Security Bulletin: Vulnerability in golang.org/x/mod bundled with IBM Fusion and IBM Fusion HCI

Summary IBM Fusion, IBM Fusion HCI, and IBM Fusion Data Cataloging include the golang.org/x/mod library, which is affected by multiple vulnerabilities, including Improper verification of cryptographic signatures and integrity verification bypass. CVE-2026-56864, CVE-2026-56865. Vulnerability...

ROOT-APP-GOBINARY-CVE-2026-56865 CVE-2026-56865 in golang.org/x/mod - Patched by Root

Root has patched CVE-2026-56865 in the golang.org/x/mod package for Root:Go. Multiple fixed versions available...

ROOT-APP-GOBINARY-CVE-2026-56864 CVE-2026-56864 in golang.org/x/mod - Patched by Root

Root has patched CVE-2026-56864 in the golang.org/x/mod package for Root:Go. Multiple fixed versions available...

CVE-2026-56864

A flaw was found in golang.org/x/mod/sumdb. A malicious Go checksum database GOSUMDB can serve arbitrary module content that is not recorded in the transparency log. This allows a coordinated Go proxy GOPROXY and GOSUMDB to deliver malicious module content to a client, which cannot be detected by...

BIT-GOLANG-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...

BIT-GOLANG-2026-56864 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...

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...

CVE-2026-56864

The golang package is affected by a vulnerability where a malicious GOSUMDB could serve arbitrary module content not contained within the transparency log. This allows a coordinating GOPROXY and GOSUMDB to deliver malicious module content to a client that cannot be detected by evaluating the tran...

CVE-2026-56864 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...

CVE-2026-56864 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...

CVE-2026-56865

A vulnerability in x/mod/sumdb/tlog allows a malicious GOPROXY to forge up to two sumdb tiles. This enables an attacker to bypass GOSUMDB checks and persist attacker-controlled module content to a local Go module cache. This attack allows for the distribution of malicious module content that cann...

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...

GO-2026-6180 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...

GO-2026-6179 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...