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Fencer Vulns
high 7.8

CVE-2026-94447 json

Checksum database bypass for golang.org/toolchain in cmd/go

published 2026-10-08 31 d ago modified 2026-10-16 23 d ago also BIT-golang-2026-94447 , EUVD-2026-95418 , GO-2026-6602

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 0%
public exploits
0
none known

Summary

Previously, a user operating inside of a malicious Go project that defines a bogus golang.org/toolchain go.sum entry and operates a malicious GOMODPROXY the user chooses to use can bypass the intended checksum. We now ensure that golang.org/toolchain always goes to the network for the canonical checksum.

Patch / fix

  • bitnami golang 1.26.9, 1.27.2
  • go toolchain 1.26.9, 1.27.2
  • Go toolchain cmd/go 1.26.9, 1.27.2
  • golang-1.26 Debian 14 1.26.9-1
  • golang-1.27 Debian 14 1.27.2-1

debian advisories DEBIAN-CVE-2026-94447

  • golang1.26 hummingbird 1 1.26.9-0.1.hum1
  • golang1.26-bin hummingbird 1 1.26.9-0.1.hum1
  • golang1.26-src hummingbird 1 1.26.9-0.1.hum1
  • golang1.26-misc hummingbird 1 1.26.9-0.1.hum1
  • golang1.26-tests hummingbird 1 1.26.9-0.1.hum1
  • golang1.27 hummingbird 1 1.27.2-0.1.hum1
  • golang1.27-bin hummingbird 1 1.27.2-0.1.hum1
  • golang1.27-src hummingbird 1 1.27.2-0.1.hum1

red hat advisories RHSA-2026:79720RHSA-2026:79715

  • go1.26-openssl SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 1.26.10-150000.1.21.2
  • go1.26-openssl SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Development Tools 15 SP7 1.26.10-150600.13.18.1
  • go1.26 SLES for SAP applications 16.0, SLES 16.0 1.26.9-160000.1.1
  • go1.27 SLES for SAP applications 16.0, SLES 16.0 1.27.2-160000.1.1
  • go1.26 SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 1.26.9-150000.1.33.1
  • go1.27 SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 1.27.2-150000.1.12.1

suse advisories SUSE-SU-2026:4867-1SUSE-SU-2026:4866-1SUSE-SU-2026:24239-1SUSE-SU-2026:24237-1SUSE-SU-2026:4629-1SUSE-SU-2026:4625-1

  • go1.26 openSUSE Leap 16.0 1.26.9-160000.1.1
  • go1.27 openSUSE Leap 16.0 1.27.2-160000.1.1
  • rclone openSUSE Tumbleweed 1.75.2-1.1
  • go1.27 openSUSE Tumbleweed 1.27.2-1.1
  • go1.26 openSUSE Tumbleweed 1.26.9-1.1

opensuse advisories openSUSE-SU-2026:22095-1openSUSE-SU-2026:22093-1openSUSE-SU-2026:12112-1openSUSE-SU-2026:12101-1openSUSE-SU-2026:12093-1

  • golang AlmaLinux 10 1.26.10-1.el10_2.alma.1
  • go-toolset AlmaLinux 10 1.26.10-1.el10_2.alma.1
  • golang-bin AlmaLinux 10 1.26.10-1.el10_2.alma.1
  • golang-src AlmaLinux 10 1.26.10-1.el10_2.alma.1
  • golang-misc AlmaLinux 10 1.26.10-1.el10_2.alma.1
  • golang-race AlmaLinux 10 1.26.10-1.el10_2.alma.1
  • golang-tests AlmaLinux 10 1.26.10-1.el10_2.alma.1
  • golang AlmaLinux 9 1.26.10-1.el9_8

almalinux advisories ALSA-2026:86093ALSA-2026:86196ALSA-2026:86203

  • go Alpine 3.24 1.26.9-r0

alpine advisories ALPINE-CVE-2026-94447

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-94447 updated cvss 6.7

cmd/go: golang: cmd/go: Toolchain checksum verification bypass via crafted project configuration

  • Red Hat Exploit Intelligence exploit-intelligence/vulnerability-analysis-rhel9
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Migration Toolkit for Applications 8 mta/mta-go-external-provider-rhel9 Red Hat Enterprise Linux 8 ubi8/go-toolset Red Hat Enterprise Linux 9 ubi9/go-toolset Red Hat Enterprise Linux 10 ubi10/go-toolset
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images golang1.25 1.25.14-0.1.hum1
    affected: workaround, no fix planned “Will not fix”
  • Red Hat OpenShift Container Platform 4 openshift4/ose-operator-sdk-rhel8, openshift4/ose-operator-sdk-rhel9 Red Hat OpenShift Dev Spaces devspaces/udi-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux AppStream (v. 8) delve 1.26.1-1.module+el8.10.0+24516+40554724, golang 1.26.10-1.module+el8.10.0+25107+6b50279c, go-toolset 1.26.10-1.module+el8.10.0+25107+6b50279c, golang-bin 1.26.10-1.module+el8.10.0+25107+6b50279c, golang-src 1.26.10-1.module+el8.10.0+25107+6b50279c, golang-misc 1.26.10-1.module+el8.10.0+25107+6b50279c, +2 more
    fixed: vendor fix RHSA-2026:86203
  • Red Hat Enterprise Linux AppStream (v. 9) golang 1.26.10-1.el9_8, go-toolset 1.26.10-1.el9_8, golang-bin 1.26.10-1.el9_8, golang-src 1.26.10-1.el9_8, golang-misc 1.26.10-1.el9_8, golang-race 1.26.10-1.el9_8, +1 more
    fixed: vendor fix RHSA-2026:86196
  • Red Hat Enterprise Linux AppStream (v. 10) golang 1.26.10-1.el10_2, go-toolset 1.26.10-1.el10_2, golang-bin 1.26.10-1.el10_2, golang-src 1.26.10-1.el10_2, golang-misc 1.26.10-1.el10_2, golang-race 1.26.10-1.el10_2, +1 more
    fixed: vendor fix RHSA-2026:86093
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) delve 1.26.1-1.module+el8.4.0+25181+7ce5b91c, golang 1.26.10-2.module+el8.4.0+25201+9a419e96, go-toolset 1.26.10-2.module+el8.4.0+25201+9a419e96, golang-bin 1.26.10-2.module+el8.4.0+25201+9a419e96, golang-src 1.26.10-2.module+el8.4.0+25201+9a419e96, golang-misc 1.26.10-2.module+el8.4.0+25201+9a419e96, +2 more
    fixed: vendor fix RHSA-2026:90994
show 10 more
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) delve 1.26.1-1.module+el8.6.0+24782+a062e766, golang 1.26.10-4.module+el8.6.0+25114+90ecdb41, go-toolset 1.26.10-4.module+el8.6.0+25114+90ecdb41, golang-bin 1.26.10-4.module+el8.6.0+25114+90ecdb41, golang-src 1.26.10-4.module+el8.6.0+25114+90ecdb41, golang-misc 1.26.10-4.module+el8.6.0+25114+90ecdb41, +2 more
    fixed: vendor fix RHSA-2026:87246
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) delve 1.26.1-1.module+el8.8.0+24781+86ad105d, golang 1.26.10-4.module+el8.8.0+25113+a148ecc0, go-toolset 1.26.10-4.module+el8.8.0+25113+a148ecc0, golang-bin 1.26.10-4.module+el8.8.0+25113+a148ecc0, golang-src 1.26.10-4.module+el8.8.0+25113+a148ecc0, golang-misc 1.26.10-4.module+el8.8.0+25113+a148ecc0, +2 more
    fixed: vendor fix RHSA-2026:87245
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) golang 1.26.10-1.el9_2, go-toolset 1.26.10-1.el9_2, golang-bin 1.26.10-1.el9_2, golang-src 1.26.10-1.el9_2, golang-misc 1.26.10-1.el9_2, golang-race 1.26.10-1.el9_2, +1 more
    fixed: vendor fix RHSA-2026:87041
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) golang 1.26.10-1.el9_4, go-toolset 1.26.10-1.el9_4, golang-bin 1.26.10-1.el9_4, golang-src 1.26.10-1.el9_4, golang-misc 1.26.10-1.el9_4, golang-race 1.26.10-1.el9_4, +1 more
    fixed: vendor fix RHSA-2026:87042
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) golang 1.26.10-1.el10_0, go-toolset 1.26.10-1.el10_0, golang-bin 1.26.10-1.el10_0, golang-src 1.26.10-1.el10_0, golang-misc 1.26.10-1.el10_0, golang-race 1.26.10-1.el10_0, +1 more
    fixed: vendor fix RHSA-2026:87040
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) golang 1.26.10-1.el9_6, go-toolset 1.26.10-1.el9_6, golang-bin 1.26.10-1.el9_6, golang-src 1.26.10-1.el9_6, golang-misc 1.26.10-1.el9_6, golang-race 1.26.10-1.el9_6, +1 more
    fixed: vendor fix RHSA-2026:87043
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) delve 1.26.1-1.module+el8.4.0+25181+7ce5b91c, golang 1.26.10-2.module+el8.4.0+25201+9a419e96, go-toolset 1.26.10-2.module+el8.4.0+25201+9a419e96, golang-bin 1.26.10-2.module+el8.4.0+25201+9a419e96, golang-src 1.26.10-2.module+el8.4.0+25201+9a419e96, golang-misc 1.26.10-2.module+el8.4.0+25201+9a419e96, +2 more
    fixed: vendor fix RHSA-2026:90994
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) delve 1.26.1-1.module+el8.6.0+24782+a062e766, golang 1.26.10-4.module+el8.6.0+25114+90ecdb41, go-toolset 1.26.10-4.module+el8.6.0+25114+90ecdb41, golang-bin 1.26.10-4.module+el8.6.0+25114+90ecdb41, golang-src 1.26.10-4.module+el8.6.0+25114+90ecdb41, golang-misc 1.26.10-4.module+el8.6.0+25114+90ecdb41, +2 more
    fixed: vendor fix RHSA-2026:87246
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) delve 1.26.1-1.module+el8.8.0+24781+86ad105d, golang 1.26.10-4.module+el8.8.0+25113+a148ecc0, go-toolset 1.26.10-4.module+el8.8.0+25113+a148ecc0, golang-bin 1.26.10-4.module+el8.8.0+25113+a148ecc0, golang-src 1.26.10-4.module+el8.8.0+25113+a148ecc0, golang-misc 1.26.10-4.module+el8.8.0+25113+a148ecc0, +2 more
    fixed: vendor fix RHSA-2026:87245
  • Red Hat Hardened Images golang1.26 1.26.9-0.1.hum1, golang1.27 1.27.2-0.1.hum1, golang1.26-bin 1.26.9-0.1.hum1, golang1.26-src 1.26.9-0.1.hum1, golang1.27-bin 1.27.2-0.1.hum1, golang1.27-src 1.27.2-0.1.hum1, +4 more
    fixed: vendor fix RHSA-2026:79720

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
24 d ago

Exploit prediction

0.10% chance of exploitation in the next 30 days, higher than 0% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
OSV 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
bitnami golang
<1.26.9
>=1.27.0-0, <1.27.2
1.26.9
1.27.2
go toolchain
<1.26.9
>=1.27.0-0, <1.27.2
1.26.9
1.27.2

Affected products

  • Go toolchain cmd/go

Classification

Weakness
  • CWE-354 Improper Validation of Integrity Check Value

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.