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Vulnerabilities CVE-2026-56865

CVE-2026-56865

None
Open
TLP:CLEAR

Fix transparency log tile verification bypass in golang.org/x/mod/sumdb/tlog

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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

Details

Confidence
90%
Published
Aug 13, 2026
Last Modified
Aug 13, 2026
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