CVE-2026-69215

Http4s is a Scala library for HTTP services. Prior to 0.23.35 and 1.0.0-M47 , its CookieJar client middleware uses unanchored substring checks instead of proper RFC 6265 domain and path matching when deciding whether to attach a stored cookie. As a result, a cookie intended for example.com can be...

CVE-2026-69215 Http4s: CookieJar middleware matches by substring, leaking cookies cross-origin

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 checks instead of RFC 6265 domain and path matching when deciding whether to attach a stored cookie. A cookie for example.com can consequently be sent to an...

CVE-2026-69215 Http4s: CookieJar middleware matches by substring, leaking cookies cross-origin

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 checks instead of RFC 6265 domain and path matching when deciding whether to attach a stored cookie. A cookie for example.com can consequently be sent to an...

CVE-2026-69205 Http4s: Ember Transfer-Encoding value parsing (TE.CL / TE.0 request smuggling)

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 for the Transfer-Encoding value and decodes header bytes with the platform default charset. Values such as Chunked are not recognized, values such as notchunke...

CVE-2026-69205 Http4s: Ember Transfer-Encoding value parsing (TE.CL / TE.0 request smuggling)

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 for the Transfer-Encoding value and decodes header bytes with the platform default charset. Values such as Chunked are not recognized, values such as notchunke...

CVE-2026-69205 Http4s: Ember Transfer-Encoding value parsing (TE.CL / TE.0 request smuggling)

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 for the Transfer-Encoding value and decodes header bytes with the platform default charset. Values such as Chunked are not recognized, values such as notchunke...

EUVD-2026-79190

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 for the Transfer-Encoding value and decodes header bytes with the platform default charset. Values such as Chunked are not recognized, values such as notchunke...

CVE-2026-69205

Http4s (a Scala HTTP library) is affected in its Ember backend, specifically the HeaderP.parse function, which uses a case-sensitive substring test for the Transfer-Encoding value and decodes header bytes with the platform default charset. This causes mismatches with RFC-compliant intermediaries,...

CVE-2026-69212 Http4s: FollowRedirect middleware leaks credentials over https->http same-authority redirect

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, The FollowRedirect client middleware strips Authorization and Cookie headers only when a redirect changes authority, but authority comparison excludes the URI scheme. A same-authority redirect from HTTPS to HTTP...

CVE-2026-69212

Http4s (a Scala HTTP client/server library) is affected in its FollowRedirect client middleware. The root cause is that the middleware's authority comparison excludes the URI scheme when deciding whether to strip Authorization and Cookie headers on redirect. As a result, a same-authority redirect...

EUVD-2026-79186

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, The FollowRedirect client middleware strips Authorization and Cookie headers only when a redirect changes authority, but authority comparison excludes the URI scheme. A same-authority redirect from HTTPS to HTTP...

CVE-2026-69212 Http4s: FollowRedirect middleware leaks credentials over https->http same-authority redirect

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, The FollowRedirect client middleware strips Authorization and Cookie headers only when a redirect changes authority, but authority comparison excludes the URI scheme. A same-authority redirect from HTTPS to HTTP...

CVE-2026-69212 Http4s: FollowRedirect middleware leaks credentials over https->http same-authority redirect

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, The FollowRedirect client middleware strips Authorization and Cookie headers only when a redirect changes authority, but authority comparison excludes the URI scheme. A same-authority redirect from HTTPS to HTTP...

CVE-2026-69213 Http4s Ember HTTP/2: unbounded outbound frame queue

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 queue consumed by writeLoop. When the peer stops reading, an unauthenticated HTTP/2 client can continue sending PING, SETTINGS, or DATA frames that cause...

CVE-2026-69213

Http4s is a Scala interface for HTTP services. The vulnerability lies in Ember HTTP/2 , which serializes outbound frames through a single unbounded queue consumed by writeLoop. When a peer stops reading, an unauthenticated HTTP/2 client can keep sending PING, SETTINGS, or DATA frames , causing Em...

EUVD-2026-79183

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 queue consumed by writeLoop. When the peer stops reading, an unauthenticated HTTP/2 client can continue sending PING, SETTINGS, or DATA frames that cause...

CVE-2026-69213 Http4s Ember HTTP/2: unbounded outbound frame queue

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 queue consumed by writeLoop. When the peer stops reading, an unauthenticated HTTP/2 client can continue sending PING, SETTINGS, or DATA frames that cause...

CVE-2026-69213 Http4s Ember HTTP/2: unbounded outbound frame queue

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 queue consumed by writeLoop. When the peer stops reading, an unauthenticated HTTP/2 client can continue sending PING, SETTINGS, or DATA frames that cause...

CVE-2026-69214

Http4s , a Scala library for HTTP services, is affected through its CookieJar client middleware . Prior to 0.23.35 and 1.0.0-M47 , the middleware stores a response cookie's Domain attribute without validating that it domain-matches the supplying host or rejecting public suffixes. A malicious or c...

CVE-2026-69214 Http4s: CookieJar middleware accepts arbitrary Set-Cookie domain

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 Domain attribute without checking that it domain-matches the host that supplied the cookie or rejecting public suffixes. A malicious or compromised server...