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Vulnerabilities

Vulnerability · CVE-2026-94447

Checksum database bypass for golang.org/toolchain in cmd/go

Published Oct 8, 2026 · catalog updated Oct 16, 2026 · Checksum database bypass for

Check if you run it

No confirmed exploitation is on record for CVE-2026-94447. EPSS is 0.10%. Act only if a listed version of Checksum database bypass for is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Checksum database bypass for).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.10%
Remediation
Not established
Affected products
Go toolchain

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Go toolchain0 → 1.26.9

How to fix CVE-2026-94447

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-94447. EPSS is 0.10%. Act only if a listed version of Checksum database bypass for is installed.

Which versions are affected?

Compare what you have installed with 0 → 1.26.9. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-354. EPSS 0.10%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 8, 2026 · NIST NVD

    Detected

    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.

  2. Oct 15, 2026 · NIST NVD

    Updated

    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.

  3. Oct 16, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    toolchain fixed in 1.26.9

  4. Oct 16, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    toolchain fixed in 1.26.9

  5. Oct 16, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2026-94447

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-94447

    30-day exploitation probability 0.1%

    first.org
  • Go Vulnerability DatabasePackage advisoryGO-2026-6602

    Checksum database bypass for golang.org/toolchain in cmd/go

    osv.dev
  • NIST NVDVulnerability recordCVE-2026-94447

    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 fo

    nvd.nist.gov
  • OpenSSF OSV / OSV ScannerPackage advisoryGO-2026-6602

    Checksum database bypass for golang.org/toolchain in cmd/go

    osv.dev

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.