CVE-2026-15996— Denial of service vulnerability in GitHub Enterprise Server allowed unauthenticated service disruption via deeply nested request parameters
Possible ATT&CK Techniques 2AI
T1190 · Exploit Public-Facing Application T1499 · Endpoint Denial of ServiceAffected Version Matrix 4
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| GitHub | Enterprise Server | 3.17.0≤ 3.17.15 | affected |
3.18.0≤ 3.18.9 | affected | ||
3.19.0≤ 3.19.6 | affected | ||
3.20.0≤ 3.20.2 | affected |
Get alerts for future matching vulnerabilitiesLog in to subscribe
I. Basic Information for CVE-2026-15996
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗ Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
Denial of service vulnerability in GitHub Enterprise Server allowed unauthenticated service disruption via deeply nested request parameters
Source: CVE Program / CVE List V5
Vulnerability Description
A denial of service vulnerability was identified in GitHub Enterprise Server that allowed an unauthenticated attacker to cause excessive CPU consumption and exhaust the pool of request-handling worker processes by sending a crafted form-encoded HTTP POST request containing deeply nested parameters. Because request parameters were parsed before routing and authentication, any POST endpoint could be used to trigger the condition, which could render the instance unresponsive. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.3, 3.19.7, 3.18.10, and 3.17.16.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5
Vulnerability Title
GitHub Enterprise Server 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GitHub Enterprise Server是美国GitHub公司的一款企业级服务器操作系统。 GitHub Enterprise Server 3.21之前版本存在资源管理错误漏洞，该漏洞源于在路由和身份验证之前解析请求参数，攻击者通过发送包含深度嵌套参数的特制表单编码HTTP POST请求，导致CPU消耗过高并耗尽请求处理worker进程池，可能使实例无响应。
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 |
|---|---|---|---|---|
| GitHub | Enterprise Server | 3.17.0 ~ 3.17.15 | - |
II. Public POCs for CVE-2026-15996
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-15996
请登录查看更多情报信息。
IV. Related Vulnerabilities
Same product: Enterprise Server
- CVE-2026-17556
Path traversal in GitHub Enterprise Server allowed unauthent - CVE-2026-15783
Missing Authorization vulnerability was identified in GitHub - CVE-2026-15343
Path traversal vulnerability in GitHub Enterprise Server all - CVE-2026-15007
Denial of service vulnerability in GitHub Enterprise Server - CVE-2026-14340
An incorrect authorization vulnerability in GitHub Enterpris
Same vendor: GitHub
- CVE-2026-17556
Path traversal in GitHub Enterprise Server allowed unauthent - CVE-2026-47427
GitHub MCP Server: Nil Pointer Dereference DoS in completion - CVE-2026-54163
secure_headers: CSP directive injection via sandbox, plugin_ - CVE-2026-15783
Missing Authorization vulnerability was identified in GitHub - CVE-2026-15343
Path traversal vulnerability in GitHub Enterprise Server all
Same weakness: CWE-674
- CVE-2026-32327
Apache Portable Runtime Utility: apr-util XML stack recursio - CVE-2026-61483
Apache Lucy: QueryParser unbounded recursion on deeply-neste - CVE-2026-67590
Apache Qpid ProtonJ2: Unbounded type nesting can lead to pre - CVE-2026-67552
Apache Qpid Proton Dotnet: Unbounded type nesting can lead t - CVE-2026-68073
Apache Qpid Broker-J: Unbounded type nesting can lead to pre
V. Comments for CVE-2026-15996
No comments yet