Vulnerability Details CVE-2026-32873
ewe is a Gleam web server. Versions 0.8.0 through 3.0.4 contain a bug in the handle_trailers function where rejected trailer headers (forbidden or undeclared) cause an infinite loop. When handle_trailers encounters such a trailer, three code paths (lines 520, 523, 526) recurse with the original buffer (rest) instead of advancing past the rejected header (Buffer(header_rest, 0)), causing decoder.decode_packet to re-parse the same header on every iteration. The resulting loop has no timeout or escape — the BEAM process permanently wedges at 100% CPU. Any application that calls ewe.read_body on chunked requests is affected, and this is exploitable by any unauthenticated remote client before control returns to application code, making an application-level workaround impossible. This issue is fixed in version 3.0.5.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.006
EPSS Ranking 44.0%
CVSS Severity
CVSS v3 Score 7.5
References
- https://github.com/vshakitskiy/ewe/commit/8513de9dcdd0005f727c0f6f15dd89f8d626f560
- https://github.com/vshakitskiy/ewe/commit/d8b9b8a86470c0cb5696647997c2f34763506e37
- https://github.com/vshakitskiy/ewe/security/advisories/GHSA-4w98-xf39-23gp
- https://github.com/vshakitskiy/ewe/security/advisories/GHSA-4w98-xf39-23gp
Products affected by CVE-2026-32873
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cpe:2.3:a:vshakitskiy:ewe:0.10.0
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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