CVE-2026-32873 (GCVE-0-2026-32873)

Vulnerability from cvelistv5 – Published: 2026-03-20 01:13 – Updated: 2026-03-20 18:08
VLAI
Title
ewe: Loop with Unreachable Exit Condition ('Infinite Loop')
Summary
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-20 16:56 UTC
CWE
  • CWE-825 - Expired Pointer Dereference
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
vshakitskiy ewe Affected: >= 0.8.0, < 3.0.5
Create a notification for this product.
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