Is CVE-2026-55957 in the CISA KEV catalog?

No. CVE-2026-55957 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-55957?

CVE-2026-55957 has a CVSS v3 base score of 7.3 (HIGH).

What is the EPSS score for CVE-2026-55957?

CVE-2026-55957 has an EPSS score of 0.21% (12th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-55957?

Upgrade tomcat10 on debian 12 to 10.1.52-1~deb12u1 or later.

CVE & CISA-KEV Catalog

CVE-2026-55957

HIGH

7.3

CVSS v3

NVD

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.

CWE-304

How to fix

Remediation Available

tomcat10Debian

Fixed in:10.1.52-1~deb12u1CVE-2026-55957

Fixed in:10.1.52-1~deb13u1CVE-2026-55957

Fixed in:10.1.40-1CVE-2026-55957

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

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityLow

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Exploit Intelligence

0.21%probability of exploitation in 30 days

12thpercentile

Low risk: more likely to be exploited than 12% of all known CVEs.

References

Other references2

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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 2026-06-30.