{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-34715","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-03-30T18:41:20.752Z","datePublished":"2026-04-02T17:57:00.501Z","dateUpdated":"2026-04-03T16:00:41.121Z"},"containers":{"cna":{"title":"ewe Has Improper Neutralization of CRLF Sequences in HTTP Headers (HTTP Request/Response Splitting)","problemTypes":[{"descriptions":[{"cweId":"CWE-113","lang":"en","description":"CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"}}],"references":[{"name":"https://github.com/vshakitskiy/ewe/security/advisories/GHSA-x2w3-23jr-hrpf","tags":["x_refsource_CONFIRM"],"url":"https://github.com/vshakitskiy/ewe/security/advisories/GHSA-x2w3-23jr-hrpf"},{"name":"https://github.com/vshakitskiy/ewe/commit/ce4ff214d32626a10fda9398dc94a2d720e17446","tags":["x_refsource_MISC"],"url":"https://github.com/vshakitskiy/ewe/commit/ce4ff214d32626a10fda9398dc94a2d720e17446"},{"name":"https://github.com/vshakitskiy/ewe/releases/tag/v3.0.6","tags":["x_refsource_MISC"],"url":"https://github.com/vshakitskiy/ewe/releases/tag/v3.0.6"}],"affected":[{"vendor":"vshakitskiy","product":"ewe","versions":[{"version":"< 3.0.6","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-04-02T17:57:00.501Z"},"descriptions":[{"lang":"en","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 — but provides no equivalent protection for outgoing response headers in the encoder. This issue has been patched in version 3.0.6."}],"source":{"advisory":"GHSA-x2w3-23jr-hrpf","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/vshakitskiy/ewe/security/advisories/GHSA-x2w3-23jr-hrpf","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-03T16:00:11.591060Z","id":"CVE-2026-34715","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-04-03T16:00:41.121Z"}}]}}