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CVE-2026-56865 on CTRL-OS 26.05

Aliases: CVE-2026-56865

Packages: go_1_27

Status: In Progress, Resolved

Advisory Information

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

Updates

2026-08-17 11:43 CEST

Metadata changes:

  • Status for package go_1_27: “Resolved” (e5bcd467cf926a27830bf0bced347f434271ac0c)

2026-08-17 11:41 CEST

Metadata changes:

  • Status for package go: “In Progress” (caf3d299c87a63b58deab6b597dc7adf4f762ba1)
  • Status for package go_1_26: “In Progress” (caf3d299c87a63b58deab6b597dc7adf4f762ba1)

2026-08-17 11:39 CEST

Metadata changes:

  • Status for package go_1_25: “Resolved” (95b632a8007bdaebc2c08b6e07292702eceade51)

Comment:

Fixed by updating to Go 1.25.3.

2026-08-17 11:38 CEST

Metadata changes:

  • Status for package go: “Acknowledged”
  • Status for package go_1_25: “Acknowledged”
  • Status for package go_1_26: “Acknowledged”