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CVE-2026-94444· CVE.org (no NVD analysis yet)· CNA Go

Checksum bypass for golang.org/fips140 in cmd/go

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.09% (FIRST EPSS).
  • Someone with local access to the system can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: Go toolchain cmd/go 1.26.9, 1.27.2; azl3 golang 1.26.7-1 on Azure Linux 3.0 Release Notes; azl3 golang 1.27.1-1 on Azure Linux 3.0 Release Notes.

Low priority for now. Upgrade to Go toolchain cmd/go 1.26.9, 1.27.2; azl3 golang 1.26.7-1 on Azure Linux 3.0 Release Notes; azl3 golang 1.27.1-1 on Azure Linux 3.0 Release Notes or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Previously, a user operating inside of a malicious Go project that defines a bogus golang.org/fips140 and operates a malicious GOMODPROXY the user chooses to connect to can serve an arbitrary module in its place. We now unpack the trusted ziphash for the bundled golang.org/fips140 module and construct its entry in the GOMODCACHE such that it can be verified by the toolchain.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Oct 8, 2026
Updated
Oct 15, 2026
EPSS
0.0% · 0th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.0%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-94444

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Go). Independent of NVD's CPE analysis and usually ahead of it.

  • Go toolchain cmd/go

    • before 1.26.9affected · semver
    • 1.27.0-0 and later · before 1.27.2affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12golang-1.19from 0—
Debian:13golang-1.24from 0—
Debian:14golang-1.26before 1.26.9-11.26.9-1
Debian:14golang-1.27before 1.27.2-11.27.2-1
Gotoolchainfrom 1.27.0-0 · before 1.27.21.27.2
Gotoolchainbefore 1.26.91.26.9
openSUSE:Leap 16.0go1.26before 1.26.9-160000.1.11.26.9-160000.1.1
openSUSE:Leap 16.0go1.27before 1.27.2-160000.1.11.27.2-160000.1.1
openSUSE:Tumbleweedgo1.26before 1.26.9-1.11.26.9-1.1
openSUSE:Tumbleweedgo1.27before 1.27.2-1.11.27.2-1.1
openSUSE:Tumbleweedrclonebefore 1.75.2-1.11.75.2-1.1
Red Hat:hummingbird:1golang1.26before 0:1.26.9-0.1.hum10:1.26.9-0.1.hum1
Red Hat:hummingbird:1golang1.26-binbefore 0:1.26.9-0.1.hum10:1.26.9-0.1.hum1
Red Hat:hummingbird:1golang1.26-docsbefore 0:1.26.9-0.1.hum10:1.26.9-0.1.hum1
Red Hat:hummingbird:1golang1.26-miscbefore 0:1.26.9-0.1.hum10:1.26.9-0.1.hum1
Red Hat:hummingbird:1golang1.26-srcbefore 0:1.26.9-0.1.hum10:1.26.9-0.1.hum1
Red Hat:hummingbird:1golang1.26-testsbefore 0:1.26.9-0.1.hum10:1.26.9-0.1.hum1
Red Hat:hummingbird:1golang1.27before 0:1.27.2-0.1.hum10:1.27.2-0.1.hum1
Red Hat:hummingbird:1golang1.27-binbefore 0:1.27.2-0.1.hum10:1.27.2-0.1.hum1
Red Hat:hummingbird:1golang1.27-docsbefore 0:1.27.2-0.1.hum10:1.27.2-0.1.hum1
Red Hat:hummingbird:1golang1.27-miscbefore 0:1.27.2-0.1.hum10:1.27.2-0.1.hum1
Red Hat:hummingbird:1golang1.27-srcbefore 0:1.27.2-0.1.hum10:1.27.2-0.1.hum1
Red Hat:hummingbird:1golang1.27-testsbefore 0:1.27.2-0.1.hum10:1.27.2-0.1.hum1
SUSE:Linux Enterprise Module for Development Tools 15 SP7go1.26before 1.26.9-150000.1.33.11.26.9-150000.1.33.1

+3

Same product

go toolchain: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-24531Output of "go env" does not sanitize values in cmd/go
    39Monitor
  • CVE-2024-45340GOAUTH credential leak in cmd/go
    35Monitor
  • CVE-2026-56865Fix transparency log tile verification bypass in golang.org/x/mod/sumdb/tlog
    33Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2025-22867Feb 6, 2025 · Arbitrary code execution during build on darwin in cmd/go
    30Monitor
  • ← EarlierCVE-2026-56864Aug 13, 2026 · Ignore unrelated, unauthenticated hashes in Lookup in golang.org/x/mod/sumdb
    30Monitor
  • Later →CVE-2026-94447Oct 8, 2026 · Checksum database bypass for golang.org/toolchain in cmd/go
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Go toolchain cmd/go1.26.9Vendor (CNA)
Go toolchain cmd/go1.27.2Vendor (CNA)
azl3 golang 1.26.7-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 golang 1.27.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
debian:golang-1.261.26.9-1 · Debian:14Package registry (OSV)
debian:golang-1.271.27.2-1 · Debian:14Package registry (OSV)
Go:toolchain1.26.9Package registry (OSV)
Go:toolchain1.27.2Package registry (OSV)
opensuse:go1.261.26.9-1.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:go1.271.27.2-1.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:rclone1.75.2-1.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:golang1.260:1.26.9-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:golang1.26-bin0:1.26.9-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:golang1.26-docs0:1.26.9-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:golang1.26-misc0:1.26.9-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:golang1.26-src0:1.26.9-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:golang1.26-tests0:1.26.9-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:golang1.270:1.27.2-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:golang1.27-bin0:1.27.2-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:golang1.27-docs0:1.27.2-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:golang1.27-misc0:1.27.2-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:golang1.27-src0:1.27.2-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:golang1.27-tests0:1.27.2-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
suse:go1.261.26.9-150000.1.33.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP7Package registry (OSV)
suse:go1.261.26.9-160000.1.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:go1.271.27.2-150000.1.12.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP7Package registry (OSV)
suse:go1.271.27.2-160000.1.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayOct 24, 2026+15 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-944470 days apartChecksum database bypass for golang.org/toolchain in cmd/go
    31Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-354 · Improper Validation of Integrity Check Value

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. CVSS— → 7.8
  2. Severity— → high
  3. SSVC exploitation— → none
  4. Exploit maturity— → none
  5. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records