GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

ALSA-2026:68677

Vulnerability from osv_almalinux – Published: 2026-09-17 00:00 – Updated: 2026-09-18 07:50 – Source website
VLAI
Summary
Important: tomcat security update
Details

Apache Tomcat is a servlet container for the Java Servlet and JavaServer Pages (JSP) technologies.

Security Fix(es):

  • tomcat-coyote: Apache Tomcat: Authentication bypass via digest authentication (CVE-2026-43512)
  • tomcat-coyote: Apache Tomcat: HTTP/2 request headers not validated (CVE-2026-41293)
  • tomcat-coyote: Apache Tomcat: Information disclosure due to HTTP Authentication Header exposure during WebSocket authentication. (CVE-2026-42498)
  • tomcat-coyote: tomcat: Improper Authorization allows security bypass (CVE-2026-43515)
  • tomcat-catalina: Apache Tomcat: Improper Handling of Case Sensitivity in LockOutRealm (CVE-2026-43513)
  • tomcat: Apache Tomcat: Authentication bypass via missing critical step in JNDIRealm GSSAPI configuration (CVE-2026-55957)
  • tomcat: Apache Tomcat: Security constraint bypass via improper URL encoding in rewrite valve (CVE-2026-59083)
  • tomcat: Apache Tomcat: Insufficient documentation for EncryptInterceptor may lead to insecure configurations (CVE-2026-59084)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

References
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "tomcat"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:9.0.120-1.el8_10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "tomcat-admin-webapps"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:9.0.120-1.el8_10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "tomcat-docs-webapp"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:9.0.120-1.el8_10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "tomcat-el-3.0-api"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:9.0.120-1.el8_10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "tomcat-jsp-2.3-api"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:9.0.120-1.el8_10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "tomcat-lib"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:9.0.120-1.el8_10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "tomcat-servlet-4.0-api"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:9.0.120-1.el8_10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "tomcat-webapps"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:9.0.120-1.el8_10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "Apache Tomcat is a servlet container for the Java Servlet and JavaServer Pages (JSP) technologies.  \n\nSecurity Fix(es):  \n\n  * tomcat-coyote: Apache Tomcat: Authentication bypass via digest authentication (CVE-2026-43512)\n  * tomcat-coyote: Apache Tomcat: HTTP/2 request headers not validated (CVE-2026-41293)\n  * tomcat-coyote: Apache Tomcat: Information disclosure due to HTTP Authentication Header exposure during WebSocket authentication. (CVE-2026-42498)\n  * tomcat-coyote: tomcat: Improper Authorization allows security bypass (CVE-2026-43515)\n  * tomcat-catalina: Apache Tomcat: Improper Handling of Case Sensitivity in LockOutRealm (CVE-2026-43513)\n  * tomcat: Apache Tomcat: Authentication bypass via missing critical step in JNDIRealm GSSAPI configuration (CVE-2026-55957)\n  * tomcat: Apache Tomcat: Security constraint bypass via improper URL encoding in rewrite valve (CVE-2026-59083)\n  * tomcat: Apache Tomcat: Insufficient documentation for EncryptInterceptor may lead to insecure configurations (CVE-2026-59084)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n",
  "id": "ALSA-2026:68677",
  "modified": "2026-09-18T07:50:52Z",
  "published": "2026-09-17T00:00:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:68677"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-41293"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-42498"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-43512"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-43513"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-43515"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-55957"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-59083"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-59084"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2476511"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2476513"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2476516"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2476519"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2476520"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2494669"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2499917"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2499931"
    },
    {
      "type": "ADVISORY",
      "url": "https://errata.almalinux.org/8/ALSA-2026-68677.html"
    }
  ],
  "related": [
    "CVE-2026-43512",
    "CVE-2026-41293",
    "CVE-2026-42498",
    "CVE-2026-43515",
    "CVE-2026-43513",
    "CVE-2026-55957",
    "CVE-2026-59083",
    "CVE-2026-59084"
  ],
  "summary": "Important: tomcat security update"
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.