8.4

CVE-2026-56865

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

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
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerGo toolchain
≫
Produkt cmd/go
Default Statusunaffected
Version 0
Version < 1.25.13
Status affected
Version 1.26.0-0
Version < 1.26.6
Status affected
Version 1.27.0-0
Version < 1.27.0-rc.3
Status affected
Herstellergolang.org/x/mod
≫
Produkt golang.org/x/mod/sumdb/tlog
Default Statusunaffected
Version 0
Version < 0.40.0
Status affected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.11% 0.013
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
CISA-ADP 8.4 2.5 5.9
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-347 Improper Verification of Cryptographic Signature

The product does not verify, or incorrectly verifies, the cryptographic signature for data.

https://groups.google.com/g/golang-announce/c/94pEornpRlI
https://go.dev/cl/815020
https://go.dev/issue/80744
https://go.dev/cl/814960
https://pkg.go.dev/vuln/GO-2026-6179