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CVE-2026-56864 High

Ignore unrelated, unauthenticated hashes in Lookup in golang.org/x/mod/sumdb

A malicious GOSUMDB was capable of serving arbitrary module content not contained within the transparency log. This attack allows for a coordinating GOPROXY and GOSUMDB to serve a client malicious module content that cannot be detected by evaluating the transparency log. In order to determine if you have been affected: rm -r go.sum go.work.sum vendor/ && go mod tidy

Exploit probability Not scored
Published August 19, 2026
Required by Not available
Last source change August 19, 2026

02 / AFFECTED SOFTWARE

Affected packages

Go golang.org/x/mod
Go toolchain
Bitnami golang

03 / CONNECTIONS

Connected vulnerabilities

04 / EVIDENCE

Source records

Open Source Vulnerabilities GO-2026-6180

A malicious GOSUMDB was capable of serving arbitrary module content not contained within the transparency log. This attack allows for a coordinating GOPROXY and GOSUMDB to serve a client malicious module content that cannot be detected by evaluating the transparency log. In order to determine if you have been affected: rm -r go.sum go.work.sum vendor/ && go mod tidy

View original source
Open Source Vulnerabilities BIT-golang-2026-56864

A malicious GOSUMDB was capable of serving arbitrary module content not contained within the transparency log. This attack allows for a coordinating GOPROXY and GOSUMDB to serve a client malicious module content that cannot be detected by evaluating the transparency log. In order to determine if you have been affected: rm -r go.sum go.work.sum vendor/ && go mod tidy

View original source

05 / REFERENCES

Further evidence