What’s Vulnerable › Vulnerabilities

CVE-2017-7890

• Severity: medium (CVSS 6.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-08-02 · updated 2026-06-17
• Weakness: CWE-200

Description

The GIF decoding function gdImageCreateFromGifCtx in gd_gif_in.c in the GD Graphics Library (aka libgd), as used in PHP before 5.6.31 and 7.x before 7.1.7, does not zero colorMap arrays before use. A specially crafted GIF image could use the uninitialized tables to read ~700 bytes from the top of the stack, potentially disclosing sensitive information.

Affected products

• PHP: through 5.6.30; 7.0.0, 7.0.1, 7.0.2, 7.0.3, 7.0.4, 7.0.5 (+22)

References

• http://php.net/ChangeLog-5.php
• http://php.net/ChangeLog-7.php
• http://www.debian.org/security/2017/dsa-3938
• http://www.securityfocus.com/bid/99492
• https://access.redhat.com/errata/RHSA-2018:0406
• https://access.redhat.com/errata/RHSA-2018:1296
• https://bugs.php.net/bug.php?id=74435
• https://bugs.php.net/patch-display.php?bug=74435&patch=fix-74435-php-7.0&revision=1497970038
• https://security.netapp.com/advisory/ntap-20180112-0001/
• https://www.tenable.com/security/tns-2017-12
• http://php.net/ChangeLog-5.php
• http://php.net/ChangeLog-7.php

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