cve-2026-77762

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              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
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                "id": "CVE-2026-77762",
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                "timestamp": "2026-09-23T15:40:01.556894Z",
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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        "title": "CISA ADP Vulnrichment"
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      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Apache Tomcat",
          "vendor": "Apache Software Foundation",
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              "version": "11.0.0-M1",
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            {
              "lessThanOrEqual": "9.0.121",
              "status": "affected",
              "version": "9.0.39",
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              "status": "affected",
              "version": "8.56.59",
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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>"
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          "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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              "cweId": "CWE-362",
              "description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')",
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        "dateUpdated": "2026-09-23T11:19:28.370Z",
        "orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
        "shortName": "apache"
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          "tags": [
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          "url": "https://lists.apache.org/thread/y5r9fvjo7ol24mkoyoc0st8bqrfyqcyn"
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      "source": {
        "discovery": "INTERNAL"
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      "title": "Apache Tomcat: Stale HPACK emitter injects trailers into recycled pooled Request",
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    "assignerShortName": "apache",
    "cveId": "CVE-2026-77762",
    "datePublished": "2026-09-23T11:19:28.370Z",
    "dateReserved": "2026-08-21T10:14:30.089Z",
    "dateUpdated": "2026-09-23T15:40:13.579Z",
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