CVE-2026-35215
Description
A flaw was found in Firebird. In the sdl_desc() function, a division by zero vulnerability exists due to improper validation of the length of a decoded SDL descriptor from a slice packet. An unauthenticated attacker can exploit this by sending a specially crafted slice packet, leading to a server crash and resulting in a Denial of Service (DoS).
Statement
Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery. For more information about this vulnerability and the products it affects, please see the linked references.
Mitigation
To mitigate this issue, restrict network access to the Firebird database server to only trusted clients and networks. Configure firewall rules to limit inbound connections to the Firebird service port (default 3050/tcp) from untrusted sources. Alternatively, configure the Firebird server to listen only on localhost or specific trusted network interfaces. Any changes to network configuration or service binding may require a restart of the Firebird service to take effect, which could temporarily interrupt database operations.
Understanding the Weakness (CWE)
Other,Integrity,Availability
Technical Impact: Varies by Context; DoS: Resource Consumption (CPU); Modify Memory; Read Memory
When the quantity is not properly validated, then attackers can specify malicious quantities to cause excessive resource allocation, trigger unexpected failures, enable buffer overflows, etc.
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