Vulnerability Description
ewe is a Gleam web server. Prior to version 3.0.6, the encode_headers function in src/ewe/internal/encoder.gleam directly interpolates response header keys and values into raw HTTP bytes without validating or stripping CRLF (\r\n) sequences. An application that passes user-controlled data into response headers (e.g., setting a Location redirect header from a request parameter) allows an attacker to inject arbitrary HTTP response content, leading to response splitting, cache poisoning, and possible cross-site scripting. Notably, ewe does validate CRLF in incoming request headers via validate_field_value() in the HTTP/1.1 parser — but provides no equivalent protection for outgoing response headers in the encoder. This issue has been patched in version 3.0.6.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Vshakitskiy | Ewe | < 3.0.6 |
Related Weaknesses (CWE)
References
- https://github.com/vshakitskiy/ewe/commit/ce4ff214d32626a10fda9398dc94a2d720e174Patch
- https://github.com/vshakitskiy/ewe/releases/tag/v3.0.6ProductRelease Notes
- https://github.com/vshakitskiy/ewe/security/advisories/GHSA-x2w3-23jr-hrpfExploitVendor Advisory
- https://github.com/vshakitskiy/ewe/security/advisories/GHSA-x2w3-23jr-hrpfExploitVendor Advisory
FAQ
What is CVE-2026-34715?
CVE-2026-34715 is a vulnerability with a CVSS score of 5.3 (MEDIUM). ewe is a Gleam web server. Prior to version 3.0.6, the encode_headers function in src/ewe/internal/encoder.gleam directly interpolates response header keys and values into raw HTTP bytes without valid...
How severe is CVE-2026-34715?
CVE-2026-34715 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-2026-34715?
Check the references section above for vendor advisories and patch information. Affected products include: Vshakitskiy Ewe.