October 23, 2026

CVE Watchtower

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CVE-2026-8606NVD

Vulnerability Summary

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.
Severity Level
UNKNOWN
Published Date
May 26, 2026
Last Modified
May 27, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
0.39%Probability
Root Weakness (CWE)
CWE-918: Unknown/Unlisted Weakness ↗
Refer to the official MITRE database for detailed architectural specifications regarding this weakness.
CVSS v4.0 Base Metrics — Score 7.0 (HIGH)
Attack VectorNetwork
Attack ComplexityHigh
Attack RequirementsPresent
Privileges RequiredNone
User InteractionNone
Confidentiality (Vulnerable System)Low
Integrity (Vulnerable System)None
Availability (Vulnerable System)None
Confidentiality (Subsequent System)High
Integrity (Subsequent System)High
Availability (Subsequent System)None

Affected & Patched Versions

Affected Versions
  • GitHub Enterprise Server >= 3.21.0 and < 3.21.1
  • GitHub Enterprise Server >= 3.20.0 and <= 3.20.2
  • GitHub Enterprise Server >= 3.19.0 and <= 3.19.6
  • GitHub Enterprise Server >= 3.18.0 and <= 3.18.9
  • GitHub Enterprise Server >= 3.17.0 and <= 3.17.15
  • GitHub Enterprise Server >= 3.16.0 and <= 3.16.18
Patched Versions
  • GitHub Enterprise Server 3.21.1
  • GitHub Enterprise Server 3.20.2
  • GitHub Enterprise Server 3.19.6
  • GitHub Enterprise Server 3.18.9
  • GitHub Enterprise Server 3.17.15
  • GitHub Enterprise Server 3.16.18
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🎁7-Day Free Trial — Try Pro or Team, no card required.
📧Email Delivery — Threat intel straight to your inbox.
♾️Unlimited Vendors — Track your entire stack.
🚨All New CVEs — Be the first to know.
📈EPSS Spike Alerts — Catch rising risk before it peaks.
🎯Custom EPSS/CVSS — Filter noise, focus on risk.
🛡️Exploit Intel — A 2nd confirmed-exploit signal beyond KEV.
🐙GitHub Issues — Auto-tracked, no duplicates.
📬Weekly Digest — One clean summary, not inbox spam.
🏷️Watchlist Groups — Tag alerts by team (Infra/AppSec/SOC).
💬Webhooks — Slack & Teams integration.
🔀Smart Routing — Critical alerts to one channel, rest to another.
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External References