FKIE_CVE-2026-34715

Vulnerability from fkie_nvd - Published: 2026-04-02 18:16 - Updated: 2026-04-10 16:01
Severity
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Summary
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.
References
security-advisories@github.comhttps://github.com/vshakitskiy/ewe/commit/ce4ff214d32626a10fda9398dc94a2d720e17446Patch
security-advisories@github.comhttps://github.com/vshakitskiy/ewe/releases/tag/v3.0.6Product, Release Notes
security-advisories@github.comhttps://github.com/vshakitskiy/ewe/security/advisories/GHSA-x2w3-23jr-hrpfExploit, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/vshakitskiy/ewe/security/advisories/GHSA-x2w3-23jr-hrpfExploit, Vendor Advisory
Impacted products
Vendor Product Version
vshakitskiy ewe *
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      "value": "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 \u2014 but provides no equivalent protection for outgoing response headers in the encoder. This issue has been patched in version 3.0.6."
    }
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  "id": "CVE-2026-34715",
  "lastModified": "2026-04-10T16:01:12.507",
  "metrics": {
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          "confidentialityImpact": "NONE",
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}


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