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CVE-2026-35215— Firebird: DoS via malicious slice descriptor in slice packet

Quick assessment

Affected
FirebirdSQL firebird
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Firebird是Firebird基金会的一套开源跨平台的提供多个ANSI SQL-92功能的关系型数据库管理系统。 Firebird 5.0.4之前版本、4.0.7之前版本和3.0.14之前版本存在安全漏洞，该漏洞源于sdl_desc函数未验证解码的SDL描述符长度，可能导致除零错误，造成服务器崩溃。

CVSS 7.5 · High EPSS 0.47% · P40

Possible ATT&CK Techniques 1 AI

T1498 · Network Denial of Service
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I. Basic Information for CVE-2026-35215

Vulnerability Information
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Vulnerability Title
Firebird: DoS via malicious slice descriptor in slice packet
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
除零错误
Source: CVE Program / CVE List V5
Vulnerability Title
Firebird 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Firebird是Firebird基金会的一套开源跨平台的提供多个ANSI SQL-92功能的关系型数据库管理系统。 Firebird 5.0.4之前版本、4.0.7之前版本和3.0.14之前版本存在安全漏洞，该漏洞源于sdl_desc函数未验证解码的SDL描述符长度，可能导致除零错误，造成服务器崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
FirebirdSQL firebird >= 3.0.0, < 3.0.14 -

II. Public POCs for CVE-2026-35215

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III. Intelligence Information for CVE-2026-35215

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Vendor Pages for CVE-2026-35215 (1)

Same Patch Batch · FirebirdSQL · 2026-04-17 · 9 CVEs total

CVE-2026-40342 10.0 CRITICAL Firebird: Path Traversal + Arbitrary File Write Leads to Remote Code Execution
CVE-2026-27890 8.2 HIGH Firebird has Pre-Auth DOS when Processing Out of Order CNCT_specific_data Segments
CVE-2026-28224 8.2 HIGH Firebird Null Pointer Dereference via CryptCallback causes DOS
CVE-2025-65104 7.9 HIGH Firebird: Information leak vulnerability in firebird3 client when used with newer server
CVE-2026-34232 7.5 HIGH Firebird: DoS via `op_response` packet from client
CVE-2026-28212 7.5 HIGH Firebird has potential server crash via null pointer dereference when processing op_slice
CVE-2026-33337 7.5 HIGH Firebird has a buffer overflow when parsing corrupted slice packets
CVE-2026-28214 Firebird server hangs when using specific clumplet on batch creation

IV. Related Vulnerabilities

Same product: firebird
Same vendor: FirebirdSQL
Same weakness: CWE-369