CVE-2026-39817

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

Medium · published May 7, 2026

CVSS v3.1
5.9
EPSS
0%
Percentile
5.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.9 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00162 · 5.1th percentile
Published
2026-05-07T19:41Z
EPSS history
Timeline
  • 07 MAY 19:41Z
    Invoking "go tool pack" does not sanitize output paths in cmd/go
    cvelistv5