CriticalFix available
php8.4 — security advisory
Attacker-provided inputs to bccomp() could lead to an out-of-bounds write with stack and heap corruption in PHP versions from 8.4.* before 8.4.24 and from 8.5.* before 8.5.9.
- Products
- php8.4
- Affected versions
- 8.4.11-1, 8.4.16-1, 8.4.16-1~deb13u1, 8.4.20-1, 8.4.21-1, 8.4.21-1~deb13u1, 8.4.22-1, 8.4.23-1, 8.4.23-1~deb13u1, 8.4.24-1~deb13u1
- Fixed versions
- 8.4.24-1, 8.4.24-1~deb13u1
- CVEs
- CVE-2026-17544
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 04:06 UTC · Revision 1
Source evidence
Attacker-provided inputs to bccomp() could lead to an out-of-bounds write with stack and heap corruption in PHP versions from 8.4.* before 8.4.24 and from 8.5.* before 8.5.9.
osv:DEBIAN-CVE-2026-17544
php8.4
Fixed versions: 8.4.24-1~deb13u1
php8.4
Fixed versions: 8.4.24-1
Complete source record
{
"id": "824d94a199fa844edd30be31d7857abca500574de282c052f359b42001c1418d",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-17544",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-17544",
"summary": "Attacker-provided inputs to bccomp() could lead to an out-of-bounds write with stack and heap corruption in PHP versions from 8.4.* before 8.4.24 and from 8.5.* before 8.5.9.",
"evidence": "osv:DEBIAN-CVE-2026-17544",
"products": [
{
"name": {
"value": "php8.4",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "8.4.24-1~deb13u1",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "8.4.11-1",
"evidence": "/affected/0/versions"
},
{
"value": "8.4.16-1",
"evidence": "/affected/0/versions"
},
{
"value": "8.4.16-1~deb13u1",
"evidence": "/affected/0/versions"
},
{
"value": "8.4.20-1",
"evidence": "/affected/0/versions"
},
{
"value": "8.4.21-1",
"evidence": "/affected/0/versions"
},
{
"value": "8.4.21-1~deb13u1",
"evidence": "/affected/0/versions"
},
{
"value": "8.4.22-1",
"evidence": "/affected/0/versions"
},
{
"value": "8.4.23-1",
"evidence": "/affected/0/versions"
},
{
"value": "8.4.23-1~deb13u1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "php8.4",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "8.4.24-1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "8.4.11-1",
"evidence": "/affected/1/versions"
},
{
"value": "8.4.16-1",
"evidence": "/affected/1/versions"
},
{
"value": "8.4.16-1~deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "8.4.20-1",
"evidence": "/affected/1/versions"
},
{
"value": "8.4.21-1",
"evidence": "/affected/1/versions"
},
{
"value": "8.4.21-1~deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "8.4.22-1",
"evidence": "/affected/1/versions"
},
{
"value": "8.4.23-1",
"evidence": "/affected/1/versions"
},
{
"value": "8.4.23-1~deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "8.4.24-1~deb13u1",
"evidence": "/affected/1/versions"
}
]
}
],
"severity": "critical",
"structured": {
"id": "DEBIAN-CVE-2026-17544",
"aliases": [
"DEBIAN-CVE-2026-17544"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "8.4.24-1~deb13u1"
}
]
}
],
"package": {
"name": "php8.4",
"purl": "pkg:deb/debian/php8.4?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"8.4.11-1",
"8.4.16-1",
"8.4.16-1~deb13u1",
"8.4.20-1",
"8.4.21-1",
"8.4.21-1~deb13u1",
"8.4.22-1",
"8.4.23-1",
"8.4.23-1~deb13u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-17544.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "8.4.24-1"
}
]
}
],
"package": {
"name": "php8.4",
"purl": "pkg:deb/debian/php8.4?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"8.4.11-1",
"8.4.16-1",
"8.4.16-1~deb13u1",
"8.4.20-1",
"8.4.21-1",
"8.4.21-1~deb13u1",
"8.4.22-1",
"8.4.23-1",
"8.4.23-1~deb13u1",
"8.4.24-1~deb13u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-17544.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-24T09:47:30.037649832Z",
"provider": "osv",
"upstream": [
"CVE-2026-17544"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-17544"
]
},
"related_cves": [
{
"value": "CVE-2026-17544",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 428988,
"published_at": "2026-07-30T12:17:27.347+00:00"
}