CVE-2026-39817
Medium
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.
SeverityMedium
CVSS5.9
Exploit probability—
ProductGo
PublishedMay 7, 2026
First seenMay 7, 2026
Weakness typeCWE-22Path traversal
How to fix
Update
- golang go1.25.10, 1.26.3 or later
- toolchain1.25.10, 1.26.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| golang go | v < 1.25.10, 1.26.0 ≤ v < 1.26.3 | 1.25.10, 1.26.3 |
| toolchainGo | v < 1.25.10, 1.26.0-0 ≤ v < 1.26.3 | 1.25.10, 1.26.3 |
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