CVE-2026-94447 Checksum database bypass for golang.org/toolchain in cmd/go
Attackers can bypass checksum verification for Go toolchains using malicious proxies, potentially leading to code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-94447?
CVE-2026-94447 is a high-severity vulnerability in cmd/go, published on 8 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Previously, a user operating inside of a malicious Go project that defines a bogus golang.org/toolchain go.sum entry and operates a malicious GOMODPROXY the user chooses to use can bypass the intended checksum. We now ensure that golang.org/toolchain always goes to the network for the canonical checksum.
Weakness: CWE-354
Which versions are affected by CVE-2026-94447?
2 open source packages ship an affected version, including golang and toolchain.
| Package | Affected | Fixed in |
|---|---|---|
golang Bitnami | All versions | 1.26.9, 1.27.2 |
toolchain Go | All versions | 1.26.9, 1.27.2 |
How do I fix CVE-2026-94447?
Upgrade golang to a fixed version for your release line: 1.26.9 or 1.27.2.
Is CVE-2026-94447 being exploited?
There is no known exploitation of CVE-2026-94447 in the wild and no public exploit code.
Sources
Also known as AZL-107454, AZL-107483, BELL-CVE-2026-94447, BIT-golang-2026-94447, DEBIAN-CVE-2026-94447, GHSA-cgx4-3g64-rvr7 and 2147 more.