CVE-2026-39833

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 ImpacttotalSuccessful exploitation gives total 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

0.41% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 34.2% of scored records. A rank, not a probability.

NVD base score

9.1 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

NVD analysis status

Modified. NVD last modified this record on 2026-08-11.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

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

2026-05-22 02:31Z3 MO AGO

Last updated

2026-08-11 21:28Z23 DAYS AGO

Reserved

2026-04-07

Assigning CNA

Go

Record state

PUBLISHED

Severity

Critical (CVSS 9.1)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weaknesses

• CWE-862Missing AuthorizationClass
• CWE-358Improperly Implemented Security Check for StandardBase

Data version

5.2

Document digest

e0c1f51167737c96cc78b8649a38ff77871f72323f98d5fb14b19a138df5d046

• go.devhttps://go.dev/issue/79436
• go.devhttps://go.dev/cl/778642
• groups.google.comhttps://groups.google.com/g/golang-announce/c/a082jnz-LvI
• pkg.go.devhttps://pkg.go.dev/vuln/GO-2026-5005