CVE-2026-28212 FirebirdSQL CVE debrief

Who should care

Defenders responsible for Firebird instances should assess exposure and apply patches to vulnerable versions. This includes operators, platform administrators, vulnerability management teams, and security teams who need to verify exposure, prioritize patching, and monitor for suspicious activity in Firebird instances. They should also review compensating controls and ensure proper monitoring and detection are in place for exposed assets.

Why it matters

CVE-2026-28212 is a high-severity vulnerability in Firebird that can cause a server crash. Defenders should prioritize verifying exposure and applying patches to vulnerable instances.

• Potential server crash and disruption of database services
• Verification of exposure and patching priority for vulnerable Firebird instances
• Monitoring of Firebird instance logs for suspicious activity

Technical summary

The vulnerability occurs when processing an op_slice network packet, causing a null pointer dereference and server crash. An unauthenticated attacker can trigger this by sending a crafted packet to the server port. This issue has been fixed in versions 6.0.0, 5.0.4, 4.0.7, and 3.0.14. The SDL_info() function is affected in Firebird versions prior to 6.0.0, 5.0.4, 4.0.7, and 3.0.14, leading to potential server crashes and disruption of database services if exploited. Defenders should prioritize verifying exposure and applying patches to vulnerable Firebird instances.

Defensive priority

Defenders should prioritize verifying exposure and applying patches to vulnerable Firebird instances.

Recommended defensive actions

• Verify Firebird instance exposure and apply patches to vulnerable versions
• Restrict network access to Firebird instances
• Monitor Firebird instance logs for suspicious activity
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The vulnerability is caused by a null pointer dereference in the SDL_info() function when processing an op_slice network packet. This occurs in Firebird versions prior to 6.0.0, 5.0.4, 4.0.7, and 3.0.14.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.