GHSA-R29C-68GH-XP6X

Vulnerability from github – Published: 2026-05-12 18:30 – Updated: 2026-05-18 20:28
VLAI
Summary
Apache Tomcat - HTTP/2 request headers not validated
Details

Versions Affected: Apache Tomcat 11.0.0-M1 to 11.0.21 Apache Tomcat 10.1.0-M1 to 10.1.54 Apache Tomcat 9.0.0.M1 to 9.0.117 Older, unsupported versions may also be affected

Description: HTTP/2 request headers were not validated which may have triggered unexpected application behaviour if the application (quite reasonably) assumed that header value exposed through the Servlet API would be specification compliant.

Mitigation: Users of the affected versions should apply one of the following mitigations: - Upgrade to Apache Tomcat 11.0.22 or later - Upgrade to Apache Tomcat 10.1.55 or later - Upgrade to Apache Tomcat 9.0.118 or later

Credit: This issue was identified by Dawit Jeong (@dawitngoliath)

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.tomcat.embed:tomcat-embed-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9.0.118"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.tomcat.embed:tomcat-embed-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "10.1.0-M1"
            },
            {
              "fixed": "10.1.55"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.tomcat.embed:tomcat-embed-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "11.0.0-M1"
            },
            {
              "fixed": "11.0.22"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.tomcat:tomcat"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9.0.118"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.tomcat:tomcat"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "10.1.0-M1"
            },
            {
              "fixed": "10.1.55"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.tomcat:tomcat"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "11.0.0-M1"
            },
            {
              "fixed": "11.0.22"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.tomcat:tomcat-catalina"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9.0.118"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.tomcat:tomcat-catalina"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "10.1.0-M1"
            },
            {
              "fixed": "10.1.55"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.tomcat:tomcat-catalina"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "11.0.0-M1"
            },
            {
              "fixed": "11.0.22"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-41293"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-20"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-18T20:28:53Z",
    "nvd_published_at": "2026-05-12T16:16:17Z",
    "severity": "CRITICAL"
  },
  "details": "Versions Affected:\nApache Tomcat 11.0.0-M1 to 11.0.21\nApache Tomcat 10.1.0-M1 to 10.1.54\nApache Tomcat 9.0.0.M1 to 9.0.117\nOlder, unsupported versions may also be affected\n\nDescription:\nHTTP/2 request headers were not validated which may have triggered\nunexpected application behaviour if the application (quite reasonably)\nassumed that header value exposed through the Servlet API would be\nspecification compliant.\n\nMitigation:\nUsers of the affected versions should apply one of the following\nmitigations:\n- Upgrade to Apache Tomcat 11.0.22 or later\n- Upgrade to Apache Tomcat 10.1.55 or later\n- Upgrade to Apache Tomcat 9.0.118 or later\n\nCredit:\nThis issue was identified by Dawit Jeong (@dawitngoliath)",
  "id": "GHSA-r29c-68gh-xp6x",
  "modified": "2026-05-18T20:28:53Z",
  "published": "2026-05-12T18:30:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-41293"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/tomcat/commit/19f17a257797e8d139b33ff9c88d362a273be148"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/tomcat/commit/1c70480466572c9192ed412ebefcd43fc63137fd"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/tomcat/commit/2a2476460e823789f530a22207873ea8cd6eff3b"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/tomcat/commit/3915fd27e6810b14ccd21e3d900bd8faef44d3df"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/tomcat/commit/57c2b3bfd62792631e1df24cf4237b990a0b36fa"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/tomcat/commit/c2925554c677da57390f940d856871e18daaacab"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/tomcat/commit/cf9452443bcbf3b1a4b435ef7d624364f1b65ca3"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/tomcat/commit/e5cef9618c3f4fd31bd6fb1e83f0f18022280dac"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/tomcat/commit/f72a6174ab1f0f5a053435f80448b4f6837fe6d7"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/apache/tomcat"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread/qwg0q16z7xkb2qrr853wdll5531mvl1r"
    },
    {
      "type": "WEB",
      "url": "https://tomcat.apache.org/security-10.html"
    },
    {
      "type": "WEB",
      "url": "https://tomcat.apache.org/security-11.html"
    },
    {
      "type": "WEB",
      "url": "https://tomcat.apache.org/security-9.html"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/05/12/13"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Apache Tomcat - HTTP/2 request headers not validated"
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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