Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Vshakitskiy | Ewe | < 3.0.5 |
Related Weaknesses (CWE)
References
- https://github.com/vshakitskiy/ewe/commit/07dcfd2135fc95f38c17a9d030de3d7efee1eePatch
- https://github.com/vshakitskiy/ewe/commit/94ab6e7bf7293e987ae98b4daa51ea131c2671Patch
- https://github.com/vshakitskiy/ewe/releases/tag/v3.0.5PatchProduct
- https://github.com/vshakitskiy/ewe/security/advisories/GHSA-9w88-79f8-m3vpExploitMitigationVendor Advisory
FAQ
What is CVE-2026-32881?
CVE-2026-32881 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 me...
How severe is CVE-2026-32881?
CVE-2026-32881 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-32881?
Check the references section above for vendor advisories and patch information. Affected products include: Vshakitskiy Ewe.