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High severity8.4NVD Advisory· Published Aug 13, 2026· Updated Sep 3, 2026

CVE-2026-56865

CVE-2026-56865

Description

A malicious GOPROXY was previously capable of forging up to two sumdb tiles that allow for a requested module to bypass the GOSUMDB check and persist attacker-controlled module content to a local Go module cache. This attack allows for a malicious GOPROXY to serve malicious module content that cannot be detected by evaluating the transparency log. All tiles are now correctly verified against their parents. In order to determine if you have been affected: rm -r go.sum go.work.sum vendor/ && go mod tidy

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Affected products

1439

Patches

Vulnerability mechanics

References

5

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