CVE-2026-77987

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

Not scored by EPSS

EPSS percentile

Not scored by EPSS

NVD base score

The NVD has published no score for this record

NVD CVSS vector

No NVD score to derive

NVD analysis status

Not recorded

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

2026-09-22 20:43Z1 HR AGO

Last updated

2026-09-22 20:43Z1 HR AGO

Reserved

2026-08-21

Assigning CNA

GitHub_P

Record state

PUBLISHED

Severity

Critical (CVSS 9.3)

CNA CVSS vector

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

Weaknesses

• CWE-208Observable Timing DiscrepancyBase
• CWE-918Server-Side Request Forgery (SSRF)Base

Data version

5.2

Document digest

891a6ff36fe456736c89887031359ebb3f7ed68d1000ba268696aed9dd32a7d5

• docs.github.comhttps://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.21release-notes
• docs.github.comhttps://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.15release-notes
• docs.github.comhttps://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.12release-notes
• docs.github.comhttps://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.8release-notes
• docs.github.comhttps://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.6release-notes
• docs.github.comhttps://docs.github.com/en/enterprise-server@3.22/admin/release-notes#3.22.1release-notes