Platform
other
Component
firebird
Fixed in
3.0.1
4.0.1
5.0.1
CVE-2026-34232 describes a Denial of Service (DoS) vulnerability discovered in Firebird, an open-source relational database management system. An attacker can trigger a server crash by sending a specially crafted op_response packet, potentially leading to service disruption and data unavailability. This vulnerability affects Firebird versions 3.0.0 through 5.0.0 (excluding 5.0.4) and 4.0.7. A patch is available in versions 3.0.14, 4.0.7, and 5.0.4.
Successful exploitation of CVE-2026-34232 allows an unauthenticated attacker to cause a Firebird database server to crash. This results in a denial of service, preventing legitimate users from accessing the database and its data. The impact extends beyond simple downtime; data corruption or loss could occur if the crash happens during a critical transaction. While the vulnerability doesn't directly expose sensitive data, the disruption of service can indirectly impact business operations and potentially lead to data breaches if recovery is delayed or compromised. The blast radius is limited to the affected Firebird instance, but in environments with multiple interconnected databases, a cascading failure is possible.
This vulnerability was publicly disclosed on 2026-04-17. No public proof-of-concept (PoC) code has been released at the time of writing, but the vulnerability's nature (easily crafted packet) suggests a high probability of PoC development. It is not currently listed on CISA KEV, and the EPSS score is pending evaluation. Active exploitation campaigns are not currently confirmed, but the ease of exploitation warrants proactive mitigation.
Exploit Status
EPSS
0.06% (17% percentile)
CISA SSVC
CVSS Vector
The primary mitigation for CVE-2026-34232 is to upgrade Firebird to a patched version: 3.0.14, 4.0.7, or 5.0.4. If immediate upgrading is not feasible, consider implementing temporary workarounds. While a direct WAF rule is unlikely to be effective against this specific packet-level vulnerability, strict network segmentation and limiting external access to the Firebird port (3050 by default) can reduce the attack surface. Monitoring Firebird logs for unusual connection patterns or error messages related to op_response packets can provide early warning signs of potential exploitation. After upgrading, confirm the fix by attempting to connect to the database and executing a simple query to ensure normal operation.
Update to version 3.0.14, 4.0.7 or 5.0.4 of Firebird to mitigate the vulnerability. This update corrects the improper handling of op_response packets, thus preventing the potential server crash.
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CVE-2026-34232 is a Denial of Service vulnerability in Firebird database servers, allowing an attacker to crash the server by sending a crafted packet.
You are affected if you are running Firebird versions 3.0.0–>= 5.0.0, < 5.0.4. Upgrade to 3.0.14, 4.0.7, or 5.0.4 to resolve the issue.
Upgrade to Firebird version 3.0.14, 4.0.7, or 5.0.4. If immediate upgrade is not possible, implement network segmentation and monitor logs.
Active exploitation is not currently confirmed, but the vulnerability's ease of exploitation suggests a potential for future attacks.
Refer to the official Firebird security advisory for detailed information and updates: [https://www.firebirdsql.org/security/](https://www.firebirdsql.org/security/)
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