What is CVE-2026-39836?

CVE-2026-39836 is a high-severity vulnerability in Golang Go, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2026-05-07.

How severe is CVE-2026-39836?

High severity. CVSS v3 base score is 7.5 out of 10.

NULL pointer dereference in Golang Go

CVE-2026-39836

The Dial and LookupPort functions panic on Windows when provided with an input containing a NUL (0).

Published 2026-05-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.006 (49.0th percentile), scored 2026-10-22.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: +0.000

Affected products

Golang Go
Go Standard Library Net — versions 0, 1.26.0-0

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

go.dev/issue/79006 (Issue Tracking)
groups.google.com/g/golang-announce/c/qcCIEXso47M (Mailing List, Issue Tracking)
go.dev/cl/775320 (Patch)
pkg.go.dev/vuln/GO-2026-4971 (Vendor Advisory)

Frequently asked questions

What is CVE-2026-39836?: CVE-2026-39836 is a high-severity vulnerability in Golang Go, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2026-05-07.
How severe is CVE-2026-39836?: High severity. CVSS v3 base score is 7.5 out of 10.