{"cve":"CVE-2026-69201","nvd":{"published":"2026-09-15T19:17:37.423","modified":"2026-09-16T20:38:04.943","status":"Deferred","description":"Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, ResourceService and WebjarService decode each URL path segment but reject only segments exactly equal to an empty string, a dot, or two dots. A request containing percent-encoded slash or backslash separators can turn an accepted segment into a parent-directory traversal after decoding, allowing access to classpath or WebJar resources outside the configured base when a directory-backed classpath is served and the backend preserves the encoded separator. The patch rejects decoded segments containing slash or backslash in ResourceService and WebjarService, and applies the same guard to the non-exploitable FileService for consistency. This issue is fixed in versions 0.23.35 and 1.0.0-M47.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","score":5.9},"cwes":["CWE-22"],"references":["https://github.com/http4s/http4s/commit/bcd99cdc1342ef58a0f132acb814af06a668a8d3","https://github.com/http4s/http4s/releases/tag/v0.23.35","https://github.com/http4s/http4s/releases/tag/v1.0.0-M47","https://github.com/http4s/http4s/security/advisories/GHSA-crq5-92j2-j7wv"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:54:41.405518556+00:00"},"epss":{"cve":"CVE-2026-69201","score":0.00758,"percentile":0.5523,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-crq5-92j2-j7wv","url":"https://osv.dev/vulnerability/GHSA-crq5-92j2-j7wv","summary":"Http4s: ResourceService and Webjar Service path escape via percent-encoded separators","modified":"2026-09-15T20:15:05.103669257Z","packages":[{"ecosystem":"Maven","name":"org.http4s:http4s-server_2.12","purl":"pkg:maven/org.http4s/http4s-server_2.12","ranges":["<0.23.35"],"fixed":["0.23.35"]},{"ecosystem":"Maven","name":"org.http4s:http4s-server_2.13","purl":"pkg:maven/org.http4s/http4s-server_2.13","ranges":["<0.23.35"],"fixed":["0.23.35"]},{"ecosystem":"Maven","name":"org.http4s:http4s-server_3","purl":"pkg:maven/org.http4s/http4s-server_3","ranges":["<0.23.35"],"fixed":["0.23.35"]},{"ecosystem":"Maven","name":"org.http4s:http4s-server_3","purl":"pkg:maven/org.http4s/http4s-server_3","ranges":[">=1.0.0-M1 <1.0.0-M47"],"fixed":["1.0.0-M47"]},{"ecosystem":"Maven","name":"org.http4s:http4s-server_2.13","purl":"pkg:maven/org.http4s/http4s-server_2.13","ranges":[">=1.0.0-M1 <1.0.0-M47"],"fixed":["1.0.0-M47"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}