Medium
Security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2017-7890
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 07:18 UTC · Revision 1
Source evidence
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.
osv:CVE-2017-7890
Complete source record
{
"id": "ae5fa5331cdd222b334d8368ceb2dbbc0c86a51dbad1341b938d625b997e39b5",
"url": "https://osv.dev/vulnerability/CVE-2017-7890",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2017-7890",
"summary": "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.",
"evidence": "osv:CVE-2017-7890",
"products": [],
"severity": "medium",
"structured": {
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"aliases": [
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"metrics": [
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"php-5.6.30RC1",
"POST_PHP7_NSAPI_REMOVAL",
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-7890.json"
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],
"modified": "2026-10-24T10:30:51.385413349Z",
"provider": "osv",
"references": [
"https://www.tenable.com/security/tns-2017-12",
"https://access.redhat.com/errata/RHSA-2018:0406",
"https://access.redhat.com/errata/RHSA-2018:1296",
"https://security.netapp.com/advisory/ntap-20180112-0001/",
"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"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2017-7890",
"evidence": "/id"
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],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 437471,
"published_at": "2017-08-02T19:29:00.897+00:00"
}