Is toolchain affected by CVE-2026-39817?

Go toolchain is affected in =1.26.0-0 <1.26.3.

Is CVE-2026-39817 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.2%.

medium

CVE-2026-39817

Q: Is CVE-2026-39817 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.2%.

Go · toolchain

Summary

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

Severity: medium
EPSS: 0.2% (p7)
Also known as: BIT-golang-2026-39817, GO-2026-4979
Published: 2026-05-07

References

https://go.dev/issue/78778
https://go.dev/cl/767520
https://groups.google.com/g/golang-announce/c/qcCIEXso47M

Related advisories

CVE-2026-39819 — medium · Go/toolchain
CVE-2026-42501 — medium · Go/toolchain
CVE-2026-27140 — medium · Go/toolchain
CVE-2026-27144 — medium · Go/toolchain
CVE-2026-27143 — medium · Go/toolchain
CVE-2025-61732 — medium · Go/toolchain
CVE-2025-61731 — medium · Go/toolchain
CVE-2025-68119 — medium · Go/toolchain

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.