CVE catalog
CVE-2026-56865
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 m
- Severity
- Critical · CVSS 9.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.13% · Oct 25, 2026
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
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | golang-1.19 | bookworm | 1.19.8-2 | vulnerable |
| Go | toolchain | Not reported | 1.27.0-rc.3 | fixed |
| Go | toolchain | Not reported | 1.25.13 | fixed |
| Go | toolchain | Not reported | 1.26.6 | fixed |
| Go | golang.org/x/mod | Not reported | 0.40.0 | fixed |
| Ubuntu | golang-1.22 | noble | 1.22.2-2ubuntu0.5 | fixed |
| Ubuntu | golang-1.22-doc | noble | 1.22.2-2ubuntu0.5 | fixed |
| Ubuntu | golang-1.22-go | noble | 1.22.2-2ubuntu0.5 | fixed |
| Ubuntu | golang-1.22-src | noble | 1.22.2-2ubuntu0.5 | fixed |
| Ubuntu | golang-1.10 | 14.04 | 1.10.4-2ubuntu1~14.04.1 | vulnerable |
| Ubuntu | golang-1.10 | 16.04 | 1.10.4-2ubuntu1~16.04.1 | vulnerable |
| Ubuntu | golang-1.10 | 16.04 | 1.10.4-2ubuntu1~16.04.2 | vulnerable |
| Ubuntu | golang-1.6 | 16.04 | 1.6-0ubuntu1 | vulnerable |
| Ubuntu | golang-1.6 | 16.04 | 1.6-0ubuntu2 | vulnerable |
| Ubuntu | golang-1.6 | 16.04 | 1.6-0ubuntu3 | vulnerable |
| Ubuntu | golang-1.6 | 16.04 | 1.6-0ubuntu4 | vulnerable |
| Ubuntu | golang-1.6 | 16.04 | 1.6-0ubuntu5 | vulnerable |
| Ubuntu | golang-1.6 | 16.04 | 1.6.1-0ubuntu1 | vulnerable |
| Ubuntu | golang-1.6 | 16.04 | 1.6.2-0ubuntu5~16.04 | vulnerable |
| Ubuntu | golang-1.6 | 16.04 | 1.6.2-0ubuntu5~16.04.2 | vulnerable |
| Ubuntu | golang-1.6 | 16.04 | 1.6.2-0ubuntu5~16.04.3 | vulnerable |
| Ubuntu | golang-1.6 | 16.04 | 1.6.2-0ubuntu5~16.04.4 | vulnerable |
| Ubuntu | golang-1.13 | pro | 1.13.8-1ubuntu2 | vulnerable |
| Ubuntu | golang-1.13 | pro | 1.13.8-1ubuntu2.22.04.1 | vulnerable |
| Ubuntu | golang-1.13 | pro | 1.13.8-1ubuntu2.22.04.1+esm1 | vulnerable |
| Ubuntu | golang-1.13 | pro | 1.13.8-1ubuntu2.22.04.2 | vulnerable |
| Ubuntu | golang-1.18 | pro | 1.18.1-1ubuntu1~18.04.3 | vulnerable |
| Ubuntu | golang-1.18 | pro | 1.18.1-1ubuntu1~18.04.4 | vulnerable |
| Ubuntu | golang-1.18 | pro | 1.18.1-1ubuntu1~18.04.4+esm1 | vulnerable |
| Ubuntu | golang-1.10 | 18.04 | 1.10~rc1-1 | vulnerable |
| Ubuntu | golang-1.10 | 18.04 | 1.10~rc1-1ubuntu1 | vulnerable |
| Ubuntu | golang-1.10 | 18.04 | 1.10~rc1-2ubuntu1 | vulnerable |
| Ubuntu | golang-1.10 | 18.04 | 1.10~rc2-1ubuntu1 | vulnerable |
| Ubuntu | golang-1.10 | 18.04 | 1.10-1ubuntu1 | vulnerable |
| Ubuntu | golang-1.10 | 18.04 | 1.10.1-1ubuntu2 | vulnerable |
| Ubuntu | golang-1.10 | 18.04 | 1.10.4-2ubuntu1~18.04.1 | vulnerable |
| Ubuntu | golang-1.10 | 18.04 | 1.10.4-2ubuntu1~18.04.2 | vulnerable |
| Ubuntu | golang-1.16 | pro | 1.16.2-0ubuntu1~20.04 | vulnerable |
| Ubuntu | golang-1.16 | pro | 1.16.2-0ubuntu1~20.04.1 | vulnerable |
| Ubuntu | golang-1.16 | pro | 1.16.2-0ubuntu1~20.04.1+esm1 | vulnerable |
| Ubuntu | golang-1.8 | 18.04 | 1.8.3-2ubuntu1 | vulnerable |
| Ubuntu | golang-1.8 | 18.04 | 1.8.3-2ubuntu1.18.04.1 | vulnerable |
| Ubuntu | golang-1.9 | 18.04 | 1.9.1-2ubuntu1 | vulnerable |
| Ubuntu | golang-1.9 | 18.04 | 1.9.2-1ubuntu1 | vulnerable |
| Ubuntu | golang-1.9 | 18.04 | 1.9.2-3ubuntu1 | vulnerable |
| Ubuntu | golang-1.9 | 18.04 | 1.9.3-1ubuntu1 | vulnerable |
| Ubuntu | golang-1.9 | 18.04 | 1.9.4-1ubuntu1 | vulnerable |
| Ubuntu | golang-1.13 | 20.04 | 1.13.1-1ubuntu1 | vulnerable |
| Ubuntu | golang-1.13 | 20.04 | 1.13.3-1ubuntu1 | vulnerable |
| Ubuntu | golang-1.13 | 20.04 | 1.13.4-1ubuntu1 | vulnerable |
| Ubuntu | golang-1.13 | 20.04 | 1.13.5-1ubuntu1 | vulnerable |
| Ubuntu | golang-1.13 | 20.04 | 1.13.6-1ubuntu1 | vulnerable |
| Ubuntu | golang-1.13 | 20.04 | 1.13.6-2ubuntu1 | vulnerable |
| Ubuntu | golang-1.13 | 20.04 | 1.13.7-1ubuntu1 | vulnerable |
| Ubuntu | golang-1.13 | 20.04 | 1.13.8-1ubuntu1 | vulnerable |
| Ubuntu | golang-1.13 | 20.04 | 1.13.8-1ubuntu1.1 | vulnerable |
| Ubuntu | golang-1.13 | 20.04 | 1.13.8-1ubuntu1.2 | vulnerable |
| Ubuntu | golang-1.14 | 20.04 | 1.14~beta1-1 | vulnerable |
| Ubuntu | golang-1.14 | 20.04 | 1.14~beta1-2 | vulnerable |
| Ubuntu | golang-1.14 | 20.04 | 1.14~rc1-1 | vulnerable |
| Ubuntu | golang-1.14 | 20.04 | 1.14-1 | vulnerable |
| Ubuntu | golang-1.14 | 20.04 | 1.14.1-1 | vulnerable |
| Ubuntu | golang-1.14 | 20.04 | 1.14.2-1 | vulnerable |
| Ubuntu | golang-1.14 | 20.04 | 1.14.2-1ubuntu1 | vulnerable |
| Ubuntu | golang-1.14 | 20.04 | 1.14.3-2ubuntu2~20.04.1 | vulnerable |
| Ubuntu | golang-1.14 | 20.04 | 1.14.3-2ubuntu2~20.04.2 | vulnerable |
| Ubuntu | golang-1.18 | 20.04 | 1.18.1-1ubuntu1~20.04.1 | vulnerable |
| Ubuntu | golang-1.18 | 20.04 | 1.18.1-1ubuntu1~20.04.2 | vulnerable |
| Ubuntu | golang-1.18 | 20.04 | 1.18.1-1ubuntu1~20.04.3 | vulnerable |
| Ubuntu | golang-1.20 | 20.04 | 1.20.3-1ubuntu0.1~20.04 | vulnerable |
| Ubuntu | golang-1.20 | 20.04 | 1.20.3-1ubuntu0.1~20.04.1 | vulnerable |
| Ubuntu | golang-1.21 | 20.04 | 1.21.1-1~ubuntu20.04.1 | vulnerable |
| Ubuntu | golang-1.21 | 20.04 | 1.21.1-1~ubuntu20.04.2 | vulnerable |
| Ubuntu | golang-1.21 | 20.04 | 1.21.1-1~ubuntu20.04.3 | vulnerable |
| Ubuntu | golang-1.17 | 22.04 | 1.17-1ubuntu2 | vulnerable |
| Ubuntu | golang-1.17 | 22.04 | 1.17.3-1ubuntu1 | vulnerable |
| Ubuntu | golang-1.17 | 22.04 | 1.17.3-1ubuntu2 | vulnerable |
| Ubuntu | golang-1.17 | 22.04 | 1.17.13-3ubuntu1 | vulnerable |
| Ubuntu | golang-1.17 | 22.04 | 1.17.13-3ubuntu1.2 | vulnerable |
| Ubuntu | golang-1.17 | 22.04 | 1.17.13-3ubuntu1.3 | vulnerable |
| Ubuntu | golang-1.18 | 22.04 | 1.18~beta1-0ubuntu1 | vulnerable |
| Ubuntu | golang-1.18 | 22.04 | 1.18~beta2-1ubuntu1 | vulnerable |
| Ubuntu | golang-1.18 | 22.04 | 1.18~beta2-1ubuntu2 | vulnerable |
| Ubuntu | golang-1.18 | 22.04 | 1.18~rc1-1ubuntu1 | vulnerable |
| Ubuntu | golang-1.18 | 22.04 | 1.18-1ubuntu1 | vulnerable |
| Ubuntu | golang-1.18 | 22.04 | 1.18.1-1ubuntu1 | vulnerable |
| Ubuntu | golang-1.18 | 22.04 | 1.18.1-1ubuntu1.1 | vulnerable |
| Ubuntu | golang-1.18 | 22.04 | 1.18.1-1ubuntu1.2 | vulnerable |
| Ubuntu | golang-1.18 | 22.04 | 1.18.1-1ubuntu1.3 | vulnerable |
| Ubuntu | golang-1.20 | 22.04 | 1.20.3-1ubuntu0.1~22.04 | vulnerable |
| Ubuntu | golang-1.20 | 22.04 | 1.20.3-1ubuntu0.1~22.04.1 | vulnerable |
| Ubuntu | golang-1.21 | 22.04 | 1.21.1-1~ubuntu22.04.1 | vulnerable |
| Ubuntu | golang-1.21 | 22.04 | 1.21.1-1~ubuntu22.04.2 | vulnerable |
| Ubuntu | golang-1.21 | 22.04 | 1.21.1-1~ubuntu22.04.3 | vulnerable |
| Ubuntu | golang-1.21 | 22.04 | 1.21.1-1~ubuntu22.04.4 | vulnerable |
| Ubuntu | golang-1.22 | 22.04 | 1.22.2-2~22.04 | vulnerable |
| Ubuntu | golang-1.22 | 22.04 | 1.22.2-2~22.04.1 | vulnerable |
| Ubuntu | golang-1.22 | 22.04 | 1.22.2-2~22.04.2 | vulnerable |
| Ubuntu | golang-1.22 | 22.04 | 1.22.2-2~22.04.3 | vulnerable |
| Ubuntu | golang-1.22 | 22.04 | 1.22.2-2~22.04.4 | fixed |
| Ubuntu | golang-1.23 | 22.04 | 1.23.1-1~22.04 | vulnerable |
| Ubuntu | golang-1.23 | 22.04 | 1.23.1-1~22.04.2 | vulnerable |
| Ubuntu | golang-1.23 | 22.04 | 1.23.1-1~22.04.3 | vulnerable |
| Ubuntu | golang-1.24 | 22.04 | 1.24.4-1ubuntu1~22.04.1 | vulnerable |
| Ubuntu | golang-1.24 | 22.04 | 1.24.4-1ubuntu1~22.04.2 | vulnerable |
| Ubuntu | golang-1.24 | 22.04 | 1.24.13-2~22.04.1 | vulnerable |
| Ubuntu | golang-1.24 | 22.04 | 1.24.13-2~22.04.2 | vulnerable |
| Ubuntu | golang-1.25 | 22.04 | 1.25.14-1~ubuntu0.22.04.1 | vulnerable |
| Ubuntu | golang-1.21 | 24.04 | 1.21.1-1 | vulnerable |
| Ubuntu | golang-1.21 | 24.04 | 1.21.3-1 | vulnerable |
| Ubuntu | golang-1.21 | 24.04 | 1.21.4-1 | vulnerable |
| Ubuntu | golang-1.21 | 24.04 | 1.21.5-1 | vulnerable |
| Ubuntu | golang-1.21 | 24.04 | 1.21.6-1 | vulnerable |
| Ubuntu | golang-1.21 | 24.04 | 1.21.7-1 | vulnerable |
| Ubuntu | golang-1.21 | 24.04 | 1.21.7-2 | vulnerable |
| Ubuntu | golang-1.21 | 24.04 | 1.21.8-1 | vulnerable |
| Ubuntu | golang-1.21 | 24.04 | 1.21.8-1build1 | vulnerable |
| Ubuntu | golang-1.21 | 24.04 | 1.21.9-1 | vulnerable |
| Ubuntu | golang-1.21 | 24.04 | 1.21.9-1ubuntu0.1 | vulnerable |
| Ubuntu | golang-1.22 | 24.04 | 1.22~rc1-2 | vulnerable |
| Ubuntu | golang-1.22 | 24.04 | 1.22.0-1 | vulnerable |
| Ubuntu | golang-1.22 | 24.04 | 1.22.0-2 | vulnerable |
| Ubuntu | golang-1.22 | 24.04 | 1.22.1-1 | vulnerable |
| Ubuntu | golang-1.22 | 24.04 | 1.22.1-1build1 | vulnerable |
| Ubuntu | golang-1.22 | 24.04 | 1.22.2-2 | vulnerable |
| Ubuntu | golang-1.22 | 24.04 | 1.22.2-2ubuntu0.1 | vulnerable |
| Ubuntu | golang-1.22 | 24.04 | 1.22.2-2ubuntu0.2 | vulnerable |
| Ubuntu | golang-1.22 | 24.04 | 1.22.2-2ubuntu0.3 | vulnerable |
| Ubuntu | golang-1.22 | 24.04 | 1.22.2-2ubuntu0.4 | vulnerable |
| Ubuntu | golang-1.22 | 24.04 | 1.22.2-2ubuntu0.5 | fixed |
| Ubuntu | golang-1.23 | 24.04 | 1.23.1-1~24.04 | vulnerable |
| Ubuntu | golang-1.23 | 24.04 | 1.23.1-1~24.04.1 | vulnerable |
| Ubuntu | golang-1.24 | 24.04 | 1.24.4-1ubuntu1~24.04.1 | vulnerable |
| Ubuntu | golang-1.24 | 24.04 | 1.24.4-1ubuntu1~24.04.2 | vulnerable |
| Ubuntu | golang-1.24 | 24.04 | 1.24.13-2~24.04.1 | vulnerable |
| Ubuntu | golang-1.25 | 24.04 | 1.25.14-1~ubuntu0.24.04.1 | vulnerable |
| Ubuntu | golang-1.23 | 26.04 | 1.23.10-1 | vulnerable |
| Ubuntu | golang-1.24 | 26.04 | 1.24.4-1ubuntu1 | vulnerable |
| Ubuntu | golang-1.24 | 26.04 | 1.24.9-1 | vulnerable |
| Ubuntu | golang-1.24 | 26.04 | 1.24.13-2 | vulnerable |
| Ubuntu | golang-1.25 | 26.04 | 1.25.0-0ubuntu1 | vulnerable |
| Ubuntu | golang-1.25 | 26.04 | 1.25.7-2 | vulnerable |
| Ubuntu | golang-1.25 | 26.04 | 1.25.14-1~ubuntu0.26.04.1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | golang-1.19 | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
| Go | toolchain | Go | Not reported | 1.27.0-rc.3 | Not reported | GO-2026-6179 | Not reported |
| Go | toolchain | Go | Not reported | 1.25.13 | Not reported | GO-2026-6179 | Not reported |
| Go | toolchain | Go | Not reported | 1.26.6 | Not reported | GO-2026-6179 | Not reported |
| Go | golang.org/x/mod | Go | Not reported | 0.40.0 | Not reported | GO-2026-6179 | Not reported |
| Ubuntu | golang-1.22 | deb | noble | 1.22.2-2ubuntu0.5 | Not reported | Not reported | Not reported |
| Ubuntu | golang-1.22-doc | deb | noble | 1.22.2-2ubuntu0.5 | Not reported | Not reported | Not reported |
| Ubuntu | golang-1.22-go | deb | noble | 1.22.2-2ubuntu0.5 | Not reported | Not reported | Not reported |
| Ubuntu | golang-1.22-src | deb | noble | 1.22.2-2ubuntu0.5 | Not reported | Not reported | Not reported |
| Ubuntu | golang-1.22 | deb | 22.04 | 1.22.2-2~22.04.4 | Not reported | UBUNTU-CVE-2026-56865 | Not reported |
| Ubuntu | golang-1.22 | deb | 24.04 | 1.22.2-2ubuntu0.5 | Not reported | UBUNTU-CVE-2026-56865 | Not reported |
Notes
[bookworm] golang-1.19: Limited support
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [golang-1.19]Affected
Details (2)
1.19.8-2· all · bookwormAffected
nvd · golang-1.19 · debian · bookworm; nvd · golang-1.19 · debian · 12
1.19.8-2· all · bookwormAffected
nvd · golang-1.19 · debian · bookworm; nvd · golang-1.19 · debian · 12
- [golang-1.19-doc]Affected
Source package: [golang-1.19]
Details (2)
1.19.8-2· all · bookwormAffected
nvd · golang-1.19 · debian · bookworm; nvd · golang-1.19 · debian · 12
1.19.8-2· all · bookwormAffected
nvd · golang-1.19 · debian · bookworm; nvd · golang-1.19 · debian · 12
- [golang-1.19-go]Affected
Source package: [golang-1.19]
Details (2)
1.19.8-2· amd64 · bookwormAffected
nvd · golang-1.19 · debian · bookworm; nvd · golang-1.19 · debian · 12
1.19.8-2· arm64 · bookwormAffected
nvd · golang-1.19 · debian · bookworm; nvd · golang-1.19 · debian · 12
- [golang-1.19-src]Affected
Source package: [golang-1.19]
Details (2)
1.19.8-2· all · bookwormAffected
nvd · golang-1.19 · debian · bookworm; nvd · golang-1.19 · debian · 12
1.19.8-2· all · bookwormAffected
nvd · golang-1.19 · debian · bookworm; nvd · golang-1.19 · debian · 12
[Debian 13 (Trixie)]
- [golang-1.24]Affected
Details (2)
1.24.4-1· all · trixieAffected
nvd · golang-1.24 · debian · 13
1.24.4-1· all · trixieAffected
nvd · golang-1.24 · debian · 13
- [golang-1.24-doc]Affected
Source package: [golang-1.24]
Details (2)
1.24.4-1· all · trixieAffected
nvd · golang-1.24 · debian · 13
1.24.4-1· all · trixieAffected
nvd · golang-1.24 · debian · 13
- [golang-1.24-go]Affected
Source package: [golang-1.24]
Details (2)
1.24.4-1· amd64 · trixieAffected
nvd · golang-1.24 · debian · 13
1.24.4-1· arm64 · trixieAffected
nvd · golang-1.24 · debian · 13
- [golang-1.24-src]Affected
Source package: [golang-1.24]
Details (2)
1.24.4-1· all · trixieAffected
nvd · golang-1.24 · debian · 13
1.24.4-1· all · trixieAffected
nvd · golang-1.24 · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11516-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-56865]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-56865]
- [https://osv.dev/vulnerability/GO-2026-6179]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-56865]
- [https://security-tracker.debian.org/tracker/CVE-2026-56865]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-56865.json]
- [https://ubuntu.com/security/notices/USN-8935-1]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2850.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [Go Vulnerability Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]