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CVE-2026-42501

A malicious module proxy can exploit a flaw in the go command's validation of module checksums to bypass checksum database validation. This vulnerability affects any user using an untrusted module proxy (GOMODPROXY) or checksum database (GOSUMDB). A malicious module proxy can serve altered versions of the Go toolchain. When selecting a different version of the Go toolchain than the currently installed toolchain (due to the GOTOOLCHAIN environment variable, or a go.work or go.mod with a toolchain
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:45db55d06f9e26839d2c6bd36b3fb8c006c9a4bf04a42902f3d6b083cdb4ab58
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-347","description":"CWE-347 Improper Verification of Cryptographic Signature","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e32be032e9c18172ac2f0e96cc6067a83d62d541e57ab604cc4cf3f408970c9c · sha256:45b07f9345979502… · /containers/adp/0/problemTypes/0/descriptions/0

{"description":"CWE-347: Improper Verification of Cryptographic Signature","lang":"en"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e32be032e9c18172ac2f0e96cc6067a83d62d541e57ab604cc4cf3f408970c9c · sha256:45b07f9345979502… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"collectionURL":"https://pkg.go.dev","defaultStatus":"unaffected","packageName":"cmd/go","product":"cmd/go","vendor":"Go toolchain","versions":[{"lessThan":"1.25.10","status":"affected","version":"0","versionType":"semver"},{"lessThan":"1.26.3","status":"affected","version":"1.26.0-0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:e32be032e9c18172ac2f0e96cc6067a83d62d541e57ab604cc4cf3f408970c9c · sha256:45b07f9345979502… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:e32be032e9c18172ac2f0e96cc6067a83d62d541e57ab604cc4cf3f408970c9c · sha256:45b07f9345979502… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-347","description":"CWE-347 Improper Verification of Cryptographic Signature","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e32be032e9c18172ac2f0e96cc6067a83d62d541e57ab604cc4cf3f408970c9c · sha256:45b07f9345979502… · /containers/adp/0/problemTypes/0/descriptions/0
{"description":"CWE-347: Improper Verification of Cryptographic Signature","lang":"en"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e32be032e9c18172ac2f0e96cc6067a83d62d541e57ab604cc4cf3f408970c9c · sha256:45b07f9345979502… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"url":"https://go.dev/cl/775321"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e32be032e9c18172ac2f0e96cc6067a83d62d541e57ab604cc4cf3f408970c9c · sha256:45b07f9345979502… · /containers/cna/references/0
{"url":"https://go.dev/issue/79070"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e32be032e9c18172ac2f0e96cc6067a83d62d541e57ab604cc4cf3f408970c9c · sha256:45b07f9345979502… · /containers/cna/references/1
{"url":"https://groups.google.com/g/golang-announce/c/qcCIEXso47M"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e32be032e9c18172ac2f0e96cc6067a83d62d541e57ab604cc4cf3f408970c9c · sha256:45b07f9345979502… · /containers/cna/references/2
{"url":"https://pkg.go.dev/vuln/GO-2026-4984"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e32be032e9c18172ac2f0e96cc6067a83d62d541e57ab604cc4cf3f408970c9c · sha256:45b07f9345979502… · /containers/cna/references/3

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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