AnyIO: TLSStream IDNA 2003 host name encoding enables potential TLS certificate spoofing
Critical vendor advisory
CVE-2026-63374
Summary
AnyIO: TLSStream IDNA 2003 host name encoding enables potential TLS certificate spoofing
Why it matters
GitHub has published a reviewed security advisory for anyio. Prioritize it with other application dependency updates.
Operator check
Check whether anyio is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. CVSS score: 9.3.
Sources
PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.