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.
References
| Link | Resource |
|---|---|
| https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.19 | Product Release Notes |
| https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.16 | Product Release Notes |
| https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.10 | Product Release Notes |
| https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.7 | Product Release Notes |
| https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.3 | Product Release Notes |
| https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.1 | Product Release Notes |
Configurations
Configuration 1 (hide)
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History
01 Jun 2026, 18:33
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.9 |
| First Time |
Github enterprise Server
Github |
|
| CPE | cpe:2.3:a:github:enterprise_server:3.21.0:*:*:*:*:*:*:* cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:* |
|
| References | () https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.19 - Product, Release Notes | |
| References | () https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.16 - Product, Release Notes | |
| References | () https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.10 - Product, Release Notes | |
| References | () https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.7 - Product, Release Notes | |
| References | () https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.3 - Product, Release Notes | |
| References | () https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.1 - Product, Release Notes |
27 May 2026, 00:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-05-27 00:16
Updated : 2026-06-01 18:33
NVD link : CVE-2026-8606
Mitre link : CVE-2026-8606
CVE.ORG link : CVE-2026-8606
JSON object : View
Products Affected
github
- enterprise_server
CWE
CWE-918
Server-Side Request Forgery (SSRF)