# CVE-2026-56864: Ignore unrelated, unauthenticated hashes in Lookup in golang.org/x/mod/sumdb CVE-2026-56864 is fixed in 18 products on 2 platforms, first by SUSE-SU-2026:3640-1, released August 18, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-56864 - Priority: High - CVSS: 7.5 (Moderate) - EPSS: 0.0030 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Aug 13, 2026 - Weakness: Improper Verification of Cryptographic Signature - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56864 ## Description 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 ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Windows apps | Go Programming Language | 1.27.3 | [Go Programming Language 1.27.3](https://patchblox.com/security/data/fix/windows-app/golang.go-1.27.3.md) | Oct 19, 2026 | | Linux | cosign opensuse-leap 16.0 | 3.1.3-160000.1.1 | [OPENSUSE-SU-2026:22064-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22064-1.md) | Nov 7, 2026 | | Linux | cosign sles 15.6 | 3.1.3-150400.3.57.1 | [SUSE-SU-2026:4392-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4392-1.md) | Sep 29, 2026 | | Linux | cosign sles 15.7 | 3.1.3-150400.3.57.1 | [SUSE-SU-2026:4392-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4392-1.md) | Sep 29, 2026 | | Linux | cosign sles 16.0 | 3.1.3-160000.1.1 | [SUSE-SU-2026:24213-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-24213-1.md) | Nov 7, 2026 | | Linux | go1.25 opensuse-leap 16.0 | 1.25.13-160000.1.1 | [OPENSUSE-SU-2026:21592-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21592-1.md) | Aug 19, 2026 | | Linux | go1.25 sles 15.6 | 1.25.13-150000.1.50.1 | [SUSE-SU-2026:3640-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3640-1.md) | Aug 18, 2026 | | Linux | go1.25 sles 15.7 | 1.25.13-150000.1.50.1 | [SUSE-SU-2026:3640-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3640-1.md) | Aug 18, 2026 | | Linux | go1.25 sles 16.0 | 1.25.13-160000.1.1 | [SUSE-SU-2026:23300-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23300-1.md) | Aug 19, 2026 | | Linux | go1.25-openssl opensuse-leap 16.0 | 1.25.14-160000.1.1 | [OPENSUSE-SU-2026:21696-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21696-1.md) | Aug 30, 2026 | | Linux | go1.25-openssl sles 15.6 | 1.25.14-150600.13.27.1 | [SUSE-SU-2026:3815-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3815-1.md) | Aug 26, 2026 | | Linux | go1.25-openssl sles 15.7 | 1.25.14-150600.13.27.1 | [SUSE-SU-2026:3815-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3815-1.md) | Aug 26, 2026 | | Linux | go1.25-openssl sles 16.0 | 1.25.14-160000.1.1 | [SUSE-SU-2026:23573-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23573-1.md) | Aug 30, 2026 | | Linux | go1.26 opensuse-leap 16.0 | 1.26.6-160000.1.1 | [OPENSUSE-SU-2026:21593-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21593-1.md) | Aug 19, 2026 | | Linux | go1.26 sles 15.6 | 1.26.6-150000.1.24.1 | [SUSE-SU-2026:3641-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3641-1.md) | Aug 18, 2026 | | Linux | go1.26 sles 15.7 | 1.26.6-150000.1.24.1 | [SUSE-SU-2026:3641-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3641-1.md) | Aug 18, 2026 | | Linux | go1.26 sles 16.0 | 1.26.6-160000.1.1 | [SUSE-SU-2026:23301-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23301-1.md) | Aug 19, 2026 | | Linux | go1.26-openssl opensuse-leap 16.0 | 1.26.7-160000.1.1 | [OPENSUSE-SU-2026:21705-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21705-1.md) | Aug 30, 2026 | | Linux | go1.26-openssl sles 15.6 | 1.26.7-150600.13.15.1 | [SUSE-SU-2026:3816-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3816-1.md) | Aug 26, 2026 | | Linux | go1.26-openssl sles 15.7 | 1.26.7-150600.13.15.1 | [SUSE-SU-2026:3816-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3816-1.md) | Aug 26, 2026 | | Linux | go1.26-openssl sles 16.0 | 1.26.7-160000.1.1 | [SUSE-SU-2026:23576-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23576-1.md) | Aug 30, 2026 | | Linux | go1.27 sles 15.6 | 1.27.0-150000.1.6.1 | [SUSE-SU-2026:3830-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3830-1.md) | Aug 26, 2026 | | Linux | go1.27 sles 15.7 | 1.27.0-150000.1.6.1 | [SUSE-SU-2026:3830-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3830-1.md) | Aug 26, 2026 | | Linux | golang amzn 2023 | 1.26.7-1.amzn2023.0.1 | [ALAS2023-2026-2114](https://patchblox.com/security/data/fix/linux/alas2023-2026-2114.md) | Aug 31, 2026 | | Linux | golang-1.26 Debian 14 | 1.26.6-1 | [DEBIAN-CVE-2026-56864](https://patchblox.com/security/data/fix/linux/debian-cve-2026-56864.md) | Aug 27, 2026 | | Linux | golang-1.27 Debian 14 | 1.27~rc3-1 | [DEBIAN-CVE-2026-56864](https://patchblox.com/security/data/fix/linux/debian-cve-2026-56864.md) | Aug 27, 2026 | | Linux | golang-bin amzn 2023 | 1.26.7-1.amzn2023.0.1 | [ALAS2023-2026-2114](https://patchblox.com/security/data/fix/linux/alas2023-2026-2114.md) | Aug 31, 2026 | | Linux | golang-docs amzn 2023 | 1.26.7-1.amzn2023.0.1 | [ALAS2023-2026-2114](https://patchblox.com/security/data/fix/linux/alas2023-2026-2114.md) | Aug 31, 2026 | | Linux | golang-misc amzn 2023 | 1.26.7-1.amzn2023.0.1 | [ALAS2023-2026-2114](https://patchblox.com/security/data/fix/linux/alas2023-2026-2114.md) | Aug 31, 2026 | | Linux | golang-shared amzn 2023 | 1.26.7-1.amzn2023.0.1 | [ALAS2023-2026-2114](https://patchblox.com/security/data/fix/linux/alas2023-2026-2114.md) | Aug 31, 2026 | | Linux | golang-src amzn 2023 | 1.26.7-1.amzn2023.0.1 | [ALAS2023-2026-2114](https://patchblox.com/security/data/fix/linux/alas2023-2026-2114.md) | Aug 31, 2026 | | Linux | golang-tests amzn 2023 | 1.26.7-1.amzn2023.0.1 | [ALAS2023-2026-2114](https://patchblox.com/security/data/fix/linux/alas2023-2026-2114.md) | Aug 31, 2026 | | Linux | govulncheck-vulndb opensuse-leap 16.0 | 0.0.20260827T195228-160000.1.1 | [OPENSUSE-SU-2026:21761-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21761-1.md) | Sep 4, 2026 | | Linux | govulncheck-vulndb sles 16.0 | 0.0.20260827T195228-160000.1.1 | [SUSE-SU-2026:23625-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23625-1.md) | Sep 4, 2026 | | Linux | helm opensuse-leap 16.0 | 4.3.0-160000.1.1 | [OPENSUSE-SU-2026:21983-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21983-1.md) | Sep 30, 2026 | | Linux | helm sles 16.0 | 4.3.0-160000.1.1 | [SUSE-SU-2026:23984-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23984-1.md) | Sep 30, 2026 | --- Data as of 2026-11-08T19:12:23Z UTC. 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