{"action":"Upgrade org.http4s:http4s-ember-core_2.12 to 0.23.35 or later.","affected":[{"fixed":"0.23.35","introduced":"0"}],"component":"org.http4s:http4s-ember-core_2.12","cve_ids":["CVE-2026-54556"],"ecosystem":"Maven","epss":0.00524,"exploited":false,"fixed_versions":["0.23.35"],"ghsa_id":"GHSA-vmm3-xgcx-67hm","id":"tcs_01M5N9EBG1RGT1E9MDTZM1T1BJ","modified_at":"2026-08-26T14:26:28.260052Z","published_at":"2026-08-26T14:10:59Z","references":["https://osv.dev/vulnerability/GHSA-vmm3-xgcx-67hm","https://github.com/http4s/http4s/security/advisories/GHSA-vmm3-xgcx-67hm","https://github.com/http4s/http4s/commit/6e8eccd64a6a74ab4811897881e95e0e1b3a818e","https://github.com/http4s/http4s","https://github.com/http4s/http4s/releases/tag/v0.23.35","https://github.com/http4s/http4s/releases/tag/v1.0.0-M47"],"severity":{"label":"high","score":8.2},"sources":[{"source":"osv","source_id":"GHSA-vmm3-xgcx-67hm","url":"https://osv.dev/vulnerability/GHSA-vmm3-xgcx-67hm"},{"source":"nvd","source_id":"CVE-2026-54556","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54556"}],"summary":"http4s has HTTP/2 Denial of Service with Ember Backend"}