{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-55831", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-17T16:29:38.864Z", "datePublished": "2026-07-20T23:00:31.859Z", "dateUpdated": "2026-07-23T14:33:27.925Z"}, "containers": {"cna": {"title": "Netty SPDY SETTINGS frame count materializes unbounded settings map", "problemTypes": [{"descriptions": [{"cweId": "CWE-770", "lang": "en", "description": "CWE-770: Allocation of Resources Without Limits or Throttling", "type": "CWE"}]}, {"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/netty/netty/security/advisories/GHSA-6jqx-86gh-f27w", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/netty/netty/security/advisories/GHSA-6jqx-86gh-f27w"}, {"name": "https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b", "tags": ["x_refsource_MISC"], "url": "https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b"}, {"name": "https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6", "tags": ["x_refsource_MISC"], "url": "https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6"}, {"name": "https://github.com/netty/netty/releases/tag/netty-4.1.136.Final", "tags": ["x_refsource_MISC"], "url": "https://github.com/netty/netty/releases/tag/netty-4.1.136.Final"}, {"name": "https://github.com/netty/netty/releases/tag/netty-4.2.16.Final", "tags": ["x_refsource_MISC"], "url": "https://github.com/netty/netty/releases/tag/netty-4.2.16.Final"}], "affected": [{"vendor": "netty", "product": "netty", "versions": [{"version": ">= 4.2.0.Final, < 4.2.16.Final", "status": "affected"}, {"version": ">= 4.1.0.Final, < 4.1.136.Final", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-07-20T23:00:31.859Z"}, "descriptions": [{"lang": "en", "value": "Netty is a network application framework for development of protocol servers and clients. Prior to 4.1.136.Final and 4.2.16.Final, Netty's SPDY SETTINGS decoder accepts a peer-declared SETTINGS entry count up to the 24-bit frame-length limit and materializes every unique setting ID in `DefaultSpdySettingsFrame`, allowing a remote SPDY/3.1 peer to send a syntactically valid roughly 2 MiB SETTINGS frame that creates 262144 map entries and amplifies network input into heap growth and ordered-map insertion work. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final."}], "source": {"advisory": "GHSA-6jqx-86gh-f27w", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/netty/netty/security/advisories/GHSA-6jqx-86gh-f27w", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-07-23T14:33:23.657664Z", "id": "CVE-2026-55831", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-23T14:33:27.925Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-55831", "role": "CISA Coordinator", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-23T14:33:23.657664Z"}}}], "references": [{"url": "https://github.com/netty/netty/security/advisories/GHSA-6jqx-86gh-f27w", "tags": ["exploit"]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-23T14:33:14.087Z"}}], "cna": {"title": "Netty SPDY SETTINGS frame count materializes unbounded settings map", "source": {"advisory": "GHSA-6jqx-86gh-f27w", "discovery": "UNKNOWN"}, "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}], "affected": [{"vendor": "netty", "product": "netty", "versions": [{"status": "affected", "version": ">= 4.2.0.Final, < 4.2.16.Final"}, {"status": "affected", "version": ">= 4.1.0.Final, < 4.1.136.Final"}]}], "references": [{"url": "https://github.com/netty/netty/security/advisories/GHSA-6jqx-86gh-f27w", "name": "https://github.com/netty/netty/security/advisories/GHSA-6jqx-86gh-f27w", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b", "name": "https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6", "name": "https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/netty/netty/releases/tag/netty-4.1.136.Final", "name": "https://github.com/netty/netty/releases/tag/netty-4.1.136.Final", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/netty/netty/releases/tag/netty-4.2.16.Final", "name": "https://github.com/netty/netty/releases/tag/netty-4.2.16.Final", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en", "value": "Netty is a network application framework for development of protocol servers and clients. Prior to 4.1.136.Final and 4.2.16.Final, Netty's SPDY SETTINGS decoder accepts a peer-declared SETTINGS entry count up to the 24-bit frame-length limit and materializes every unique setting ID in `DefaultSpdySettingsFrame`, allowing a remote SPDY/3.1 peer to send a syntactically valid roughly 2 MiB SETTINGS frame that creates 262144 map entries and amplifies network input into heap growth and ordered-map insertion work. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-770", "description": "CWE-770: Allocation of Resources Without Limits or Throttling"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-400", "description": "CWE-400: Uncontrolled Resource Consumption"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-07-20T23:00:31.859Z"}}}, "cveMetadata": {"cveId": "CVE-2026-55831", "state": "PUBLISHED", "dateUpdated": "2026-07-23T14:33:27.925Z", "dateReserved": "2026-06-17T16:29:38.864Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-07-20T23:00:31.859Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[4.2.0.Final,4.2.16.Final)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[4.1.0.Final,4.1.136.Final)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "netty", "source": "cna", "vendor": "netty"}, "product": "netty", "vendor": "netty"}], "created": "2026-07-22T00:30:04.299801+00:00", "updated": "2026-07-24T04:45:03.422594+00:00", "vendors": ["netty", "netty$PRODUCT$netty"]}