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Vulnerability record · CVE-2026-35215 · published 17 April 2026

CVE-2026-35215: Firebirdsql firebird divide by zero vulnerability

Firebirdsql · Firebird

Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, the sdl_desc() function does not validate the length of a decoded SDL descriptor from a slice packet. A zero-length descriptor is later used to calculate the number of slice items, causing a division by zero. An unauthenticated attacker can exploit this by sending a crafted slice packet to crash the server. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.

7.5 CVSS 3.1 High EPSS 0.70% · top 48.9% CWE-369 · Divide by zero
7.5CVSS 3.1 base score
0.70%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 1 tagged exploit
17 Jun 2026Last modified by NVD

Description

Firebird is an open-source relational database management system. In versions prior to 5.0.4, 4.0.7 and 3.0.14, the sdl_desc() function does not validate the length of a decoded SDL descriptor from a slice packet. A zero-length descriptor is later used to calculate the number of slice items, causing a division by zero. An unauthenticated attacker can exploit this by sending a crafted slice packet to crash the server. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/FirebirdSQL/firebird/releases/tag/v3.0.14 Release Notes
https://github.com/FirebirdSQL/firebird/releases/tag/v4.0.7 Release Notes
https://github.com/FirebirdSQL/firebird/releases/tag/v5.0.4 Release Notes
https://github.com/FirebirdSQL/firebird/security/advisories/GHSA-g99w-prq5-29c6 ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-35215), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.