CVE-2026-27890
published 2026-04-17CVE-2026-27890: 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…
PriorityP351high8.2CVSS 3.1
AVNACLPRNUINSUCNILAH
EPSS
0.46%
36.8th percentile
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.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| firebirdsql | firebird | < 3.0.14 | 3.0.14 |
| firebirdsql | firebird | — | — |
| firebirdsql | firebird | — | — |
| firebirdsql | firebird | — | — |
| firebirdsql | firebird | >= 4.0.0 < 4.0.7 | 4.0.7 |
| firebirdsql | firebird | >= 5.0.0 < 5.0.4 | 5.0.4 |
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Bugzilla
CVE-2026-27890 firebird: Firebird: Denial of Service via out-of-order authentication segments [fedora-all]
bugzilla·2026-04-17·CVSS 8.2
CVE-2026-27890 [HIGH] CVE-2026-27890 firebird: Firebird: Denial of Service via out-of-order authentication segments [fedora-all]
CVE-2026-27890 firebird: Firebird: Denial of Service via out-of-order authentication segments [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Bugzilla
CVE-2026-27890 Firebird: Firebird: Denial of Service via out-of-order authentication segments
bugzilla·2026-04-17·CVSS 8.2
CVE-2026-27890 [HIGH] CVE-2026-27890 Firebird: Firebird: Denial of Service via out-of-order authentication segments
CVE-2026-27890 Firebird: Firebird: Denial of Service via out-of-order authentication segments
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.
Bugzilla
CVE-2026-27890 firebird: Firebird: Denial of Service via out-of-order authentication segments [epel-all]
bugzilla·2026-04-17·CVSS 8.2
CVE-2026-27890 [HIGH] CVE-2026-27890 firebird: Firebird: Denial of Service via out-of-order authentication segments [epel-all]
CVE-2026-27890 firebird: Firebird: Denial of Service via out-of-order authentication segments [epel-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
2026-04-17
Published