GHSA-637q-m772-j8h6

GHSA-637q-m772-j8h6 PUBLISHED CVSS 7.800000190734863 HIGH

Record from GitHub Advisory Database · Published January 13, 2026

Time-of-check time-of-use (toctou) race condition in Windows Kernel Memory allows an authorized attacker to elevate privileges locally.

Risk scores

CVSS 3.1

7.800000190734863

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

Timeline

Jan 13, 2026 CVE Published
Apr 10, 2026 Security Advisory

Query this with the API

The same record, from the CLI:

vulnetix vdb vuln GHSA-637q-m772-j8h6
vulnetix vdb fixes GHSA-637q-m772-j8h6

Or with curl, using the org id and key from your account page:

curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
  "https://api.vdb.vulnetix.com/v2/vuln/GHSA-637q-m772-j8h6/fixes/registry"

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References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20809 url
https://nvd.nist.gov/vuln/detail/CVE-2026-20809 advisory

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