Is CVE-2026-27890 actively exploited?

CVE-2026-27890 has no public evidence of in-the-wild exploitation as of 2026-04-24.

What is the CVSS score for CVE-2026-27890?

CVE-2026-27890 has a CVSS score of 8.2 (HIGH severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H.

How do I patch CVE-2026-27890?

Patch guidance is available from firebirdsql security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-27890.

Fix CVE-2026-27890 - HIGH firebirdsql firebird

Q: Which products are affected by CVE-2026-27890?

3 products: firebirdsql firebird, firebirdsql firebird, firebirdsql firebird.

Description

Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, when processing CNCT_specific_data segments during authentication, the server assumes segments arrive in strictly ascending order. If segments arrive out of order, the Array class's grow() method computes a negative size value, causing a SIGSEGV crash. An unauthenticated attacker who knows only the server's IP and port can exploit this to crash the server. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: none
Integrity: low
Availability: high
Weaknesses: CWE-119 · Memory Buffer Errors CWE-787 · Out-of-bounds Write

Metadata

Primary Vendor: FIREBIRDSQL
Published: 4/17/2026
Last Modified: 4/24/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

firebirdsql : firebirdfirebirdsql : firebirdfirebirdsql : firebird

Remediation Guidance

Executive Summary

Cite this page

CVE-2026-27890. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2026-27890

View on NIST NVD

CVE-2026-27890 vulnerability