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TI-2026-69835 Aliases CVE-2026-94447GHSA-cgx4-3g64-rvr7

Checksum verification bypass for golang.org/toolchain in Go cmd/go

Priority LOW 35CWE-354Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 14 fixed, 8 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat.

Summary

The Go toolchain cmd/go is affected from 0 before 1.26.9 and from 1.27.0-0 before 1.27.2. It fails to validate the checksum for golang.org/toolchain (CWE-354). A user working in a malicious Go project that defines a bogus go.sum entry, and who chooses to use a malicious GOMODPROXY, can bypass the intended checksum.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00102 0th percentileScored 2026-11-07
Fix Partial cmd/go (Go toolchain): 1.26.9, 1.27.2Red Hat: 12 advisoriesRed Hat: 14 fixed, 8 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Go standard librarycmd/gobefore 1.26.9; 1.27.0-0 to before 1.27.21.26.9, 1.27.2Patch availableCNA
  • cmd/go VendorGo standard library Affected before 1.26.9; 1.27.0-0 to before 1.27.2 Fixed in 1.26.9, 1.27.2 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*——Go standard library

Remediation

Upgrade cmd/go to 1.26.9 or 1.27.2. Red Hat fixes it in RHSA-2026:90994, RHSA-2026:87245, RHSA-2026:87246, RHSA-2026:87043, RHSA-2026:87042, RHSA-2026:87041, RHSA-2026:87040, RHSA-2026:86196, RHSA-2026:86203, RHSA-2026:86093, RHSA-2026:79720 and RHSA-2026:79715. Red Hat has no fix available yet for Red Hat Enterprise Linux 8, 9 and 10, Migration Toolkit for Applications 8, OpenShift Container Platform 4 and OpenShift Dev Spaces.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA cmd/go (Go toolchain) Fixed in 1.26.9, 1.27.2

Red Hat 12 advisories

  • RHSA-2026:90994 Released 2026-10-27 · Red Hat rating Important
    go-toolset:rhel8 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) delve-1.26.1-1.module+el8.4.0+25181+7ce5b91c.src::go-toolset:rhel8, delve-1.26.1-1.module+el8.4.0+25181+7ce5b91c.x86_64::go-toolset:rhel8, go-toolset-1.26.10-2.module+el8.4.0+25201+9a419e96.x86_64::go-toolset:rhel8 +8
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) delve-1.26.1-1.module+el8.4.0+25181+7ce5b91c.src::go-toolset:rhel8, delve-1.26.1-1.module+el8.4.0+25181+7ce5b91c.x86_64::go-toolset:rhel8, go-toolset-1.26.10-2.module+el8.4.0+25201+9a419e96.x86_64::go-toolset:rhel8 +8
  • RHSA-2026:87245 Released 2026-10-21 · Red Hat rating Important
    go-toolset:rhel8 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) delve-1.26.1-1.module+el8.8.0+24781+86ad105d.ppc64le::go-toolset:rhel8, delve-1.26.1-1.module+el8.8.0+24781+86ad105d.src::go-toolset:rhel8, delve-1.26.1-1.module+el8.8.0+24781+86ad105d.x86_64::go-toolset:rhel8 +13
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) delve-1.26.1-1.module+el8.8.0+24781+86ad105d.src::go-toolset:rhel8, delve-1.26.1-1.module+el8.8.0+24781+86ad105d.x86_64::go-toolset:rhel8, go-toolset-1.26.10-4.module+el8.8.0+25113+a148ecc0.x86_64::go-toolset:rhel8 +8
  • RHSA-2026:87246 Released 2026-10-21 · Red Hat rating Important
    go-toolset:rhel8 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) delve-1.26.1-1.module+el8.6.0+24782+a062e766.src::go-toolset:rhel8, delve-1.26.1-1.module+el8.6.0+24782+a062e766.x86_64::go-toolset:rhel8, go-toolset-1.26.10-4.module+el8.6.0+25114+90ecdb41.x86_64::go-toolset:rhel8 +8
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) delve-1.26.1-1.module+el8.6.0+24782+a062e766.src::go-toolset:rhel8, delve-1.26.1-1.module+el8.6.0+24782+a062e766.x86_64::go-toolset:rhel8, go-toolset-1.26.10-4.module+el8.6.0+25114+90ecdb41.x86_64::go-toolset:rhel8 +8
Show 9 more Red Hat advisories
  • RHSA-2026:87043 Released 2026-10-21 · Red Hat rating Important
    golang security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) go-toolset-1.26.10-1.el9_6, golang-1.26.10-1.el9_6, golang-bin-1.26.10-1.el9_6 +5
  • RHSA-2026:87042 Released 2026-10-21 · Red Hat rating Important
    golang security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) go-toolset-1.26.10-1.el9_4, golang-1.26.10-1.el9_4, golang-bin-1.26.10-1.el9_4 +5
  • RHSA-2026:87041 Released 2026-10-21 · Red Hat rating Important
    golang security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) go-toolset-1.26.10-1.el9_2, golang-1.26.10-1.el9_2, golang-bin-1.26.10-1.el9_2 +5
  • RHSA-2026:87040 Released 2026-10-21 · Red Hat rating Important
    golang security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) go-toolset-1.26.10-1.el10_0, golang-1.26.10-1.el10_0, golang-bin-1.26.10-1.el10_0 +5
  • RHSA-2026:86196 Released 2026-10-20 · Red Hat rating Important
    golang security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) go-toolset-1.26.10-1.el9_8, golang-1.26.10-1.el9_8, golang-bin-1.26.10-1.el9_8 +5
  • RHSA-2026:86203 Released 2026-10-20 · Red Hat rating Important
    go-toolset:rhel8 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 8) delve-1.26.1-1.module+el8.10.0+24516+40554724.aarch64::go-toolset:rhel8, delve-1.26.1-1.module+el8.10.0+24516+40554724.ppc64le::go-toolset:rhel8, delve-1.26.1-1.module+el8.10.0+24516+40554724.src::go-toolset:rhel8 +22
  • RHSA-2026:86093 Released 2026-10-20 · Red Hat rating Important
    golang security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 10) go-toolset-1.26.10-1.el10_2, golang-1.26.10-1.el10_2, golang-bin-1.26.10-1.el10_2 +5
  • RHSA-2026:79720 Released 2026-10-09 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images golang1.26-1.26.9-0.1.hum1@aarch64, golang1.26-1.26.9-0.1.hum1@src, golang1.26-1.26.9-0.1.hum1@x86_64 +14
  • RHSA-2026:79715 Released 2026-10-08 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images golang1.27-1.27.2-0.1.hum1@aarch64, golang1.27-1.27.2-0.1.hum1@src, golang1.27-1.27.2-0.1.hum1@x86_64 +14

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Go toolchain cmd/go 1.26.9, 1.27.2

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2026-69834 Checksum bypass in Go cmd/go lets attackers substitute a modulePriority LOW 35
    Show all 2 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Exploit IntelligenceAffectedNo fix planned: Out of support scope
Migration Toolkit for Applications 8AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred
Red Hat Hardened ImagesAffectedNo fix planned: Will not fix
Red Hat OpenShift Container Platform 4AffectedNo fix yet: Fix deferred
Red Hat OpenShift Dev SpacesAffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:86093
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:86203
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:86196
Red Hat Enterprise Linux AppStream AUS (v.8.4)Fixed RHSA-2026:90994
Red Hat Enterprise Linux AppStream AUS (v.8.6)Fixed RHSA-2026:87246
Red Hat Enterprise Linux AppStream E4S (v.8.8)Fixed RHSA-2026:87245
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:87041
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:87042
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:87040
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:87043
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)Fixed RHSA-2026:90994
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6)Fixed RHSA-2026:87246
Red Hat Enterprise Linux AppStream TUS (v.8.8)Fixed RHSA-2026:87245
Red Hat Hardened ImagesFixed RHSA-2026:79715, RHSA-2026:79720

Timeline

  1. 2026-10-09 Threatist record created from CVE-2026-94447
  2. 2026-10-10 Affected versions changed · Red Hat
  3. 2026-10-10 Fix available: RHSA-2026:79720 · Red Hat
  4. 2026-10-16 Alias added: GHSA-cgx4-3g64-rvr7
  5. 2026-10-16 CVSS score added · CISA ADP
  6. 2026-10-16 Weakness changed · CISA ADP
  7. 2026-10-16 CISA SSVC decision points changed
  8. 2026-10-23 Fix available: RHSA-2026:87246 · Red Hat
  9. 2026-10-23 Fix available: RHSA-2026:86093 · Red Hat
  10. 2026-10-23 Fix available: RHSA-2026:86196 · Red Hat
  11. 2026-10-23 Fix available: RHSA-2026:86203 · Red Hat
  12. 2026-10-23 Fix available: RHSA-2026:87042 · Red Hat
  13. 2026-10-23 Fix available: RHSA-2026:87040 · Red Hat
  14. 2026-10-23 Fix available: RHSA-2026:87041 · Red Hat
  15. 2026-10-23 Fix available: RHSA-2026:87043 · Red Hat
  16. 2026-10-23 Fix available: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux AppStream (v. 9) +6 · Red Hat
  17. 2026-10-24 Fix available: RHSA-2026:87245 · Red Hat
  18. 2026-10-24 Fix available: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8) · Red Hat
  19. 2026-10-29 Fix available: RHSA-2026:90994 · Red Hat
  20. 2026-10-29 Fix available: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) · Red Hat

References

Other 4

  • TI-2020-00578 Improper certificate validation in Microsoft Windows KEVCVSS 3.1HIGH 8.1
  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2023-24278 HTTP/2 CONTINUATION flood in net/http CVSS 3.1HIGH 7.5
  • TI-2018-05208 The "go get" implementation in Go 1.9.4, when the -insecure command-line option is used… CVSS 3.1HIGH 8.8
  • TI-2024-16309 Panic when parsing invalid palette-color images in golang.org/x/image CVSS 3.1HIGH 7.5
  • TI-2022-20112 Request smuggling due to improper request handling in golang.org/x/net/http2/h2c CVSS 3.1HIGH 7.5
See all 297 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences