CVE-2026-32881
MEDIUMCVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Lifecycle Timeline
2Description
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.
Analysis
ewe, a Gleam web server, contains an authentication bypass vulnerability in versions 0.6.0 through 3.0.4 that exploits improper handling of chunked transfer encoding trailer headers. An unauthenticated remote attacker can declare sensitive HTTP headers in the Trailer field and append them after the final chunk to overwrite legitimate values set by reverse proxies, enabling them to forge authentication credentials, hijack sessions, bypass rate limiting, or spoof proxy-trust headers. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.
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