LibGD) 2.2.5, as used in the PHP GD extension in PHP versions 7.1.x below 7.1.30, 7.2.x below 7.2.19 and 7.3.x below 7.3.6, it is possible to supply data that will cause the function to use the value of uninitialized variable. This may lead to disclosing contents of the stack that has been left there by previous code.

Affected products

Canonical Ubuntu Linux: 14.04, 16.04, 18.04, 19.10
Debian Linux: 8.0, 9.0
Fedoraproject Fedora: 29, 30, 32
Libgd: 2.2.5
openSUSE Leap: 15.1
PHP: from 7.1.0 before 7.1.30; from 7.2.0 before 7.2.19; from 7.3.0 before 7.3.6 — fixed in 7.1.30, 7.2.19, 7.3.6
Red Hat Enterprise Linux: 7.0, 8.0
RedHat Software Collections: 1.0
SUSE Linux Enterprise Debuginfo: 11-sp4
SUSE Linux Enterprise Server 15 SP1: 12-sp4
SUSE Linux Enterprise Server: 12-sp4, 12-sp5
SUSE Linux Enterprise Software Development Kit: 12-sp4, 12-sp5
SUSE Linux Enterprise Workstation Extension: 12-sp4, 12-sp5

How to fix

Upgrade to a fixed version: PHP 7.1.30, 7.2.19, 7.3.6. Check the vendor advisory for mitigations.

References

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