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TI-2026-28700 Aliases CVE-2026-39817GHSA-qc64-m6c2-v4x7

Invoking "go tool pack" does not sanitize output paths in cmd/go

Priority LOW 26CWE-787Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
Required
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · High · None
Fix status
Partial Red Hat: 10 fixed, 4 without a fix

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

Summary

The "go tool pack" subcommand (usually used only by the compiler as an internal tool with known-good inputs) does not sanitize output filenames. Extracting a malicious archive file with the "pack" subcommand can write files to arbitrary locations on the filesystem.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0017 6th percentileScored 2026-11-07
Fix Partial cmd/go (Go toolchain): 1.25.10, 1.26.3Red Hat: 11 advisoriesRed Hat: 10 fixed, 4 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

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 1.25.10; 1.26.0-0 to before 1.26.31.25.10, 1.26.3Patch availableCNA
  • cmd/go VendorGo standard library Affected before 1.25.10; 1.26.0-0 to before 1.26.3 Fixed in 1.25.10, 1.26.3 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*before 1.25.10; 1.26.0 to before 1.26.3VulnerableGo standard library
  • cpe:2.3:a:golang:go:*:*:*:*:*:*:*:* Versions before 1.25.10; 1.26.0 to before 1.26.3 Vulnerable ·Go standard library

Remediation

  • Fix · CNA cmd/go (Go toolchain) Fixed in 1.25.10, 1.26.3

Red Hat 11 advisories

  • RHSA-2026:66561 Released 2026-09-11 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images golang1.27-1.27.1-0.1.hum1@aarch64, golang1.27-1.27.1-0.1.hum1@src, golang1.27-1.27.1-0.1.hum1@x86_64 +10
  • RHSA-2026:62391 Released 2026-09-02 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images golang1.26-1.26.8-0.1.hum1@aarch64, golang1.26-1.26.8-0.1.hum1@src, golang1.26-1.26.8-0.1.hum1@x86_64 +10
  • RHSA-2026:61253 Released 2026-08-31 · Red Hat rating Important
    golang security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) go-toolset-1.26.5-1.el9_2, golang-1.26.5-1.el9_2, golang-bin-1.26.5-1.el9_2 +5
Show 8 more Red Hat advisories
  • RHSA-2026:57649 Released 2026-08-20 · Red Hat rating Important
    golang security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) go-toolset-1.26.5-1.el9_4, golang-1.26.5-1.el9_4, golang-bin-1.26.5-1.el9_4 +5
  • RHSA-2026:57194 Released 2026-08-19 · Red Hat rating Important
    multicluster engine for Kubernetes v2.11.5 security update
    • multicluster engine for Kubernetes 2.11 registry.redhat.io/multicluster-engine/addon-manager-rhel9, registry.redhat.io/multicluster-engine/backplane-rhel9-operator, registry.redhat.io/multicluster-engine/cluster-api-provider-kubevirt-rhel9 +11
  • RHSA-2026:49712 Released 2026-08-03 · Red Hat rating Important
    golang security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) go-toolset-1.26.5-1.el9_6, golang-1.26.5-1.el9_6, golang-bin-1.26.5-1.el9_6 +5
  • RHSA-2026:49702 Released 2026-08-03 · Red Hat rating Important
    golang security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) go-toolset-1.26.5-1.el10_0, golang-1.26.5-1.el10_0, golang-bin-1.26.5-1.el10_0 +5
  • RHSA-2026:43692 Released 2026-07-22 · Red Hat rating Important
    Red Hat OpenShift API for Data Protection
    • OpenShift API for Data Protection 1.6 registry.redhat.io/oadp/oadp-velero-rhel9
  • RHSA-2026:22112 Released 2026-06-01 · Red Hat rating Important
    go-toolset:rhel8 security update
    • Red Hat Enterprise Linux AppStream (v. 8) delve-1.25.2-1.module+el8.10.0+23746+9db33b5e.aarch64::go-toolset:rhel8, delve-1.25.2-1.module+el8.10.0+23746+9db33b5e.ppc64le::go-toolset:rhel8, delve-1.25.2-1.module+el8.10.0+23746+9db33b5e.src::go-toolset:rhel8 +22
  • RHSA-2026:22121 Released 2026-06-01 · Red Hat rating Important
    golang security update
    • Red Hat Enterprise Linux AppStream (v. 9) go-toolset-1.26.3-1.el9_8, golang-1.26.3-1.el9_8, golang-bin-1.26.3-1.el9_8 +5
  • RHSA-2026:22120 Released 2026-06-01 · Red Hat rating Important
    golang security update
    • Red Hat Enterprise Linux AppStream (v. 10) go-toolset-1.26.3-4.el10_2, golang-1.26.3-4.el10_2, golang-bin-1.26.3-4.el10_2 +5

Fixed in the same release

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

  • Release ·

    Go toolchain cmd/go 1.25.10, 1.26.3

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2026-30784 Malicious module proxy can bypass checksum database in cmd/goPriority LOW 34
    • TI-2026-28701 Invoking "go bug" follows symlinks in predictable temporary filenames in cmd/goPriority LOW 23
    Show all 3 records →

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Multicluster Engine for KubernetesAffected—
Red Hat Advanced Cluster Management for Kubernetes 2Affected—
Red Hat Hardened ImagesAffectedNo fix planned: Will not fix
Red Hat OpenShift Container Platform 4Affected—
OpenShift API for Data Protection 1.6Fixed RHSA-2026:43692
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:22120
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:22112
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:22121
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:61253
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:57649
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:49702
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:49712
Red Hat Hardened ImagesFixed RHSA-2026:62391, RHSA-2026:66561
multicluster engine for Kubernetes 2.11Fixed RHSA-2026:57194
Not affected: 2 products
  • OpenShift API for Data Protection 1.6
  • multicluster engine for Kubernetes 2.11

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-39817
  2. 2026-10-03 Alias added: GHSA-qc64-m6c2-v4x7

References

Patch 1

Advisory 1

Other 2

  • 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-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-2018-12083 Improper input validation in [UNKNOWN] golang CVSS 3.1HIGH 8.1
  • TI-2024-16306 Mishandling of corrupt central directory record in archive/zip CVSS 3.1MEDIUM 5.5
  • TI-2021-15910 Go before 1.16.9 and 1.17.x before 1.17.2 has a Buffer Overflow via large arguments in a… CVSS 3.1CRITICAL 9.8
See all 170 →

Sources

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