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
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Go toolchain cmd/go
Default version status: unaffected
0 to < 1.25.13affected1.26.0-0 to < 1.26.6affected1.27.0-0 to < 1.27.0-rc.3affected
golang.org/x/mod golang.org/x/mod/sumdb/tlog
Default version status: unaffected
0 to < 0.40.0affected