ubuntu-cve-2026-27890
Vulnerability from osv_ubuntu
Published
2026-04-17 19:16
Modified
2026-05-20 15:26
Summary
Details
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.
Severity
8.2 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "firebird3.0-common",
"binary_version": "3.0.2.32703.ds4-11ubuntu2"
},
{
"binary_name": "firebird3.0-examples",
"binary_version": "3.0.2.32703.ds4-11ubuntu2"
},
{
"binary_name": "firebird3.0-server",
"binary_version": "3.0.2.32703.ds4-11ubuntu2"
},
{
"binary_name": "firebird3.0-server-core",
"binary_version": "3.0.2.32703.ds4-11ubuntu2"
},
{
"binary_name": "firebird3.0-utils",
"binary_version": "3.0.2.32703.ds4-11ubuntu2"
},
{
"binary_name": "libfbclient2",
"binary_version": "3.0.2.32703.ds4-11ubuntu2"
},
{
"binary_name": "libib-util",
"binary_version": "3.0.2.32703.ds4-11ubuntu2"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "firebird3.0",
"purl": "pkg:deb/ubuntu/firebird3.0@3.0.2.32703.ds4-11ubuntu2?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.0.2.32703.ds4-9",
"3.0.2.32703.ds4-11ubuntu1",
"3.0.2.32703.ds4-11ubuntu2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "firebird3.0-common",
"binary_version": "3.0.5.33220.ds4-1build2"
},
{
"binary_name": "firebird3.0-examples",
"binary_version": "3.0.5.33220.ds4-1build2"
},
{
"binary_name": "firebird3.0-server",
"binary_version": "3.0.5.33220.ds4-1build2"
},
{
"binary_name": "firebird3.0-server-core",
"binary_version": "3.0.5.33220.ds4-1build2"
},
{
"binary_name": "firebird3.0-utils",
"binary_version": "3.0.5.33220.ds4-1build2"
},
{
"binary_name": "libfbclient2",
"binary_version": "3.0.5.33220.ds4-1build2"
},
{
"binary_name": "libib-util",
"binary_version": "3.0.5.33220.ds4-1build2"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "firebird3.0",
"purl": "pkg:deb/ubuntu/firebird3.0@3.0.5.33220.ds4-1build2?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "firebird3.0-common",
"binary_version": "3.0.8.33535.ds4-1ubuntu2"
},
{
"binary_name": "firebird3.0-examples",
"binary_version": "3.0.8.33535.ds4-1ubuntu2"
},
{
"binary_name": "firebird3.0-server",
"binary_version": "3.0.8.33535.ds4-1ubuntu2"
},
{
"binary_name": "firebird3.0-server-core",
"binary_version": "3.0.8.33535.ds4-1ubuntu2"
},
{
"binary_name": "firebird3.0-utils",
"binary_version": "3.0.8.33535.ds4-1ubuntu2"
},
{
"binary_name": "libfbclient2",
"binary_version": "3.0.8.33535.ds4-1ubuntu2"
},
{
"binary_name": "libib-util",
"binary_version": "3.0.8.33535.ds4-1ubuntu2"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "firebird3.0",
"purl": "pkg:deb/ubuntu/firebird3.0@3.0.8.33535.ds4-1ubuntu2?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.0.7.33374.ds4-2",
"3.0.8.33535.ds4-1ubuntu1",
"3.0.8.33535.ds4-1ubuntu2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "firebird3.0-common",
"binary_version": "3.0.11.33703.ds4-2ubuntu2"
},
{
"binary_name": "firebird3.0-examples",
"binary_version": "3.0.11.33703.ds4-2ubuntu2"
},
{
"binary_name": "firebird3.0-server",
"binary_version": "3.0.11.33703.ds4-2ubuntu2"
},
{
"binary_name": "firebird3.0-server-core",
"binary_version": "3.0.11.33703.ds4-2ubuntu2"
},
{
"binary_name": "firebird3.0-utils",
"binary_version": "3.0.11.33703.ds4-2ubuntu2"
},
{
"binary_name": "libfbclient2",
"binary_version": "3.0.11.33703.ds4-2ubuntu2"
},
{
"binary_name": "libib-util",
"binary_version": "3.0.11.33703.ds4-2ubuntu2"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "firebird3.0",
"purl": "pkg:deb/ubuntu/firebird3.0@3.0.11.33703.ds4-2ubuntu2?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"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"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "firebird3.0-common",
"binary_version": "3.0.12.ds7-12"
},
{
"binary_name": "firebird3.0-examples",
"binary_version": "3.0.12.ds7-12"
},
{
"binary_name": "firebird3.0-server",
"binary_version": "3.0.12.ds7-12"
},
{
"binary_name": "firebird3.0-server-core",
"binary_version": "3.0.12.ds7-12"
},
{
"binary_name": "firebird3.0-utils",
"binary_version": "3.0.12.ds7-12"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "firebird3.0",
"purl": "pkg:deb/ubuntu/firebird3.0@3.0.12.ds7-12?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.0.12.ds7-12"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "firebird-utils",
"binary_version": "4.0.6.3221.ds6-2"
},
{
"binary_name": "firebird4.0-common",
"binary_version": "4.0.6.3221.ds6-2"
},
{
"binary_name": "firebird4.0-examples",
"binary_version": "4.0.6.3221.ds6-2"
},
{
"binary_name": "firebird4.0-server",
"binary_version": "4.0.6.3221.ds6-2"
},
{
"binary_name": "firebird4.0-server-core",
"binary_version": "4.0.6.3221.ds6-2"
},
{
"binary_name": "firebird4.0-utils",
"binary_version": "4.0.6.3221.ds6-2"
},
{
"binary_name": "libfbclient2",
"binary_version": "4.0.6.3221.ds6-2"
},
{
"binary_name": "libib-util",
"binary_version": "4.0.6.3221.ds6-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "firebird4.0",
"purl": "pkg:deb/ubuntu/firebird4.0@4.0.6.3221.ds6-2?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.0.5.3140.ds6-16",
"4.0.5.3140.ds6-17",
"4.0.6.3221.ds6-2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "firebird3.0-common",
"binary_version": "3.0.13.ds7-2build1"
},
{
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "firebird3.0",
"purl": "pkg:deb/ubuntu/firebird3.0@3.0.13.ds7-2build1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.0.12.ds7-12",
"3.0.13.ds7-2",
"3.0.13.ds7-2build1"
]
},
{
"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",
"binary_version": "4.0.6.3221.ds6-2build2"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "firebird4.0",
"purl": "pkg:deb/ubuntu/firebird4.0@4.0.6.3221.ds6-2build2?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.0.6.3221.ds6-2",
"4.0.6.3221.ds6-2build1",
"4.0.6.3221.ds6-2build2"
]
}
],
"aliases": [],
"details": "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\u0027s grow() method computes a negative size value, causing a SIGSEGV crash. An unauthenticated attacker who knows only the server\u0027s 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.",
"id": "UBUNTU-CVE-2026-27890",
"modified": "2026-05-20T15:26:07Z",
"published": "2026-04-17T19:16:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-27890"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-27890"
},
{
"type": "REPORT",
"url": "https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-6crx-4g37-7j49"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-27890"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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