CVE-2026-8606— Server-Side Request Forgery in GitHub Enterprise Server via Advisory Package URL Endpoint
Possible ATT&CK Techniques 3AI
T1005 · Data from Local System T1530 · Data from Cloud Storage T1598.001 · Spearphishing ServiceAffected Version Matrix 6
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| GitHub | Enterprise Server | 3.21.0< 3.21.1 | affected |
3.20.0≤ 3.20.2 | affected | ||
3.19.0≤ 3.19.6 | affected | ||
3.18.0≤ 3.18.9 | affected | ||
3.17.0≤ 3.17.15 | affected | ||
3.16.0≤ 3.16.18 | affected |
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I. Basic Information for CVE-2026-8606
Vulnerability Information
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Vulnerability Title
Server-Side Request Forgery in GitHub Enterprise Server via Advisory Package URL Endpoint
Source: NVD (National Vulnerability Database)
Vulnerability Description
A Server-Side Request Forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed an attacker to cause the server to issue HTTP requests to internal services via the security advisories package lookup feature. By directing requests to an internal management service and measuring response timing, an attacker could infer the values of sensitive environment variables, including signing secrets and private keys. Exploitation required GitHub Packages to be enabled; on instances not running in private mode the vulnerability was exploitable without authentication, otherwise any authenticated user could exploit it. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21.1 and was fixed in versions 3.20.3, 3.19.7, 3.18.10, 3.17.16, and 3.16.19. This vulnerability was reported via the GitHub Bug Bounty program.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
服务端请求伪造(SSRF)
Source: NVD (National Vulnerability Database)
Vulnerability Title
GitHub Enterprise Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GitHub Enterprise Server是美国GitHub开源的一个应用软件。提供一个将自己的GitHub实例设置为虚拟设备，从而提供可扩展，易于管理的平台。 GitHub Enterprise Server 3.21.1之前版本存在安全漏洞，该漏洞源于安全公告包查找功能存在服务端请求伪造，可能导致攻击者通过响应时间推断敏感环境变量值。
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 | 3.21.0 ~ 3.21.1 | - |
II. Public POCs for CVE-2026-8606
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
Same product: Enterprise Server
- CVE-2026-9312
Server-Side Request Forgery vulnerability in GitHub Enterpri - CVE-2026-8106
Reflected HTML injection vulnerability in GitHub Enterprise - CVE-2026-8034
Server-side request forgery vulnerability in GitHub Enterpri - CVE-2026-7541
Denial of service vulnerability in GitHub Enterprise Server - CVE-2026-6736
Authentication bypass vulnerability in GitHub Enterprise Ser
Same vendor: GitHub
- CVE-2026-9312
Server-Side Request Forgery vulnerability in GitHub Enterpri - CVE-2026-45033
GitHub Copilot CLI: Nested Bare Repository Can Execute Arbit - CVE-2026-8106
Reflected HTML injection vulnerability in GitHub Enterprise - CVE-2026-8034
Server-side request forgery vulnerability in GitHub Enterpri - CVE-2026-7541
Denial of service vulnerability in GitHub Enterprise Server
Same weakness: CWE-918
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