CVE-2026-94447CWE-354

CVE-2026-94447

High · published October 9, 2026

CVSS v3.1
7.8
EPSS
0%
Percentile
0.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00103 · 0.9th percentile
Weakness
CWE-354 · Improper Validation of Integrity Check Value
Published
2026-10-09T03:17Z
References (4)
https://go.dev/cl/840785 · [email protected]https://go.dev/issue/81834 · [email protected]https://groups.google.com/g/golang-announce/c/U2fTuyDJznI · [email protected]https://pkg.go.dev/vuln/GO-2026-6602 · [email protected]
EPSS history
Timeline
  • 10 OCT 03:32Z
    EPSS moved — → 0%
    epss
  • 08 OCT 22:53Z
    Checksum database bypass for golang.org/toolchain in cmd/go
    cvelistv5
  • 08 OCT 22:53Z
    Checksum database bypass for golang.org/toolchain in cmd/go
    cvelistv5