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        "cveId": "CVE-2026-54428",
        "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
        "state": "PUBLISHED",
        "assignerShortName": "apache",
        "dateReserved": "2026-06-14T09:39:30.814Z",
        "datePublished": "2026-07-01T17:03:53.938Z",
        "dateUpdated": "2026-07-01T18:15:56.634Z"
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    "containers": {
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                    "collectionURL": "https://repo.maven.apache.org/maven2/",
                    "defaultStatus": "unaffected",
                    "packageName": "org.apache.httpcomponents.core5:httpcore5-h2",
                    "product": "Apache HttpComponents Core",
                    "vendor": "Apache Software Foundation",
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                            "lessThanOrEqual": "5.5-beta1",
                            "status": "affected",
                            "version": "5.5-alpha",
                            "versionType": "maven"
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                            "status": "affected",
                            "version": "5.0-alpha",
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            "credits": [
                {
                    "lang": "en",
                    "type": "finder",
                    "value": "Henry Huang <zhuang3@paypal.com>"
                }
            ],
            "descriptions": [
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                    "lang": "en",
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                            "type": "text/html",
                            "value": "Allocation of resources without limits or throttling in the HTTP/2 HPACK decoder in Apache HttpComponents Core (5.4.2 and earlier, 5.5-beta1 and earlier) allows an remote attacker to cause a denial of service through memory exhaustion by sending oversized compressed header blocks before the HTTP/2 SETTINGS acknowledgement causes the configured header list size limit to be applied.<br><br>"
                        }
                    ],
                    "value": "Allocation of resources without limits or throttling in the HTTP/2 HPACK decoder in Apache HttpComponents Core (5.4.2 and earlier, 5.5-beta1 and earlier) allows an remote attacker to cause a denial of service through memory exhaustion by sending oversized compressed header blocks before the HTTP/2 SETTINGS acknowledgement causes the configured header list size limit to be applied."
                }
            ],
            "metrics": [
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                            "text": "Important"
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                    "descriptions": [
                        {
                            "cweId": "CWE-770",
                            "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
                            "lang": "en",
                            "type": "CWE"
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                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-400",
                            "description": "CWE-400: Uncontrolled Resource Consumption",
                            "lang": "en",
                            "type": "CWE"
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                    ]
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            "providerMetadata": {
                "orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
                "shortName": "apache",
                "dateUpdated": "2026-07-01T17:05:35.023Z"
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            "references": [
                {
                    "tags": [
                        "vendor-advisory"
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                    "url": "https://lists.apache.org/thread/5zjp8vczvxq19pw2rvhs21q446bhl0sd"
                }
            ],
            "source": {
                "discovery": "UNKNOWN"
            },
            "title": "Apache HttpComponents Core: HPackDecoder Unlimited Header List Size Before SETTINGS ACK",
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                "engine": "Vulnogram 0.2.0"
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        },
        "adp": [
            {
                "title": "CVE Program Container",
                "references": [
                    {
                        "url": "http://www.openwall.com/lists/oss-security/2026/07/01/3"
                    }
                ],
                "providerMetadata": {
                    "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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                    "dateUpdated": "2026-07-01T17:36:48.420Z"
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            {
                "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"
                        }
                    },
                    {
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                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-07-01T18:15:24.114171Z",
                                "id": "CVE-2026-54428",
                                "options": [
                                    {
                                        "Exploitation": "none"
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                                "role": "CISA Coordinator",
                                "version": "2.0.3"
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                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
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                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-07-01T18:15:56.634Z"
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