Vulnerability Details CVE-2026-32881
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 30.3%
CVSS Severity
CVSS v3 Score 5.3
References
Products affected by CVE-2026-32881
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cpe:2.3:a:vshakitskiy:ewe:0.0.1
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cpe:2.3:a:vshakitskiy:ewe:0.0.2
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cpe:2.3:a:vshakitskiy:ewe:0.1.0
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cpe:2.3:a:vshakitskiy:ewe:0.10.0
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cpe:2.3:a:vshakitskiy:ewe:0.2.0
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cpe:2.3:a:vshakitskiy:ewe:0.3.0
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cpe:2.3:a:vshakitskiy:ewe:0.4.0
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cpe:2.3:a:vshakitskiy:ewe:0.5.0
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cpe:2.3:a:vshakitskiy:ewe:0.6.0
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cpe:2.3:a:vshakitskiy:ewe:0.7.0
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cpe:2.3:a:vshakitskiy:ewe:0.8.0
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cpe:2.3:a:vshakitskiy:ewe:0.8.1
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cpe:2.3:a:vshakitskiy:ewe:0.9.0
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cpe:2.3:a:vshakitskiy:ewe:1.0.0
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cpe:2.3:a:vshakitskiy:ewe:1.0.1
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cpe:2.3:a:vshakitskiy:ewe:2.0.0
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cpe:2.3:a:vshakitskiy:ewe:2.0.1
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cpe:2.3:a:vshakitskiy:ewe:2.0.2
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cpe:2.3:a:vshakitskiy:ewe:2.0.3
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cpe:2.3:a:vshakitskiy:ewe:2.1.0
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cpe:2.3:a:vshakitskiy:ewe:2.1.1
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cpe:2.3:a:vshakitskiy:ewe:2.1.2
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cpe:2.3:a:vshakitskiy:ewe:2.1.3
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cpe:2.3:a:vshakitskiy:ewe:3.0.0
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cpe:2.3:a:vshakitskiy:ewe:3.0.1
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cpe:2.3:a:vshakitskiy:ewe:3.0.2
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cpe:2.3:a:vshakitskiy:ewe:3.0.3
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cpe:2.3:a:vshakitskiy:ewe:3.0.4