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Vulnerability record · CVE-2017-18365 · published 28 March 2019

CVE-2017-18365: Github deserialization of untrusted data vulnerability

Github · Github

The Management Console in GitHub Enterprise 2.8.x before 2.8.7 has a deserialization issue that allows unauthenticated remote attackers to execute arbitrary code. This occurs because the enterprise session secret is always the same, and can be found in the product's source code. By sending a crafted cookie signed with this secret, one can call Marshal.load with arbitrary data, which is a problem because the Marshal data format allows Ruby objects.

9.8 CVSS 3.0 Critical EPSS 21% · top 2.5% CWE-502 · Deserialization of untrusted data
9.8CVSS 3.0 base score, v2 7.5
21%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

The Management Console in GitHub Enterprise 2.8.x before 2.8.7 has a deserialization issue that allows unauthenticated remote attackers to execute arbitrary code. This occurs because the enterprise session secret is always the same, and can be found in the product's source code. By sending a crafted cookie signed with this secret, one can call Marshal.load with arbitrary data, which is a problem because the Marshal data format allows Ruby objects.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://enterprise.github.com/releases/2.8.7/notes Vendor Advisory
https://www.exablue.de/blog/2017-03-15-github-enterprise-remote-code-execution.html ExploitThird Party Advisory
https://enterprise.github.com/releases/2.8.7/notes Vendor Advisory
https://www.exablue.de/blog/2017-03-15-github-enterprise-remote-code-execution.html ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2017-18365), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.