CVE-2026-39817

MEDIUM

Invoking "go tool pack" does not sanitize output paths in cmd/go

Title source: cna

Description

The "go tool pack" subcommand (usually used only by the compiler as an internal tool with known-good inputs) does not sanitize output filenames. Extracting a malicious archive file with the "pack" subcommand can write files to arbitrary locations on the filesystem.

References (4)

Core 4

Core References

https://go.dev/issue/78778

https://go.dev/cl/767520

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

https://pkg.go.dev/vuln/GO-2026-4979

Scores

CVSS v3 5.9

EPSS 0.0001

EPSS Percentile 0.2%

Attack Vector LOCAL

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-787

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