What is CVE-2026-42501?

CVE-2026-42501 is a high-severity vulnerability in Golang Go, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2026-05-07.

How severe is CVE-2026-42501?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Golang Go

CVE-2026-42501

A malicious module proxy can exploit a flaw in the go command's validation of module checksums to bypass checksum database validation. This vulnerability affects any user using an untrusted module proxy (GOMODPROXY) or checksum database (G…

EPSS: 0.000 (0.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Golang Go
Go Toolchain Cmd/go — versions 0, 1.26.0-0

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

security@golang.org (Patch)
security@golang.org (Issue Tracking)
security@golang.org (Release Notes)
security@golang.org (Vendor Advisory)

Frequently asked questions

What is CVE-2026-42501?: CVE-2026-42501 is a high-severity vulnerability in Golang Go, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2026-05-07.
How severe is CVE-2026-42501?: High severity. CVSS v3 base score is 7.5 out of 10.