CVE-2026-27890 (GCVE-0-2026-27890)
Vulnerability from cvelistv5
Published
2026-04-17 18:14
Modified
2026-04-17 18:50
Severity ?
VLAI Severity ?
EPSS score ?
CWE
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 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.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| FirebirdSQL | firebird |
Version: >= 3.0.0, < 3.0.14 Version: >= 4.0.0, < 4.0.7 Version: >= 5.0.0, < 5.0.4 |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-27890",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-17T18:50:13.916401Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-17T18:50:22.134Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "firebird",
"vendor": "FirebirdSQL",
"versions": [
{
"status": "affected",
"version": "\u003e= 3.0.0, \u003c 3.0.14"
},
{
"status": "affected",
"version": "\u003e= 4.0.0, \u003c 4.0.7"
},
{
"status": "affected",
"version": "\u003e= 5.0.0, \u003c 5.0.4"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.2,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-119",
"description": "CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-787",
"description": "CWE-787: Out-of-bounds Write",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-17T18:36:11.924Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-6crx-4g37-7j49",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-6crx-4g37-7j49"
},
{
"name": "https://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14"
},
{
"name": "https://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7"
},
{
"name": "https://github.com/FirebirdSQL/firebird/releases/tag/v5.0.4",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/FirebirdSQL/firebird/releases/tag/v5.0.4"
}
],
"source": {
"advisory": "GHSA-6crx-4g37-7j49",
"discovery": "UNKNOWN"
},
"title": "Firebird has Pre-Auth DOS when Processing Out of Order CNCT_specific_data Segments"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-27890",
"datePublished": "2026-04-17T18:14:29.433Z",
"dateReserved": "2026-02-24T15:19:29.716Z",
"dateUpdated": "2026-04-17T18:50:22.134Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-27890\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-04-17T18:50:13.916401Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-04-17T18:50:18.684Z\"}}], \"cna\": {\"title\": \"Firebird has Pre-Auth DOS when Processing Out of Order CNCT_specific_data Segments\", \"source\": {\"advisory\": \"GHSA-6crx-4g37-7j49\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 8.2, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H\", \"integrityImpact\": \"LOW\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"FirebirdSQL\", \"product\": \"firebird\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003e= 3.0.0, \u003c 3.0.14\"}, {\"status\": \"affected\", \"version\": \"\u003e= 4.0.0, \u003c 4.0.7\"}, {\"status\": \"affected\", \"version\": \"\u003e= 5.0.0, \u003c 5.0.4\"}]}], \"references\": [{\"url\": \"https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-6crx-4g37-7j49\", \"name\": \"https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-6crx-4g37-7j49\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14\", \"name\": \"https://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7\", \"name\": \"https://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/FirebirdSQL/firebird/releases/tag/v5.0.4\", \"name\": \"https://github.com/FirebirdSQL/firebird/releases/tag/v5.0.4\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-119\", \"description\": \"CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer\"}]}, {\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-787\", \"description\": \"CWE-787: Out-of-bounds Write\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-04-17T18:36:11.924Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-27890\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-17T18:50:22.134Z\", \"dateReserved\": \"2026-02-24T15:19:29.716Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-04-17T18:14:29.433Z\", \"assignerShortName\": \"GitHub_M\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
Loading…
Loading…