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    "cveMetadata": {
        "cveId": "CVE-2026-77762",
        "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
        "state": "PUBLISHED",
        "assignerShortName": "apache",
        "dateReserved": "2026-08-21T10:14:30.089Z",
        "datePublished": "2026-09-23T11:19:28.370Z",
        "dateUpdated": "2026-09-23T18:10:43.790Z"
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            },
            "title": "Apache Tomcat: Stale HPACK emitter injects trailers into recycled pooled Request",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')",
                            "lang": "en",
                            "cweId": "CWE-362",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "source": {
                "discovery": "INTERNAL"
            },
            "affected": [
                {
                    "vendor": "Apache Software Foundation",
                    "product": "Apache Tomcat",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "11.0.0-M1",
                            "lessThanOrEqual": "11.0.25",
                            "versionType": "semver"
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                        {
                            "status": "affected",
                            "version": "10.1.0-M1",
                            "lessThanOrEqual": "10.1.59",
                            "versionType": "semver"
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                        {
                            "status": "affected",
                            "version": "9.0.39",
                            "lessThanOrEqual": "9.0.121",
                            "versionType": "semver"
                        },
                        {
                            "status": "affected",
                            "version": "8.56.59",
                            "lessThanOrEqual": "8.5.100",
                            "versionType": "semver"
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                        {
                            "status": "unaffected",
                            "version": "0",
                            "lessThanOrEqual": "7.0.109",
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                }
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            "descriptions": [
                {
                    "value": "Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') vulnerability in Apache Tomcat allows an attacker to inject trailer fields into another HTTP/2 request.\n\n\n\nThis issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.39 through 9.0.121.\n\n\n\nThe following versions were EOL at the time the CVE was created but are \nknown to be affected: from 8.5.59 through 8.5.100. Other unsupported versions may also be affected.\n\n\n\n\nUsers are recommended to upgrade to version 11.0.26, 10.1.60, 9.0.122, which fix the issue.",
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                            "value": "<p>Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') vulnerability in Apache Tomcat allows an attacker to inject trailer fields into another HTTP/2 request.</p><p>This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.39 through 9.0.121.</p><p>The following versions were EOL at the time the CVE was created but are \nknown to be affected: from 8.5.59 through 8.5.100. Other unsupported versions may also be affected.<br></p><p>Users are recommended to upgrade to version 11.0.26, 10.1.60, 9.0.122, which fix&nbsp;the issue.</p>"
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://lists.apache.org/thread/y5r9fvjo7ol24mkoyoc0st8bqrfyqcyn",
                    "tags": [
                        "vendor-advisory"
                    ]
                }
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            "metrics": [
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                    "other": {
                        "type": "Textual description of severity",
                        "content": {
                            "text": "low"
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                            "lang": "en",
                            "value": "GENERAL"
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                        "cvssV3_1": {
                            "scope": "UNCHANGED",
                            "version": "3.1",
                            "baseScore": 8.1,
                            "attackVector": "NETWORK",
                            "baseSeverity": "HIGH",
                            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
                            "integrityImpact": "HIGH",
                            "userInteraction": "NONE",
                            "attackComplexity": "HIGH",
                            "availabilityImpact": "HIGH",
                            "privilegesRequired": "NONE",
                            "confidentialityImpact": "HIGH"
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                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-09-23T15:40:01.556894Z",
                                "id": "CVE-2026-77762",
                                "options": [
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                                        "Exploitation": "none"
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                                "role": "CISA Coordinator",
                                "version": "2.0.3"
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                "title": "CISA ADP Vulnrichment",
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