CVE-2026-17556

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.80% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 56.4% of scored records. A rank, not a probability.

NVD base score

8.8 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Analyzed. NVD last modified this record on 2026-08-18.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-08-05 20:05Z2 MO AGO

Last updated

2026-08-06 13:11Z2 MO AGO

Reserved

2026-07-27

Assigning CNA

GitHub_P

Record state

PUBLISHED

Severity

High (CVSS 8.8)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N

Weaknesses

• CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')Base

Data version

5.2

Document digest

949a5b11b7e7091e72a43655d38d531eef8a971c050fc030488b1b309b5d83b3

• docs.github.comhttps://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.19release-notes
• docs.github.comhttps://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.13release-notes
• docs.github.comhttps://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.10release-notes
• docs.github.comhttps://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.6release-notes
• docs.github.comhttps://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.4release-notes