Is CVE-2026-8606 actively exploited?

No active exploitation of CVE-2026-8606 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-8606 be exploited remotely?

Yes. CVE-2026-8606 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-8606?

CVE-2026-8606 has a CVSS score of 5.9 (MEDIUM).

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MEDIUM

CVE-2026-8606

CWE-918Published: May 27, 2026· Updated: Jun 1, 2026

5.9

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2026-8606 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 5.9.