{"id":"CVE-2026-69202","title":"Http4s is a Scala interface for HTTP services","summary":"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 strea…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-400","CWE-770"],"vendor":"http4s","product":"org.http4s:http4s-ember-core_2.12","affected":["org.http4s:http4s-ember-core_2.12 <= 0.23.34","org.http4s:http4s-ember-core_2.13 <= 0.23.34","org.http4s:http4s-ember-core_3 <= 0.23.34","org.http4s:http4s-ember-core_2.13 >= 1.0.0-M1, <= 1.0.0-M46","org.http4s:http4s-ember-core_3 >= 1.0.0-M1, <= 1.0.0-M46"],"patched":["org.http4s:http4s-ember-core_2.12 0.23.35","org.http4s:http4s-ember-core_2.13 0.23.35","org.http4s:http4s-ember-core_3 0.23.35","org.http4s:http4s-ember-core_2.13 1.0.0-M47","org.http4s:http4s-ember-core_3 1.0.0-M47"],"published":"2026-09-15","updated":"2026-09-16","sourceUpdated":"2026-09-16T20:38:04.943","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-69202","references":[{"url":"https://github.com/http4s/http4s/commit/22d2335975d02dc9fb9fb75cfe002279521d86ac","label":"security-advisories@github.com"},{"url":"https://github.com/http4s/http4s/releases/tag/v0.23.35","label":"security-advisories@github.com"},{"url":"https://github.com/http4s/http4s/releases/tag/v1.0.0-M47","label":"security-advisories@github.com"},{"url":"https://github.com/http4s/http4s/security/advisories/GHSA-6m4x-pp6q-5jmm","label":"security-advisories@github.com"},{"url":"https://github.com/advisories/GHSA-6m4x-pp6q-5jmm"}],"tags":["nvd","ghsa","maven","cve.org"],"aliases":["GHSA-6m4x-pp6q-5jmm"],"ecosystem":"maven","ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-15T19:39:06.340199Z"},"ingestedAt":"2026-09-15T19:42:58.814Z","epss":0.00441,"epssPercentile":0.37596,"slug":"CVE-2026-69202","body":"## Overview\n\nHttp4s 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 therefore send a body faster than a slow or non-draining application consumes it, retaining payloads in heap on an ember-server or ember-client configured with withHttp2. The patch bounds the per-stream H2Connection body channel so application consumption applies backpressure. This issue is fixed in versions 0.23.35 and 1.0.0-M47.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-69202)\n\nAffected packages:\n\n- `org.http4s:http4s-ember-core_2.12 <= 0.23.34`\n- `org.http4s:http4s-ember-core_2.13 <= 0.23.34`\n- `org.http4s:http4s-ember-core_3 <= 0.23.34`\n- `org.http4s:http4s-ember-core_2.13 >= 1.0.0-M1, <= 1.0.0-M46`\n- `org.http4s:http4s-ember-core_3 >= 1.0.0-M1, <= 1.0.0-M46`\n\nPatched in:\n\n- `org.http4s:http4s-ember-core_2.12 0.23.35`\n- `org.http4s:http4s-ember-core_2.13 0.23.35`\n- `org.http4s:http4s-ember-core_3 0.23.35`\n- `org.http4s:http4s-ember-core_2.13 1.0.0-M47`\n- `org.http4s:http4s-ember-core_3 1.0.0-M47`\n\nSource: https://github.com/advisories/GHSA-6m4x-pp6q-5jmm","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}