SB2026091578 - Improper Handling of Alternate Encoding in Wildfly Elytron

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Main Vulnerability Database SB2026091578

SB2026091578 - Improper Handling of Alternate Encoding in Wildfly Elytron

Published: September 15, 2026

Security Bulletin ID SB2026091578
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper Handling of Alternate Encoding (CVE-ID: CVE-2026-19611)

CWE-ID: CWE-173 - Improper Handling of Alternate Encoding

CVSSv4: 9.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to gain unauthorized access to affected accounts.

The vulnerability exists due to improper handling of alternate encoding in password hashing and verification when normalizing passwords with Unicode NFKC. A remote attacker can use an ASCII-only dictionary to guess passwords intended to contain fullwidth non-ASCII characters to gain unauthorized access to affected accounts.

The issue affects passwords containing characters subject to NFKC compatibility folding.


Remediation

Install update from vendor's website.

References