CVE-2026-39817
5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Go toolchain | cmd/go | 0 < 1.25.10 | affected |
| Go toolchain | cmd/go | 1.26.0-0 < 1.26.3 | affected |
Weaknesses
- CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
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
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