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CVE-2026-39819

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

Published: May 7, 2026Updated: May 13, 2026 Sources: CVE List NVD BDUCWE-59

No Known Exploits

Patch Available

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.

CVSS Vector Breakdown

Exploitability

AV:LAttack Vector

Local

AC:HAttack Complexity

High

PR:LPrivileges Required

Low

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:LConfidentiality

Low

I:HIntegrity

High

A:NAvailability

None

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Weaknesses

Affected Products

Go The Go Project OSS Libraries

go golang OSS Libraries

cmd/go Go toolchain

Library

OSS Libraries / go

the go projectoss-projectOSS Librariesaka go, golang-google-protobuf, crypto

golangoss-projectUSOSS Libraries

go toolchainoss-projectUSOSS Librariesaka golang, go compiler toolchain, cmd/go

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques

Collection

Discovery

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References

https://go.dev/cl/763882

https://go.dev/issue/78584

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

groups.google.com

and 1 more references View all →

Timeline

Published

May 7, 2026

Last Updated

May 13, 2026

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