CVE-2026-32881: Vshakitskiy Ewe

Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days.

ewe is a Gleam web server. ewe is a Gleam web server. Versions 0.6.0 through 3.0.4 are vulnerable to authentication bypass or spoofed proxy-trust headers. Chunked transfer encoding trailer handling merges declared trailer fields into req.headers after body parsing, but the denylist only blocks 9 header names. A malicious client can exploit this by declaring these headers in the Trailer field and appending them after the final chunk, causing request.set_header to overwrite legitimate values (e.g., those set by a reverse proxy). This enables attackers to forge authentication credentials, hijack sessions, bypass IP-based rate limiting, or spoof proxy-trust headers in any downstream middleware that reads headers after ewe.read_body is called. This issue has been fixed in version 3.0.5.

Affected products

• Vshakitskiy Ewe: before 3.0.5 (fixed in 3.0.5)

Published 2026-03-20. Last modified 2026-06-17.