{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-88975", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-09-10T16:02:31.341Z", "datePublished": "2026-09-15T19:31:25.221Z", "dateUpdated": "2026-09-15T19:31:25.221Z"}, "containers": {"cna": {"title": "Http4s: Ember HTTP/2 buffers a frame's declared payload before checking SETTINGS_MAX_FRAME_SIZE", "problemTypes": [{"descriptions": [{"cweId": "CWE-400", "lang": "en", "description": "CWE-400: Uncontrolled Resource Consumption", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/http4s/http4s/security/advisories/GHSA-gq9p-f254-h286", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/http4s/http4s/security/advisories/GHSA-gq9p-f254-h286"}, {"name": "https://github.com/http4s/http4s/commit/87cf334fa3f608ef7d3eb359e71e037ba3336d29", "tags": ["x_refsource_MISC"], "url": "https://github.com/http4s/http4s/commit/87cf334fa3f608ef7d3eb359e71e037ba3336d29"}, {"name": "https://github.com/http4s/http4s/releases/tag/v0.23.37", "tags": ["x_refsource_MISC"], "url": "https://github.com/http4s/http4s/releases/tag/v0.23.37"}, {"name": "https://github.com/http4s/http4s/releases/tag/v1.0.0-M48", "tags": ["x_refsource_MISC"], "url": "https://github.com/http4s/http4s/releases/tag/v1.0.0-M48"}], "affected": [{"vendor": "http4s", "product": "http4s", "versions": [{"version": "< 0.23.37", "status": "affected"}, {"version": ">= 1.0.0-M1, < 1.0.0-M48", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-15T19:31:25.221Z"}, "descriptions": [{"lang": "en", "value": "Http4s is a Scala interface for HTTP services. Prior to 0.23.37 and 1.0.0-M48, Ember\u2019s HTTP/2 read loop parses a frame\u2019s 24-bit declared length but waits to buffer the entire payload before comparing it with SETTINGS_MAX_FRAME_SIZE. An unauthenticated peer can declare a payload near 16 MiB on a connection where Ember advertised 16 KiB and either complete or slowly stream it, causing up to 1024-fold memory amplification per connection before processFrame can reject the frame. The shared H2Connection.readLoop affects withHttp2 servers and clients, while HTTP/2-disabled configurations are unaffected, and the patch rejects oversized frames before buffering their payloads. This issue is fixed in versions 0.23.37 and 1.0.0-M48."}], "source": {"advisory": "GHSA-gq9p-f254-h286", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "http4s", "vendor": "http4s", "versions": [{"status": "affected", "version": "< 0.23.37"}, {"status": "affected", "version": ">= 1.0.0-M1, < 1.0.0-M48"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Http4s is a Scala interface for HTTP services. Prior to 0.23.37 and 1.0.0-M48, Ember\u2019s HTTP/2 read loop parses a frame\u2019s 24-bit declared length but waits to buffer the entire payload before comparing it with SETTINGS_MAX_FRAME_SIZE. An unauthenticated peer can declare a payload near 16 MiB on a connection where Ember advertised 16 KiB and either complete or slowly stream it, causing up to 1024-fold memory amplification per connection before processFrame can reject the frame. The shared H2Connection.readLoop affects withHttp2 servers and clients, while HTTP/2-disabled configurations are unaffected, and the patch rejects oversized frames before buffering their payloads. This issue is fixed in versions 0.23.37 and 1.0.0-M48."}], "id": "CVE-2026-88975", "lastModified": "2026-09-15T20:19:19.943", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-09-15T20:19:19.943", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/http4s/http4s/commit/87cf334fa3f608ef7d3eb359e71e037ba3336d29"}, {"source": "security-advisories@github.com", "url": "https://github.com/http4s/http4s/releases/tag/v0.23.37"}, {"source": "security-advisories@github.com", "url": "https://github.com/http4s/http4s/releases/tag/v1.0.0-M48"}, {"source": "security-advisories@github.com", "url": "https://github.com/http4s/http4s/security/advisories/GHSA-gq9p-f254-h286"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{}