Critical
firebird3.0, firebird4.0 — security advisory
Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, the external engine plugin loader concatenates a user-supplied engine name into a filesystem path without filtering path separators or .. components. An authenticated user with CREATE FUNCTION privileges can use a crafted ENGINE name to load an arbitrary shared library from anywhere on the filesystem via path traversal. The library's initialization code executes immediately during loading, before Firebird validates the module, achieving code execution as the server's OS account. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.
- Products
- firebird3.0, firebird4.0
- Affected versions
- 3.0.11.33637.ds4-2ubuntu1, 3.0.11.33637.ds4-2ubuntu2, 3.0.11.33703.ds4-2ubuntu1, 3.0.11.33703.ds4-2ubuntu2, 3.0.12.ds7-12, 3.0.13.ds7-2, 3.0.13.ds7-2build1, 3.0.14.ds7-1, 3.0.2.32703.ds4-11ubuntu1, 3.0.2.32703.ds4-11ubuntu2, 3.0.2.32703.ds4-9, 3.0.5.33100.ds4-3, 3.0.5.33189.ds4-1, 3.0.5.33209.ds4-1, 3.0.5.33220.ds4-1, 3.0.5.33220.ds4-1build1, 3.0.5.33220.ds4-1build2, 3.0.7.33374.ds4-2, 3.0.8.33535.ds4-1ubuntu1, 3.0.8.33535.ds4-1ubuntu2, 4.0.5.3140.ds6-16, 4.0.5.3140.ds6-17, 4.0.6.3221.ds6-2, 4.0.6.3221.ds6-2build1, 4.0.6.3221.ds6-2build2, 4.0.7.3271.ds6-1, 4.0.7.3271.ds6-1build1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-40342
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:43 UTC · Revision 1
Source evidence
Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, the external engine plugin loader concatenates a user-supplied engine name into a filesystem path without filtering path separators or .. components. An authenticated user with CREATE FUNCTION privileges can use a crafted ENGINE name to load an arbitrary shared library from anywhere on the filesystem via path traversal. The library's initialization code executes immediately during loading, before Firebird validates the module, achieving code execution as the server's OS account. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.
osv:UBUNTU-CVE-2026-40342
firebird3.0
Fixed versions: Not specified
firebird3.0
Fixed versions: Not specified
firebird3.0
Fixed versions: Not specified
firebird3.0
Fixed versions: Not specified
firebird3.0
Fixed versions: Not specified
firebird4.0
Fixed versions: Not specified
firebird3.0
Fixed versions: Not specified
firebird4.0
Fixed versions: Not specified
firebird3.0
Fixed versions: Not specified
firebird4.0
Fixed versions: Not specified
Complete source record
{
"id": "05ae24e1ea651297372551848c8e00b786023665af7ff6fcd8c3590f6110471d",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-40342",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-40342",
"summary": "Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, the external engine plugin loader concatenates a user-supplied engine name into a filesystem path without filtering path separators or .. components. An authenticated user with CREATE FUNCTION privileges can use a crafted ENGINE name to load an arbitrary shared library from anywhere on the filesystem via path traversal. The library's initialization code executes immediately during loading, before Firebird validates the module, achieving code execution as the server's OS account. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.",
"evidence": "osv:UBUNTU-CVE-2026-40342",
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},
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{
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"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
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{
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{
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{
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"evidence": "/affected/1/versions"
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{
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{
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{
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"evidence": "/affected/5/package/name"
},
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"fixed_versions": [],
"affected_versions": [
{
"value": "4.0.5.3140.ds6-16",
"evidence": "/affected/5/versions"
},
{
"value": "4.0.5.3140.ds6-17",
"evidence": "/affected/5/versions"
},
{
"value": "4.0.6.3221.ds6-2",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
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"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.0.13.ds7-2build1",
"evidence": "/affected/6/versions"
},
{
"value": "3.0.14.ds7-1",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
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"evidence": "/affected/7/package/name"
},
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"affected_versions": [
{
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"evidence": "/affected/7/versions"
},
{
"value": "4.0.7.3271.ds6-1",
"evidence": "/affected/7/versions"
},
{
"value": "4.0.7.3271.ds6-1build1",
"evidence": "/affected/7/versions"
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]
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{
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{
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"evidence": "/affected/8/versions"
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{
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"evidence": "/affected/8/versions"
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{
"value": "3.0.13.ds7-2build1",
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{
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"evidence": "/affected/9/package/name"
},
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{
"value": "4.0.6.3221.ds6-2",
"evidence": "/affected/9/versions"
},
{
"value": "4.0.6.3221.ds6-2build1",
"evidence": "/affected/9/versions"
},
{
"value": "4.0.6.3221.ds6-2build2",
"evidence": "/affected/9/versions"
}
]
}
],
"severity": "critical",
"structured": {
"id": "UBUNTU-CVE-2026-40342",
"aliases": [
"UBUNTU-CVE-2026-40342"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
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"events": [
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"introduced": "0"
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},
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},
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"4.0.7.3271.ds6-1",
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},
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},
{
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},
{
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"binary_version": "4.0.7.3271.ds6-1build1"
},
{
"binary_name": "firebird4.0-server",
"binary_version": "4.0.7.3271.ds6-1build1"
},
{
"binary_name": "firebird4.0-server-core",
"binary_version": "4.0.7.3271.ds6-1build1"
},
{
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"binary_version": "4.0.7.3271.ds6-1build1"
},
{
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"binary_version": "4.0.7.3271.ds6-1build1"
},
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]
}
},
{
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],
"package": {
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"purl": "pkg:deb/ubuntu/firebird3.0?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"3.0.12.ds7-12",
"3.0.13.ds7-2",
"3.0.13.ds7-2build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40342.json"
},
"ecosystem_specific": {
"binaries": [
{
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},
{
"binary_name": "firebird3.0-examples",
"binary_version": "3.0.13.ds7-2build1"
},
{
"binary_name": "firebird3.0-server",
"binary_version": "3.0.13.ds7-2build1"
},
{
"binary_name": "firebird3.0-server-core",
"binary_version": "3.0.13.ds7-2build1"
},
{
"binary_name": "firebird3.0-utils",
"binary_version": "3.0.13.ds7-2build1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "firebird4.0",
"purl": "pkg:deb/ubuntu/firebird4.0?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
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"4.0.6.3221.ds6-2build1",
"4.0.6.3221.ds6-2build2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40342.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "firebird-utils",
"binary_version": "4.0.6.3221.ds6-2build2"
},
{
"binary_name": "firebird4.0-common",
"binary_version": "4.0.6.3221.ds6-2build2"
},
{
"binary_name": "firebird4.0-examples",
"binary_version": "4.0.6.3221.ds6-2build2"
},
{
"binary_name": "firebird4.0-server",
"binary_version": "4.0.6.3221.ds6-2build2"
},
{
"binary_name": "firebird4.0-server-core",
"binary_version": "4.0.6.3221.ds6-2build2"
},
{
"binary_name": "firebird4.0-utils",
"binary_version": "4.0.6.3221.ds6-2build2"
},
{
"binary_name": "libfbclient2",
"binary_version": "4.0.6.3221.ds6-2build2"
},
{
"binary_name": "libib-util",
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}
]
}
}
],
"modified": "2026-10-17T12:58:53.745726098Z",
"provider": "osv",
"upstream": [
"CVE-2026-40342"
],
"references": [
"https://ubuntu.com/security/CVE-2026-40342",
"https://www.cve.org/CVERecord?id=CVE-2026-40342",
"https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-7pxc-h3rv-r257"
]
},
"related_cves": [
{
"value": "CVE-2026-40342",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 359142,
"published_at": "2026-04-17T20:16:00+00:00"
}