High
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, when processing CNCT_specific_data segments during authentication, the server assumes segments arrive in strictly ascending order. If segments arrive out of order, the Array class's grow() method computes a negative size value, causing a SIGSEGV crash. An unauthenticated attacker who knows only the server's IP and port can exploit this to crash the server. 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-2026-27890
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:58 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, when processing CNCT_specific_data segments during authentication, the server assumes segments arrive in strictly ascending order. If segments arrive out of order, the Array class's grow() method computes a negative size value, causing a SIGSEGV crash. An unauthenticated attacker who knows only the server's IP and port can exploit this to crash the server. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.
osv:UBUNTU-CVE-2026-27890
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
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"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-27890",
"method": "structured",
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"title": "UBUNTU-CVE-2026-27890",
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{
"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": [
"4.0.6.3221.ds6-2",
"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-2026-27890.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": "2026-10-17T12:59:56.477896313Z",
"provider": "osv",
"upstream": [
"CVE-2026-27890"
],
"references": [
"https://ubuntu.com/security/CVE-2026-27890",
"https://www.cve.org/CVERecord?id=CVE-2026-27890",
"https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-6crx-4g37-7j49"
]
},
"related_cves": [
{
"value": "CVE-2026-27890",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 360007,
"published_at": "2026-04-17T19:16:00+00:00"
}