TI-2026-22549 Aliases CVE-2026-28214

Firebird server hangs when using specific clumplet on batch creation

LOW 29CWE-190Published 2026-04-17 · Updated 2026-04-20

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: Present
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-190 and the CVSS impact.

Summary

Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, the ClumpletReader::getClumpletSize() function can overflow the totalLength value when parsing a Wide type clumplet, causing an infinite loop. An authenticated user with INSERT privileges on any table can exploit this via a crafted Batch Parameter Block to cause a denial of service against the server. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.01133 66th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed firebird (FirebirdSQL): 3.0.14, 4.0.7, 5.0.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
FirebirdSQL	firebird	3.0.0 to before 3.0.14; 4.0.0 to before 4.0.7; 5.0.0 to before 5.0.4	3.0.14, 4.0.7, 5.0.4	Patch available	CNA

firebird VendorFirebirdSQL Affected 3.0.0 to before 3.0.14; 4.0.0 to before 4.0.7; 5.0.0 to before 5.0.4 Fixed in 3.0.14, 4.0.7, 5.0.4 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:firebirdsql:firebird::::::::	before 3.0.14; 4.0.0 to before 4.0.7; 5.0.0 to before 5.0.4	Vulnerable	FirebirdSQL

cpe:2.3:a:firebirdsql:firebird:*:*:*:*:*:*:*:* Versions before 3.0.14; 4.0.0 to before 4.0.7; 5.0.0 to before 5.0.4 Vulnerable ·FirebirdSQL

Remediation

Fix · CNA firebird (FirebirdSQL) Fixed in 3.0.14, 4.0.7, 5.0.4

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2026-28214
2026-10-25 EPSS moved to the 50th–90th percentile

References

Exploit 1

https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-7cq5-994r-jhrf

Other 3

TI-2026-22559 Firebird Null Pointer Dereference via CryptCallback causes DOS CVSS 3.1HIGH 8.2
TI-2026-22234 Firebird has Pre-Auth DOS when Processing Out of Order CNCT_specific_data Segments CVSS 3.1HIGH 8.2
TI-2026-27368 Firebird: DoS via malicious slice descriptor in slice packet CVSS 3.1HIGH 7.5
TI-2026-26527 Firebird: DoS via `op_response` packet from client CVSS 3.1HIGH 7.5
TI-2026-25747 Firebird has a buffer overflow when parsing corrupted slice packets CVSS 3.1HIGH 7.5
TI-2026-22547 Firebird has potential server crash via null pointer dereference when processing op_slice packet CVSS 3.1HIGH 7.5

See all 45 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences