Firebird: DoS via malicious slice descriptor in slice packet

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Summary

CVECVE-2026-35215
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-17 20:16:35 UTC
Updated2026-04-17 20:16:35 UTC
DescriptionFirebird 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

Problem Types: CWE-369 | CWE-369 CWE-369: Divide By Zero

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA FirebirdSQL Firebird affected >= 3.0.0, < 3.0.14 Not specified
CNA FirebirdSQL Firebird affected >= 4.0.0, < 4.0.7 Not specified
CNA FirebirdSQL Firebird affected >= 5.0.0, < 5.0.4 Not specified

References

ReferenceSourceLinkTags
github.com/FirebirdSQL/firebird/releases/tag/v5.0.4 [email protected] github.com
github.com/FirebirdSQL/firebird/releases/tag/v4.0.7 [email protected] github.com
github.com/FirebirdSQL/firebird/security/advisories/GHSA-g99w-prq5-29c6 [email protected] github.com
github.com/FirebirdSQL/firebird/releases/tag/v3.0.14 [email protected] github.com
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