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CVE-2026-8606: github enterprise_server Server-Side Request Forgery (SSRF)

CVSS: 7.0v4.0HighAnalyzed
Published 26-05-2026Last modified 27-05-2026
Open JSON

Vulnerability summary

CVE-2026-8606 is a high (CVSS 7.0) Server-Side Request Forgery (SSRF) vulnerability in github enterprise_server. EPSS estimates a 0.70% chance of exploitation in the next 30 days, higher than 52.3% of scored vulnerabilities.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.0/10
010
High · v4.0 (CVE.org)
EPSS score
0.70%
0%100%
Low · +0.21 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 26-05-2026
    PublishedVulnerability first disclosed.
  2. 27-05-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.70%

Chance of exploitation in the next 30 days

Percentile

52%

Versus all other CVEs

30-day change

+0.21 pp

From 0.49% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.70%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Github1 product
  • enterprise_server≥ 3.21.0, < 3.21.1 | ≥ 3.20.0, ≤ 3.20.2 | ≥ 3.19.0, ≤ 3.19.6 | ≥ 3.18.0, ≤ 3.18.9 | ≥ 3.17.0, ≤ 3.17.15 | ≥ 3.16.0, ≤ 3.16.18 | < 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

1 vendor · 1 product

References

6 links