{"schema_version":1,"title":"Http4s vulnerabilities","summary":"Junglewise Threat Intelligence has tracked 26 vulnerabilities in Http4s: 1 in the last 7 days and 26 in the last 90 days, 2 of them critical and 0 exploited in the wild. The most recent, CVE-2026-61741, was published on 24 September 2026. 3 technologies have a page of their own.","url":"https://junglewise.ai/threats/vendors/http4s","json_url":"https://junglewise.ai/threats/vendors/http4s.json","publisher":"Junglewise Threat Intelligence","license":"CC-BY-4.0","license_url":"https://creativecommons.org/licenses/by/4.0/","attribution":"Junglewise Threat Intelligence, https://junglewise.ai/threats/vendors/http4s","sources":"NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories","kind":"vendor","counts":{"high":17,"all_time":26,"critical":2,"exploited":0,"last_7_days":1,"last_30_days":20,"last_90_days":26,"last_365_days":26},"latest":[{"cve":"CVE-2026-61741","cvss":9.3,"epss":0.0029,"slug":"cve-2026-61741-http4s-scala-xml-xxe-vulnerability-in-entitydecoder","title":"http4s-scala-xml provides `EntityDecoder[F, scala.xml.Elem]` instances that parse XML message bodies. Prior to versions 0.24.1 and 1.0.0-M39","severity":"critical","exploited":false,"published_at":"2026-09-24T18:17:16.013+00:00","url":"https://junglewise.ai/threats/cve-2026-61741-http4s-scala-xml-xxe-vulnerability-in-entitydecoder"},{"cve":"CVE-2026-88975","cvss":7.5,"epss":0.0063,"slug":"cve-2026-88975-http4s-ember-http-2-frame-buffering-denial-of-service","title":"Http4s is a Scala interface for HTTP services. Prior to 0.23.37 and 1.0.0-M48, Ember’s HTTP/2 read loop parses a frame’s 24-bit declared len","severity":"high","exploited":false,"published_at":"2026-09-15T20:19:19.943+00:00","url":"https://junglewise.ai/threats/cve-2026-88975-http4s-ember-http-2-frame-buffering-denial-of-service"},{"cve":"CVE-2026-69218","cvss":7.5,"epss":0.0063,"slug":"cve-2026-69218-http4s-ember-http-2-unbounded-continuation-frame-accumulation","title":"Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, When Ember receives an HTTP/2 HEADERS or PUSH_PROMISE frame w","severity":"high","exploited":false,"published_at":"2026-09-15T20:17:41.31+00:00","url":"https://junglewise.ai/threats/cve-2026-69218-http4s-ember-http-2-unbounded-continuation-frame-accumulation"},{"cve":"CVE-2026-69217","cvss":8.7,"epss":0.005,"slug":"cve-2026-69217-http4s-ember-http-1-1-parser-request-smuggling-via-duplicate","title":"Http4s Ember HTTP/1.1 parser request smuggling via duplicate Content-Length","severity":"high","exploited":false,"published_at":"2026-09-15T20:17:41.12+00:00","url":"https://junglewise.ai/threats/cve-2026-69217-http4s-ember-http-1-1-parser-request-smuggling-via-duplicate"},{"cve":"CVE-2026-69215","cvss":6.8,"epss":0.0051,"slug":"cve-2026-69215-http4s-cookiejar-middleware-cookie-leakage-via-substring-matching","title":"Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, The CookieJar client middleware uses unanchored substring che","severity":"medium","exploited":false,"published_at":"2026-09-15T20:17:40.95+00:00","url":"https://junglewise.ai/threats/cve-2026-69215-http4s-cookiejar-middleware-cookie-leakage-via-substring-matching"},{"cve":"CVE-2026-69210","cvss":7.5,"epss":0.0063,"slug":"cve-2026-69210-http4s-websocket-decoder-negative-length-handling-denial-of","title":"Http4s WebSocket decoder negative length handling denial of service","severity":"high","exploited":false,"published_at":"2026-09-15T20:17:40.32+00:00","url":"https://junglewise.ai/threats/cve-2026-69210-http4s-websocket-decoder-negative-length-handling-denial-of"},{"cve":"CVE-2026-69206","cvss":5.9,"epss":0.004,"slug":"cve-2026-69206-http4s-digestauth-replay-attack-in-authorization-header","title":"Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, DigestAuth replay protection records lastNc plus one instead","severity":"medium","exploited":false,"published_at":"2026-09-15T20:17:40.18+00:00","url":"https://junglewise.ai/threats/cve-2026-69206-http4s-digestauth-replay-attack-in-authorization-header"},{"cve":"CVE-2026-69205","cvss":8.7,"epss":0.0048,"slug":"cve-2026-69205-http4s-ember-http-request-smuggling-via-transfer-encoding-parsing","title":"Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s HeaderP.parse uses a case-sensitive substring test fo","severity":"high","exploited":false,"published_at":"2026-09-15T20:17:39.653+00:00","url":"https://junglewise.ai/threats/cve-2026-69205-http4s-ember-http-request-smuggling-via-transfer-encoding-parsing"},{"cve":"CVE-2026-69203","cvss":7.5,"epss":0.0063,"slug":"cve-2026-69203-http4s-ember-http-2-stream-limit-enforcement-bypass","title":"Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, An Ember server with HTTP/2 enabled through withHttp2 does no","severity":"high","exploited":false,"published_at":"2026-09-15T20:17:39.12+00:00","url":"https://junglewise.ai/threats/cve-2026-69203-http4s-ember-http-2-stream-limit-enforcement-bypass"},{"cve":"CVE-2026-69202","cvss":7.5,"epss":0.0063,"slug":"cve-2026-69202-http4s-ember-http-2-unbounded-inbound-body-buffering","title":"Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s HTTP/2 flow-control window is replenished according t","severity":"high","exploited":false,"published_at":"2026-09-15T20:17:38.55+00:00","url":"https://junglewise.ai/threats/cve-2026-69202-http4s-ember-http-2-unbounded-inbound-body-buffering"},{"cve":"CVE-2026-69216","cvss":5.4,"epss":0.0037,"slug":"cve-2026-69216-http4s-ember-chunk-parser-lenience-in-http-request-smuggling","title":"Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s chunk decoder trims the chunk-size token and accepts","severity":"medium","exploited":false,"published_at":"2026-09-15T19:17:38.603+00:00","url":"https://junglewise.ai/threats/cve-2026-69216-http4s-ember-chunk-parser-lenience-in-http-request-smuggling"},{"cve":"CVE-2026-69214","cvss":6.8,"epss":0.004,"slug":"cve-2026-69214-http4s-cookiejar-middleware-accepts-arbitrary-set-cookie-domain","title":"Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, The CookieJar client middleware stores a response cookie’s Do","severity":"medium","exploited":false,"published_at":"2026-09-15T19:17:38.453+00:00","url":"https://junglewise.ai/threats/cve-2026-69214-http4s-cookiejar-middleware-accepts-arbitrary-set-cookie-domain"},{"cve":"CVE-2026-69213","cvss":7.5,"epss":0.0063,"slug":"cve-2026-69213-http4s-ember-http-2-unbounded-outbound-frame-queue-denial-of","title":"Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember HTTP/2 serializes outbound frames through one unbounded","severity":"high","exploited":false,"published_at":"2026-09-15T19:17:38.317+00:00","url":"https://junglewise.ai/threats/cve-2026-69213-http4s-ember-http-2-unbounded-outbound-frame-queue-denial-of"},{"cve":"CVE-2026-69212","cvss":5.9,"epss":0.0028,"slug":"cve-2026-69212-http4s-followredirect-credential-leak-on-scheme-downgrade","title":"Http4s FollowRedirect credential leak on scheme downgrade","severity":"medium","exploited":false,"published_at":"2026-09-15T19:17:38.167+00:00","url":"https://junglewise.ai/threats/cve-2026-69212-http4s-followredirect-credential-leak-on-scheme-downgrade"},{"cve":"CVE-2026-69211","cvss":4.8,"epss":0.0033,"slug":"cve-2026-69211-http4s-responsecookie-header-injection-via-unescaped-attributes","title":"Http4s ResponseCookie header injection via unescaped attributes","severity":"medium","exploited":false,"published_at":"2026-09-15T19:17:38.017+00:00","url":"https://junglewise.ai/threats/cve-2026-69211-http4s-responsecookie-header-injection-via-unescaped-attributes"},{"cve":"CVE-2026-69209","cvss":7.5,"epss":0.0063,"slug":"cve-2026-69209-http4s-websocket-decoder-unbounded-message-buffering","title":"http4s WebSocket decoder unbounded message buffering","severity":"high","exploited":false,"published_at":"2026-09-15T19:17:37.87+00:00","url":"https://junglewise.ai/threats/cve-2026-69209-http4s-websocket-decoder-unbounded-message-buffering"},{"cve":"CVE-2026-69208","cvss":7.5,"epss":0.0077,"slug":"cve-2026-69208-http4s-digestauth-memory-exhaustion-via-unbounded-nonce-cache","title":"Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, the DigestAuth server middleware removes fresh nonces and sto","severity":"high","exploited":false,"published_at":"2026-09-15T19:17:37.73+00:00","url":"https://junglewise.ai/threats/cve-2026-69208-http4s-digestauth-memory-exhaustion-via-unbounded-nonce-cache"},{"cve":"CVE-2026-69204","cvss":4,"epss":0.0057,"slug":"cve-2026-69204-http4s-ember-http-request-smuggling-via-transfer-encoding-and","title":"Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember HTTP/1.1 does not reject messages containing both Trans","severity":"critical","exploited":false,"published_at":"2026-09-15T19:17:37.58+00:00","url":"https://junglewise.ai/threats/cve-2026-69204-http4s-ember-http-request-smuggling-via-transfer-encoding-and"},{"cve":"CVE-2026-69201","cvss":5.9,"epss":0.0076,"slug":"cve-2026-69201-http4s-resourceservice-and-webjarservice-path-traversal-via","title":"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 segmen","severity":"medium","exploited":false,"published_at":"2026-09-15T19:17:37.423+00:00","url":"https://junglewise.ai/threats/cve-2026-69201-http4s-resourceservice-and-webjarservice-path-traversal-via"},{"cve":"CVE-2026-73494","cvss":7.4,"epss":0.0063,"slug":"cve-2026-73494-http4s-blaze-http-1-1-parser-conformance-bypass","title":"http4s blaze HTTP/1.1 parser conformance bypass","severity":"high","exploited":false,"published_at":"2026-09-14T18:19:58.857+00:00","url":"https://junglewise.ai/threats/cve-2026-73494-http4s-blaze-http-1-1-parser-conformance-bypass"},{"cve":"CVE-2026-54556","cvss":4,"epss":0.0052,"slug":"cve-2026-54556-http4s-http-2-denial-of-service-in-hpack-header-compression","title":"Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, an unauthenticated HTTP/2 peer can cause an out-of-memory den","severity":"high","exploited":false,"published_at":"2026-08-26T15:16:49.527+00:00","url":"https://junglewise.ai/threats/cve-2026-54556-http4s-http-2-denial-of-service-in-hpack-header-compression"},{"cve":"CVE-2026-73495","cvss":7.4,"epss":0.0048,"slug":"cve-2026-73495-http4s-blaze-http-1-1-trailer-header-injection","title":"http4s blaze HTTP/1.1 trailer header injection","severity":"high","exploited":false,"published_at":"2026-08-12T22:17:16.82+00:00","url":"https://junglewise.ai/threats/cve-2026-73495-http4s-blaze-http-1-1-trailer-header-injection"},{"cve":"CVE-2026-73493","cvss":7.5,"epss":0.0063,"slug":"cve-2026-73493-http4s-blaze-server-unbounded-websocket-message-aggregation","title":"Http4s blaze-server unbounded WebSocket message aggregation","severity":"high","exploited":false,"published_at":"2026-08-12T22:17:16.673+00:00","url":"https://junglewise.ai/threats/cve-2026-73493-http4s-blaze-server-unbounded-websocket-message-aggregation"},{"cvss":7.5,"slug":"http4s-blaze-server-denial-of-service-via-unbounded-websocket-0f406951","title":"http4s blaze-server Denial of Service via Unbounded WebSocket Aggregation","severity":"high","exploited":false,"published_at":"2026-07-24T22:28:05+00:00","url":"https://junglewise.ai/threats/http4s-blaze-server-denial-of-service-via-unbounded-websocket-0f406951"},{"cvss":7.4,"slug":"http4s-blaze-server-header-sanitization-bypass-via-chunked-trailers-f39ad645","title":"http4s blaze-server header sanitization bypass via chunked trailers","severity":"high","exploited":false,"published_at":"2026-07-24T22:26:48+00:00","url":"https://junglewise.ai/threats/http4s-blaze-server-header-sanitization-bypass-via-chunked-trailers-f39ad645"}],"vendor":{"hub":true,"name":"Http4s","slug":"http4s","homepage":"https://http4s.org/","description":"Typeful, functional, asynchronous HTTP library for Scala.","url":"https://junglewise.ai/threats/vendors/http4s"},"weekly":[{"week":"2026-06-29","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-06","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-13","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-20","critical":0,"exploited":0,"vulnerabilities":3},{"week":"2026-07-27","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-03","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-10","critical":0,"exploited":0,"vulnerabilities":2},{"week":"2026-08-17","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-24","critical":0,"exploited":0,"vulnerabilities":1},{"week":"2026-08-31","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-07","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-14","critical":1,"exploited":0,"vulnerabilities":19},{"week":"2026-09-21","critical":1,"exploited":0,"vulnerabilities":1}],"most_severe":[{"cve":"CVE-2026-61741","cvss":9.3,"epss":0.0029,"slug":"cve-2026-61741-http4s-scala-xml-xxe-vulnerability-in-entitydecoder","title":"http4s-scala-xml provides `EntityDecoder[F, scala.xml.Elem]` instances that parse XML message bodies. Prior to versions 0.24.1 and 1.0.0-M39","severity":"critical","exploited":false,"published_at":"2026-09-24T18:17:16.013+00:00","url":"https://junglewise.ai/threats/cve-2026-61741-http4s-scala-xml-xxe-vulnerability-in-entitydecoder"},{"cve":"CVE-2026-69204","cvss":4,"epss":0.0057,"slug":"cve-2026-69204-http4s-ember-http-request-smuggling-via-transfer-encoding-and","title":"Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember HTTP/1.1 does not reject messages containing both Trans","severity":"critical","exploited":false,"published_at":"2026-09-15T19:17:37.58+00:00","url":"https://junglewise.ai/threats/cve-2026-69204-http4s-ember-http-request-smuggling-via-transfer-encoding-and"},{"cve":"CVE-2026-69217","cvss":8.7,"epss":0.005,"slug":"cve-2026-69217-http4s-ember-http-1-1-parser-request-smuggling-via-duplicate","title":"Http4s Ember HTTP/1.1 parser request smuggling via duplicate Content-Length","severity":"high","exploited":false,"published_at":"2026-09-15T20:17:41.12+00:00","url":"https://junglewise.ai/threats/cve-2026-69217-http4s-ember-http-1-1-parser-request-smuggling-via-duplicate"},{"cve":"CVE-2026-69205","cvss":8.7,"epss":0.0048,"slug":"cve-2026-69205-http4s-ember-http-request-smuggling-via-transfer-encoding-parsing","title":"Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s HeaderP.parse uses a case-sensitive substring test fo","severity":"high","exploited":false,"published_at":"2026-09-15T20:17:39.653+00:00","url":"https://junglewise.ai/threats/cve-2026-69205-http4s-ember-http-request-smuggling-via-transfer-encoding-parsing"},{"cve":"CVE-2026-69208","cvss":7.5,"epss":0.0077,"slug":"cve-2026-69208-http4s-digestauth-memory-exhaustion-via-unbounded-nonce-cache","title":"Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, the DigestAuth server middleware removes fresh nonces and sto","severity":"high","exploited":false,"published_at":"2026-09-15T19:17:37.73+00:00","url":"https://junglewise.ai/threats/cve-2026-69208-http4s-digestauth-memory-exhaustion-via-unbounded-nonce-cache"},{"cve":"CVE-2026-88975","cvss":7.5,"epss":0.0063,"slug":"cve-2026-88975-http4s-ember-http-2-frame-buffering-denial-of-service","title":"Http4s is a Scala interface for HTTP services. Prior to 0.23.37 and 1.0.0-M48, Ember’s HTTP/2 read loop parses a frame’s 24-bit declared len","severity":"high","exploited":false,"published_at":"2026-09-15T20:19:19.943+00:00","url":"https://junglewise.ai/threats/cve-2026-88975-http4s-ember-http-2-frame-buffering-denial-of-service"},{"cve":"CVE-2026-69218","cvss":7.5,"epss":0.0063,"slug":"cve-2026-69218-http4s-ember-http-2-unbounded-continuation-frame-accumulation","title":"Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, When Ember receives an HTTP/2 HEADERS or PUSH_PROMISE frame w","severity":"high","exploited":false,"published_at":"2026-09-15T20:17:41.31+00:00","url":"https://junglewise.ai/threats/cve-2026-69218-http4s-ember-http-2-unbounded-continuation-frame-accumulation"},{"cve":"CVE-2026-69210","cvss":7.5,"epss":0.0063,"slug":"cve-2026-69210-http4s-websocket-decoder-negative-length-handling-denial-of","title":"Http4s WebSocket decoder negative length handling denial of service","severity":"high","exploited":false,"published_at":"2026-09-15T20:17:40.32+00:00","url":"https://junglewise.ai/threats/cve-2026-69210-http4s-websocket-decoder-negative-length-handling-denial-of"},{"cve":"CVE-2026-69203","cvss":7.5,"epss":0.0063,"slug":"cve-2026-69203-http4s-ember-http-2-stream-limit-enforcement-bypass","title":"Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, An Ember server with HTTP/2 enabled through withHttp2 does no","severity":"high","exploited":false,"published_at":"2026-09-15T20:17:39.12+00:00","url":"https://junglewise.ai/threats/cve-2026-69203-http4s-ember-http-2-stream-limit-enforcement-bypass"},{"cve":"CVE-2026-69202","cvss":7.5,"epss":0.0063,"slug":"cve-2026-69202-http4s-ember-http-2-unbounded-inbound-body-buffering","title":"Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s HTTP/2 flow-control window is replenished according t","severity":"high","exploited":false,"published_at":"2026-09-15T20:17:38.55+00:00","url":"https://junglewise.ai/threats/cve-2026-69202-http4s-ember-http-2-unbounded-inbound-body-buffering"}],"generated_at":"2026-09-26T15:07:00.181821+00:00","technologies":[{"name":"Http4s-Ember-Core","slug":"http4s-ember-core","vulnerabilities":10,"url":"https://junglewise.ai/threats/technologies/http4s-ember-core"},{"name":"Http4s","slug":"http4s","vulnerabilities":6,"url":"https://junglewise.ai/threats/technologies/http4s"},{"name":"Http4s Blaze-Server","slug":"blaze-server","vulnerabilities":3,"url":"https://junglewise.ai/threats/technologies/blaze-server"}]}