CVE-2026-19611: Wildfly-elytron: org.wildfly.security/wildfly-elytron-password-impl: wildfly-elytron: password keyspace reduction via nfkc fullwidth folding

Severity: high (CVSS 7.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-20 · updated 2026-10-26
Weakness: CWE-173

Description

A flaw was found in WildFly Elytron. Password hashing and verification normalize input with Unicode NFKC, which can collapse fullwidth characters to ASCII equivalents. A remote attacker can more easily guess affected passwords by using an ASCII-only dictionary against accounts whose passwords were intended to include those non-ASCII characters, leading to unauthorized access.

Affected products

Red Hat build of Keycloak 26.4: all versions
Red Hat Build of Apache Camel 3.33.3.SP2: all versions — fixed in 2.8.4.Final-redhat-00002
Red Hat build of Apache Camel 4 for Quarkus 3: all versions
Red Hat build of Debezium 3: all versions
Red Hat Data Grid 8: all versions
Red Hat JBoss Enterprise Application Platform 7: all versions
Red Hat JBoss Enterprise Application Platform 8: all versions
Red Hat Single Sign-On 7: all versions

How to fix

Upgrade to a fixed version: Red Hat Build of Apache Camel 3.33.3.SP2 2.8.4.Final-redhat-00002. Check the vendor advisory for mitigations.

References

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