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CVE-2026-55957 Apache Tomcat

Affected softwareApache Tomcat
Severity7.3 High CVSS 3.1
Fixed in11.0.5, 10.1.37, 9.0.101
WeaknessCWE-304
Published29 Jun 2026
Updated25 Oct 2026

Description

Missing Critical Step in Authentication vulnerability in Apache Tomcat when the JNDIRealm was configured to authenticate binds using GSSAPI allowed attackers to authenticate without provided the correct password. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.4, from 10.1.0-M1 through 10.1.36, from 9.0.0.M1 through 9.0.100, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Users are recommended to upgrade to version 11.0.5, 10.1.37 or 9.0.101, which fixes the issue.

Exploitation status

No public exploit

No exploit has been reported in the sources we check. The 1 repository below are public GitHub repositories with fewer than 5 stars.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC 1 indexed, none at 5+ stars
  • EPSS 2.9% chance in 30 days

1 of these are GitHub repositories with fewer than 5 stars. They are listed for reference and don't count toward the exploitation status above.

IndexArtifactStarsFirst seen
GitHub PoC Reproducible Docker lab for the Apache Tomcat JNDIRealm GSSAPI authentication bypass 2026-08-07

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists: apache/tomcat 0cd21c0.

  • Protection none
  • Action unverified
  • Review automated Upstream data
  • Record active
Decided by Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all
Finding This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Patch Update October 2026 ↗ CPU 2026-Q4 Oracle Communications / Microservices (Apache Tomcat) (7.0.0)

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle Communications Microservices (Apache Tomcat) 7.0.0 7.0.0

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.apache.tomcat.embed:tomcat-embed-core 11.0.0-M1 11.0.5 unbounded
org.apache.tomcat.embed:tomcat-embed-core 10.1.0-M1 10.1.37 unbounded
org.apache.tomcat.embed:tomcat-embed-core 9.0.0.M1 9.0.101 unbounded
org.apache.tomcat.embed:tomcat-embed-core 8.5.0 none 8.5.100
org.apache.tomcat.embed:tomcat-embed-core 0 none 7.0.109
org.apache.tomcat:tomcat 11.0.0-M1 11.0.5 unbounded
org.apache.tomcat:tomcat 10.1.0-M1 10.1.37 unbounded
org.apache.tomcat:tomcat 9.0.0.M1 9.0.101 unbounded
org.apache.tomcat:tomcat 8.5.0 none 8.5.100
org.apache.tomcat:tomcat 0 none 7.0.109
org.apache.tomcat:tomcat-catalina 11.0.0-M1 11.0.5 unbounded
org.apache.tomcat:tomcat-catalina 10.1.0-M1 10.1.37 unbounded
org.apache.tomcat:tomcat-catalina 9.0.0.M1 9.0.101 unbounded
org.apache.tomcat:tomcat-catalina 8.5.0 none 8.5.100
org.apache.tomcat:tomcat-catalina 0 none 7.0.109

Products and versions

4 products, 18 version entries
SourceVendorProductSchemeAffected versions
nvd apache tomcat generic < 9.0.101 · ≥ 10.1.0 and < 10.1.37 · ≥ 11.0.0 and < 11.0.5
osv org.apache.tomcat tomcat generic ≤ 7.0.109 · ≥ 8.5.0 and ≤ 8.5.100 · ≥ 9.0.0 and < 9.0.101 · ≥ 10.1.0 and < 10.1.37 · ≥ 11.0.0 and < 11.0.5
osv org.apache.tomcat tomcat-catalina generic ≤ 7.0.109 · ≥ 8.5.0 and ≤ 8.5.100 · ≥ 9.0.0 and < 9.0.101 · ≥ 10.1.0 and < 10.1.37 · ≥ 11.0.0 and < 11.0.5
osv org.apache.tomcat.embed tomcat-embed-core generic ≤ 7.0.109 · ≥ 8.5.0 and ≤ 8.5.100 · ≥ 9.0.0 and < 9.0.101 · ≥ 10.1.0 and < 10.1.37 · ≥ 11.0.0 and < 11.0.5

References

URLTags
https://github.com/apache/tomcat/commit/0cd21c0393b8811af22daddbba7b4e7328e2d79e WEB
https://github.com/apache/tomcat/commit/c32bbd37ea9ee0aaab848af4ee1c9a76e84240ea WEB
https://github.com/apache/tomcat/commit/fd96ab415631eea44636c94f911dd38427070ef9 WEB
https://github.com/apache/tomcat PACKAGE
https://lists.apache.org/thread/7fk339o5jvd4mcgsf0chbrn4o525ccjh WEB
https://tomcat.apache.org/security-10.html WEB
https://tomcat.apache.org/security-11.html WEB
https://tomcat.apache.org/security-9.html WEB
http://www.openwall.com/lists/oss-security/2026/06/29/26 WEB

Timeline

Published2026-06-29By the CVE Program.
NVD record modified2026-10-25NVD's own last-modified date for this record.