What is CVE-2026-39819?

CVE-2026-39819 is a medium-severity vulnerability in Golang Go, classified under Improper Link Resolution Before File Access. CVSS score: 5.3/10. Published 2026-05-07.

How severe is CVE-2026-39819?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Golang Go

CVE-2026-39819

The "go bug" command writes to two files with predictable names in the system temporary directory (for example, "/tmp"). An attacker with access to the temporary directory can create a symlink in one of these names, causing "go bug" to ove…

EPSS: 0.000 (0.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N.

Affected products

Golang Go
Go Toolchain Cmd/go — versions 0, 1.26.0-0

Weakness classification (CWE)

CWE-59 — Improper Link Resolution Before File Access

References

security@golang.org (Issue Tracking)
security@golang.org (Patch)
security@golang.org (Mailing List, Issue Tracking)
security@golang.org (Vendor Advisory)

Frequently asked questions

What is CVE-2026-39819?: CVE-2026-39819 is a medium-severity vulnerability in Golang Go, classified under Improper Link Resolution Before File Access. CVSS score: 5.3/10. Published 2026-05-07.
How severe is CVE-2026-39819?: Medium severity. CVSS v3 base score is 5.3 out of 10.