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 deserializing a slice packet, the xdr_datum() function does not validate that a cstring length conforms to the slice descriptor bounds, allowing a cstring longer than the allocated buffer to overflow it. An unauthenticated attacker can exploit this by sending a crafted packet to the server, potentially causing a crash or other security impact. 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-2026-33337
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:59 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 deserializing a slice packet, the xdr_datum() function does not validate that a cstring length conforms to the slice descriptor bounds, allowing a cstring longer than the allocated buffer to overflow it. An unauthenticated attacker can exploit this by sending a crafted packet to the server, potentially causing a crash or other security impact. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.
osv:UBUNTU-CVE-2026-33337
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": "340cd58f0b600f42923bc3ecaa7effc3458560aecdd7b24a0119e0e365cd9141",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-33337",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-33337",
"summary": "Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, when deserializing a slice packet, the xdr_datum() function does not validate that a cstring length conforms to the slice descriptor bounds, allowing a cstring longer than the allocated buffer to overflow it. An unauthenticated attacker can exploit this by sending a crafted packet to the server, potentially causing a crash or other security impact. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.",
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{
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"evidence": "/affected/6/versions"
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"evidence": "/affected/9/versions"
},
{
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"severity": "high",
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"aliases": [
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],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
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"score": "medium"
}
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{
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{
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{
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"ecosystem": "Ubuntu:26.04:LTS"
},
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],
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},
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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": [
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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-2026-33337.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": "2026-10-17T13:00:00.691426854Z",
"provider": "osv",
"upstream": [
"CVE-2026-33337"
],
"references": [
"https://ubuntu.com/security/CVE-2026-33337",
"https://www.cve.org/CVERecord?id=CVE-2026-33337",
"https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-89mq-229g-x47p"
]
},
"related_cves": [
{
"value": "CVE-2026-33337",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 360110,
"published_at": "2026-04-17T19:16:00+00:00"
}