CVE-2026-39817

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

State: Published
Severity: 5.9 Medium
Published: May 7, 2026
Updated: May 8, 2026
Reserved: Apr 7, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.9 Medium	CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N	CISA-ADP

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
cmd/goGo toolchain	before 1.25.10Affected 1.26.0-0 to before 1.26.3Affected

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

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.