Http4s Ember HTTP/2: unbounded inbound body buffering

Ember's HTTP/2 stack replenishes the inbound flow-control window based on bytes received off the wire, not bytes consumed by the application. Received DATA is buffered in an unbounded per-stream channel. Flow control therefore provides no backpressure: a peer can stream a large or unbounded body...

GHSA-6M4X-PP6Q-5JMM Http4s Ember HTTP/2: unbounded inbound body buffering

Ember's HTTP/2 stack replenishes the inbound flow-control window based on bytes received off the wire, not bytes consumed by the application. Received DATA is buffered in an unbounded per-stream channel. Flow control therefore provides no backpressure: a peer can stream a large or unbounded body...

CVE-2026-88975

Http4s (a Scala HTTP library) is vulnerable in Ember's HTTP/2 read loop prior to versions 0.23.37 and 1.0.0-M48 . The loop parses a frame's 24-bit declared length but buffers the entire payload before comparing it against SETTINGS_MAX_FRAME_SIZE . An unauthenticated peer can declare a payload nea...

CVE-2026-88975 Http4s: Ember HTTP/2 buffers a frame's declared payload before checking SETTINGS_MAX_FRAME_SIZE

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 length but waits to buffer the entire payload before comparing it with SETTINGSMAXFRAMESIZE. An unauthenticated peer can declare a payload near 16 MiB on a...

EUVD-2026-79239

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 length but waits to buffer the entire payload before comparing it with SETTINGSMAXFRAMESIZE. An unauthenticated peer can declare a payload near 16 MiB on a...

CVE-2026-88975 Http4s: Ember HTTP/2 buffers a frame's declared payload before checking SETTINGS_MAX_FRAME_SIZE

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 length but waits to buffer the entire payload before comparing it with SETTINGSMAXFRAMESIZE. An unauthenticated peer can declare a payload near 16 MiB on a...

CVE-2026-88975 Http4s: Ember HTTP/2 buffers a frame's declared payload before checking SETTINGS_MAX_FRAME_SIZE

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 length but waits to buffer the entire payload before comparing it with SETTINGSMAXFRAMESIZE. An unauthenticated peer can declare a payload near 16 MiB on a...

ai.starlake:quack-on-demand_3 (>=0.1.0, <=0.4.0), com.47deg:energy-monitor-persistence-app_3 (0.2.0) +194 more potentially affected by CVE-2026-69206 via org.http4s:http4s-ember-core_3 (>=0.22.0-m8, <=0.23.34)

org.http4s:http4s-ember-core3 MAVEN version =0.22.0-m8, =0.1.0, =0.0-a75a626, =0.17.0, =0.17.0, =0.17.0, =0.17.0, =0.17.0, =0.17.0, =0.0.1, =1.0.0, =0.0.0-3-cca5341b, =7.1.0, =7.1.1 and more Source cves: CVE-2026-69206 Source advisory: MEND:CVE-2026-69206...

dev.i10416:slackapis-core_3 (>=0.0.1, <=0.0.2), es.weso:schema_3 (>=0.1.103, <=0.2.4) +22 more potentially affected by CVE-2026-69206 via org.http4s:http4s-ember-core_3 (>=1.0.0-m22, <=1.0.0-m46)

org.http4s:http4s-ember-core3 MAVEN version =1.0.0-m22, =0.0.1, =0.1.103, =0.1.103, =0.1.103, =0.1.93, =0.1.109, =0.1.93, =0.1.102, =0.1.1, =0.0.13, =0.1.93, =0.19.0, =0.1.0, =0.1.7 and more Source cves: CVE-2026-69206 Source advisory: MEND:CVE-2026-69206...

com.armanbilge:feral-lambda-cloudformation-custom-resource_2.12 (>=0.1-f497734, <=0.1-7d4b1e7), com.armanbilge:sbt-bundlemon_2.12_1.0 (0.1.4) +69 more potentially affected by CVE-2026-69206 via org.http4s:http4s-ember-core_2.12 (>=0.10.0-m10, <=0.23.34)

org.http4s:http4s-ember-core2.12 MAVEN version =0.10.0-m10, =0.1-f497734, =0.17.0, =0.17.0, =0.17.0, =0.17.0, =0.17.0, =0.17.0, =0.0.0-3-cca5341b, =0.0.0-3-cca5341b, =7.1.0, =0.21.0, =0.20.4, =0.21.0, =0.21.0, =0.22.1 and more Source cves: CVE-2026-69206 Source advisory: MEND:CVE-2026-69206...

dev.i10416:slackapis-core_2.13 (>=0.0.1, <=0.0.2), es.weso:rdfshape-server_2.13 (>=0.0.73, <=0.2.14) +16 more potentially affected by CVE-2026-69206 via org.http4s:http4s-ember-core_2.13 (>=1.0.0-m2, <=1.0.0-m46)

org.http4s:http4s-ember-core2.13 MAVEN version =1.0.0-m2, =0.0.1, =0.0.73, =0.1.90, =0.1.90, =0.1.90, =0.1.91, =0.1.109, =0.1.91, =0.1.101, =0.0.82, =0.1.91, =0.1.0, =2.1.0, =2.1.0, =2.2.2 and more Source cves: CVE-2026-69206 Source advisory: MEND:CVE-2026-69206...

co.topl:bifrost-daml-broker_2.13 (1.0.0.beta-2), co.topl:brambl-cli_2.13 (>=2.0.0-beta1, <=2.0.0-beta6) +126 more potentially affected by CVE-2026-69206 via org.http4s:http4s-ember-core_2.13 (>=0.10.0-m10, <=0.23.34)

org.http4s:http4s-ember-core2.13 MAVEN version =0.10.0-m10, =2.0.0-beta1, =0.0-a75a626, =0.17.0, =0.17.0, =0.17.0, =0.17.0, =0.17.0, =0.17.0, =0.0.0-3-cca5341b, =0.0.0-3-cca5341b, =7.1.0, =0.1.0, =0.21.0, =0.24.0 and more Source cves: CVE-2026-69206 Source advisory: MEND:CVE-2026-69206...

CVE-2026-69202

Http4s is a Scala HTTP services library. In versions prior to 0.23.35 and 1.0.0-M47 , Ember's HTTP/2 flow-control window is replenished based on bytes received from the network rather than bytes consumed by the application, and each stream stores DATA in an unbounded channel . A remote peer can t...

CVE-2026-69202 Http4s Ember HTTP/2: unbounded inbound body buffering

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 to bytes received from the network rather than bytes consumed by the application, while each stream stores DATA in an unbounded channel. A hostile peer can...

CVE-2026-69202 Http4s Ember HTTP/2: unbounded inbound body buffering

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 to bytes received from the network rather than bytes consumed by the application, while each stream stores DATA in an unbounded channel. A hostile peer can...

EUVD-2026-79234

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 to bytes received from the network rather than bytes consumed by the application, while each stream stores DATA in an unbounded channel. A hostile peer can...

CVE-2026-69218 Http4s Ember HTTP/2: unbounded continuation frame accumulation

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 PUSHPROMISE frame without ENDHEADERS, H2Connection buffers the header block and subsequent CONTINUATION fragments without a size bound. A remote peer can keep an incomplete bloc...

CVE-2026-69218 Http4s Ember HTTP/2: unbounded continuation frame accumulation

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 PUSHPROMISE frame without ENDHEADERS, H2Connection buffers the header block and subsequent CONTINUATION fragments without a size bound. A remote peer can keep an incomplete bloc...

CVE-2026-69218

Http4s Ember HTTP/2 is vulnerable to unbounded continuation frame accumulation in its H2Connection component. When Ember receives an HTTP/2 HEADERS or PUSH_PROMISE frame without END_HEADERS, it buffers the header block and subsequent CONTINUATION fragments without a size bound . A remote peer can...

EUVD-2026-79195

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 PUSHPROMISE frame without ENDHEADERS, H2Connection buffers the header block and subsequent CONTINUATION fragments without a size bound. A remote peer can keep an incomplete bloc...