CVE-2026-42544

Summary

Granian is a Rust HTTP server for Python applications. From 1.2.0 to 2.7.4, Granian aborts a worker process when an unauthenticated client sends a WebSocket upgrade request whose Sec-WebSocket-Protocol header contains non-ASCII bytes. The crash happens in Granian's WebSocket scope construction path, before the ASGI application is invoked. This vulnerability is fixed in 2.7.4.

Affected Software

VendorProductVersion RangeStatus
emmett-frameworkgranian>= 1.2.0, < 2.7.4affected

Weaknesses

  • CWE-20: CWE-20: Improper Input Validation
  • CWE-248: CWE-248: Uncaught Exception
  • CWE-400: CWE-400: Uncontrolled Resource Consumption

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: poc
    • Automatable: yes
    • Technical Impact: partial

Additional References

References