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01 Record

CVE-2026-55957

Apache Tomcat: Authentication bypass with JNDIRealm and GSSAPI authenticated bind

HighPUBLISHEDCNA: apache
CNA base score7.3 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
View raw JSON

02 Description

Apache Tomcat: Authentication bypass with JNDIRealm and GSSAPI authenticated bind

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
2.85% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 86.6% of scored records. A rank, not a probability.
NVD base score
7.3 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
NVD analysis status
Analyzed. NVD last modified this record on 2026-10-25.
Red Hat severity
Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-06-29 20:47Z4 MO AGO
Last updated
2026-06-30 13:27Z4 MO AGO
Reserved
2026-06-17
Assigning CNA
apache
Record state
PUBLISHED
Severity
High (CVSS 7.3)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Weaknesses
  • CWE-304Missing Critical Step in AuthenticationBase
  • CWE-305Authentication Bypass by Primary WeaknessBase
Data version
5.2
Document digest
1f97cc6f97ca7efe72b2da1127abac2d9b641010b49c05e01d3cd49a98bc270d

05 Affected products

VendorProductVersionsPlatforms
Apache Software FoundationApache Tomcat11.0.0-M1 to 11.0.4, 10.1.0-M1 to 10.1.36, 9.0.0.M1 to 9.0.100, 8.5.0 to 8.5.100, 7.0.0 to 7.0.109—

06 References

07 Fixed in

AlmaLinux 8

  • tomcat
    Fixed in 1:9.0.120-1.el8_10
  • tomcat-admin-webapps
    Fixed in 1:9.0.120-1.el8_10
  • tomcat-docs-webapp
    Fixed in 1:9.0.120-1.el8_10
  • tomcat-el-3.0-api
    Fixed in 1:9.0.120-1.el8_10
  • tomcat-jsp-2.3-api
    Fixed in 1:9.0.120-1.el8_10
  • tomcat-lib
    Fixed in 1:9.0.120-1.el8_10
  • tomcat-servlet-4.0-api
    Fixed in 1:9.0.120-1.el8_10
  • tomcat-webapps
    Fixed in 1:9.0.120-1.el8_10

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 8

  • tomcat
    Fixed in 1:9.0.120-1.el8_10
  • tomcat-admin-webapps
    Fixed in 1:9.0.120-1.el8_10
  • tomcat-docs-webapp
    Fixed in 1:9.0.120-1.el8_10
  • tomcat-el-3.0-api
    Fixed in 1:9.0.120-1.el8_10
  • tomcat-jsp-2.3-api
    Fixed in 1:9.0.120-1.el8_10
  • tomcat-lib
    Fixed in 1:9.0.120-1.el8_10
  • tomcat-servlet-4.0-api
    Fixed in 1:9.0.120-1.el8_10
  • tomcat-webapps
    Fixed in 1:9.0.120-1.el8_10

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • tomcat10
    Fixed in 10.1.52-1~deb12u1
  • tomcat9
    Fixed in 9.0.70-2

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • tomcat10
    Fixed in 10.1.52-1~deb13u1
  • tomcat11
    Fixed in 11.0.15-1~deb13u1
  • tomcat9
    Fixed in 9.0.70-2

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • tomcat10
    Fixed in 10.1.40-1
  • tomcat11
    Fixed in 11.0.5-1
  • tomcat9
    Fixed in 9.0.70-2

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 24.04 LTS

  • tomcat10
    No fix yet
  • tomcat9
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 25.10

  • tomcat10
    No fix yet
  • tomcat11
    No fix yet
  • tomcat9
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 26.04 LTS

  • tomcat10
    No fix yet
  • tomcat11
    No fix yet
  • tomcat9
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 26.10

  • tomcat10
    No fix yet
  • tomcat11
    No fix yet
  • tomcat9
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 14.04 LTS

  • tomcat6
    No fix yet
  • tomcat7
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 16.04 LTS

  • tomcat7
    No fix yet
  • tomcat8
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 18.04 LTS

  • tomcat8
    No fix yet
  • tomcat9
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 20.04 LTS

  • tomcat9
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 22.04 LTS

  • tomcat9
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.