CVE-2026-39817
medium
CVSS v3
5.9
CVSS v2
—
VIR risk
5.9
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.
Predictions
Exploit likelihood
59%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2026-39817.html
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2026-39817
Vendor advisory: security@golang.org — https://pkg.go.dev/vuln/GO-2026-4979
Vendor advisory: security@golang.org — https://go.dev/cl/767520
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | bullseye | affected | |
| debian | trixie | affected | |
| debian | forky | fixed | 1.25.10-1 |
| debian | bookworm | affected | |
| debian | sid | fixed | 1.25.10-1 |
| sles | affected | |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Go | toolchain | >=1.26.0-0,<1.26.3 | 1.25.10 |
References
CWEs
CWE-787
Verify integrity in audit chain (admin only). AS-IS.