CVE-2026-6409— Denial of Service (DoS) vulnerability exists in the Protobuf PHP library during the parsing of untrusted input
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I. Basic Information for CVE-2026-6409
Vulnerability Information
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Vulnerability Title
Denial of Service (DoS) vulnerability exists in the Protobuf PHP library during the parsing of untrusted input
Source: NVD (National Vulnerability Database)
Vulnerability Description
A Denial of Service (DoS) vulnerability exists in the Protobuf PHP library during the parsing of untrusted input. Maliciously structured messages—specifically those containing negative varints or deep recursion—can be used to crash the application, impacting service availability.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Google protobuf 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google protobuf是美国谷歌（Google）公司的一种数据交换格式。 Google protobuf存在安全漏洞，该漏洞源于解析不可信输入时处理不当，可能导致拒绝服务攻击。
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 |
|---|---|---|---|---|
| Protocol Buffers | Protobuf-php (Pecl) | 0 ~ 5.34.0-RC1 | - |
II. Public POCs for CVE-2026-6409
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
Same weakness: CWE-20
V. Comments for CVE-2026-6409
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