CVE-2026-55957
HIGHEPSS 85th pctlDescription
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.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Exploit Intelligence
Elevated risk: more likely to be exploited than 85% of all known CVEs.
References
Related Vulnerabilities
Other CWE-304 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2022-1065 | High | 8.1 | 2.8% | - | Fix |
| CVE-2022-2302 | Critical | 9.8 | 1.9% | - | Fix |
| CVE-2024-2172 | Critical | 9.8 | 1.7% | - | - |
| CVE-2019-16766 | High | 8.7 | 1.5% | - | Fix |
| CVE-2021-41179 | Medium | 6.5 | 1.2% | - | Fix |
| CVE-2022-2821 | High | 7.5 | 1.1% | - | Fix |
Common questions
How do I fix CVE-2026-55957?
Upgrade tomcat10 on debian 12 to 10.1.52-1~deb12u1 or later.
Is CVE-2026-55957 being actively exploited?
Not that we know of. CVE-2026-55957 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 2.9% is the estimated probability that it will be exploited in the next 30 days. That is higher than 85% of all scored CVEs.
How severe is CVE-2026-55957?
CVE-2026-55957 has a CVSS v3 base score of 7.3, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-55957 affect?
Published advisories record a fix for tomcat10 (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
Embed a live status badge for CVE-2026-55957
Markdown
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-02.