CVE-2026-39819

MEDIUM

Invoking "go bug" follows symlinks in predictable temporary filenames in cmd/go

Title source: cna

Description

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 overwrite the target of the symlink.

References (4)

Core 4

Core References

https://go.dev/issue/78584

https://go.dev/cl/763882

https://groups.google.com/g/golang-announce/c/qcCIEXso47M

https://pkg.go.dev/vuln/GO-2026-4978

Scores

CVSS v3 5.3

EPSS 0.0001

EPSS Percentile 0.9%

Attack Vector LOCAL

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-59

Status published

Products (3)

Go toolchain/cmd/go < 1.25.10

Go toolchain/cmd/go 1.26.0-0 - 1.26.3

golang/go < 1.25.10

Published May 07, 2026

Tracked Since May 08, 2026