Input Normalization Flaw in WildFly Elytron Affects Authentication Security
CVE-2026-19611

7.4HIGH

Key Information:

Vendor

Red Hat
Status
Red Hat Build Of Apache Camel 4 For Quarkus 3
Red Hat Build Of Debezium 3
Red Hat Build Of Keycloak
Red Hat Build Of Quarkus
Vendor
CVE Published:
20 August 2026

What is CVE-2026-19611?

A flaw exists in WildFly Elytron, where password hashing and verification processes normalize input using Unicode NFKC. This normalization can inadvertently convert fullwidth characters into their ASCII equivalents. As a result, remote attackers can exploit this weakness by leveraging ASCII-only dictionaries to guess passwords that were originally intended to include non-ASCII characters. This puts users at risk, as it leads to a heightened chance of unauthorized access to accounts.

References

https://access.redhat.com/security/cve/CVE-2026-19611
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2514568
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
7.4
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Upstream acknowledges LiuBo-keep (aidan) as the original reporter.
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