CVE-2026-8606 Details
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.
A Server-Side Request Forgery (SSRF) vulnerability has been identified in GitHub Enterprise Server versions prior to 3.21.1. This vulnerability allows an attacker to manipulate the server into making HTTP requests to internal services, exploiting the security advisories package lookup feature. By directing these requests to an internal management service and analyzing response times, an attacker could infer sensitive environment variable values, including signing secrets and private keys. Exploitation was possible without authentication on instances not running in private mode, and required authentication on private mode instances.
Users can upgrade to GitHub Enterprise Server versions 3.20.3, 3.19.7, 3.18.10, 3.17.16, or 3.16.19. Instructions for upgrading can be found in the GitHub Enterprise Server release notes.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 27, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://docs.github.com/en/[email protected]/admin/release-notes#3.16.19 | [email protected] | ProductRelease Notes |
| https://docs.github.com/en/[email protected]/admin/release-notes#3.17.16 | [email protected] | ProductRelease Notes |
| https://docs.github.com/en/[email protected]/admin/release-notes#3.18.10 | [email protected] | ProductRelease Notes |
| https://docs.github.com/en/[email protected]/admin/release-notes#3.19.7 | [email protected] | ProductRelease Notes |
| https://docs.github.com/en/[email protected]/admin/release-notes#3.20.3 | [email protected] | ProductRelease Notes |
| https://docs.github.com/en/[email protected]/admin/release-notes#3.21.1 | [email protected] | ProductRelease Notes |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-918 | Server-Side Request Forgery (SSRF) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| github enterprise server | < 3.16.19 >= 3.17.0, < 3.17.16 >= 3.18.0, < 3.18.10 >= 3.19.0, < 3.19.7 >= 3.20.0, < 3.20.3 3.21.0 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 23, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 1, 2026 | Initial Analysis | [email protected] |
| May 27, 2026 | New CVE Received | [email protected] |