CVE-2026-34232— Firebird: DoS via `op_response` packet from client
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I. Basic Information for CVE-2026-34232
Vulnerability Information
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Vulnerability Title
Firebird: DoS via `op_response` packet from client
Source: NVD (National Vulnerability Database)
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 xdr_status_vector() function does not handle the isc_arg_cstring type when decoding an op_response packet, causing a server crash when one is encountered in the status vector. An unauthenticated attacker can exploit this by sending a crafted op_response packet to the server. This issue has been fixed in versions 5.0.4, 4.0.7 and 3.0.14.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
语法无效结构处理不恰当
Source: NVD (National Vulnerability Database)
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xdr_status_vector函数未处理isc_arg_cstring类型，可能导致服务器崩溃。
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-2026-34232
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|---|
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- Release Firebird 4.0.7 · FirebirdSQL/firebird · GitHubx_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-34232
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-2026-35215 | 7.5 HIGH | Firebird: DoS via malicious slice descriptor in slice packet |
| 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
- CVE-2026-40342
Firebird: Path Traversal + Arbitrary File Write Leads to Rem - CVE-2026-35215
Firebird: DoS via malicious slice descriptor in slice packet - CVE-2026-33337
Firebird has a buffer overflow when parsing corrupted slice - CVE-2026-28224
Firebird Null Pointer Dereference via CryptCallback causes D - CVE-2026-28214
Firebird server hangs when using specific clumplet on batch
Same vendor: FirebirdSQL
- CVE-2026-40342
Firebird: Path Traversal + Arbitrary File Write Leads to Rem - CVE-2026-35215
Firebird: DoS via malicious slice descriptor in slice packet - CVE-2026-33337
Firebird has a buffer overflow when parsing corrupted slice - CVE-2026-28224
Firebird Null Pointer Dereference via CryptCallback causes D - CVE-2026-28214
Firebird server hangs when using specific clumplet on batch
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