CVE-2026-39817

UNKNOWN 0.0

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

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	go toolchain
Product	cmd/go
Published	May 7, 2026

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Affected Versions

Go toolchain / cmd/go

0 < 1.25.10 1.26.0-0 < 1.26.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

go.dev: https://go.dev/issue/78778 go.dev: https://go.dev/cl/767520 groups.google.com: https://groups.google.com/g/golang-announce/c/qcCIEXso47M pkg.go.dev: https://pkg.go.dev/vuln/GO-2026-4979

Credits

Harshit Gupta (Mr HAX)