Firebird Vulnerability: Unauthenticated Crash via Crafted Packet
The National Vulnerability Database has detailed CVE-2026-34232, a critical vulnerability in Firebird, the open-source relational database management system. This flaw, present in versions prior to 5.0.4, 4.0.7, and 3.0.14, stems from improper handling of the isc_arg_cstring type within the xdr_status_vector() function when decoding an op_response packet.
An unauthenticated attacker can exploit this by sending a specially crafted op_response packet to the server. The malformed packet, when encountered in the status vector, causes the Firebird server to crash, leading to a denial-of-service condition. The National Vulnerability Database assigns this a CVSS score of 7.5 (HIGH), underscoring its significant impact on availability.
This isn’t a speculative threat; it’s a direct path to service disruption. The fix is straightforward: upgrade to Firebird versions 5.0.4, 4.0.7, or 3.0.14 immediately. If you’re running Firebird, this should be at the top of your patching priorities.
What This Means For You
- If your organization uses Firebird, you are exposed to a denial-of-service attack that an unauthenticated attacker can easily trigger. Check your Firebird deployments immediately and ensure they are patched to versions 5.0.4, 4.0.7, or 3.0.14 to mitigate CVE-2026-34232.
Related ATT&CK Techniques
🛡️ Detection Rules
1 rules · 6 SIEM formats1 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-34232 - Firebird Unauthenticated Server Crash via Crafted Packet
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-34232 | Vulnerability | CVE-2026-34232 |
| CVE-2026-34232 | Affected Product | versions |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 17, 2026 at 23:16 UTC |
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