CVE-2017-7890

6.5 mediumEPSS 3.4%

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.

Severity

CVSS 3.0

6.5 medium

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

EPSS: 3.4% chance of exploitation in the next 30 days; higher than 88% of CVEs (scores of 2026-10-31)
CWE: CWE-200
Published: 2017-08-02
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

php:php

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

Check your stack JSON