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Back to active CVEs
Unknown severity · Source severity not reportedCVE-2026-94447

Checksum database bypass for golang.org/toolchain in cmd/goCVE-2026-94447

Answer in brief

CVE-2026-94447 records a Unknown severity vulnerability in Checksum database bypass for golang.org/toolchain in cmd/go. The current sources do not mark it as known exploited. The current feed maps Go toolchain/cmd/go (generic), toolchain (go). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 8, 2026Updated Oct 8, 2026Source checked Oct 9, 2026First seen by HOL Oct 8, 2026Material review Oct 8, 2026
Upstream Advisory

Key facts

Risk
Unknown severitySource severity not reported
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Go toolchain/cmd/go (generic), toolchain (go). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Go toolchain/cmd/gogeneric>=0 <1.26.9 || >=1.27.0-0 <1.27.21.26.9, 1.27.2
toolchaingo>=0 <1.26.9 >=1.27.0-0 <1.27.21.26.9, 1.27.2

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Go toolchain/cmd/go, toolchain.
  2. 2Review the reported fix. Update Go toolchain/cmd/go to 1.26.9; toolchain to 1.26.9 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 8, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 8, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 8, 2026

Sources and claim methodology

  • Source referencego.dev
  • Source referencego.dev
  • Source referencegroups.google.com
  • Source referencepkg.go.dev
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Checksum bypass for golang.org/fips140 in cmd/goSame go toolchain/cmd/go package
  • Jivejdon through 5.0 SQL Injection via username in userListActionSame generic ecosystem
  • Unauthenticated JSON API Authorization Bypass Vulnerability in TP-Link Tapo C325WBSame generic ecosystem
  • Unauthenticated RTSP Tunnel Denial-of-Service Vulnerability in TP-Link Tapo C325WBSame generic ecosystem
  • Predictable Media Stream Pre-Shared Key Vulnerability in TP-Link Tapo C325WBSame generic ecosystem
  • Eog: eog: arbitrary code execution via heap buffer overflow in png metadata readerSame generic ecosystem

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-354
Source
CVE List V5
Source checked
Oct 9, 2026
References
4 linked sources
Open source record