Authentication Bypass via NUL Character in Username
Summary
Authentication Bypass via NUL Character in Username. Red Hat rates this important (CVSS 7.1). Weakness: CWE-170. Affected package(s): rhui5/installer-rhel9:1781525693, libtasn1, gnutls, rhui5/cds-rhel9:1781525684, discovery/discovery-ui-rhel9:1782166952, discovery/discovery-server-rhel9:1782159791. Resolved in Red Hat advisory RHSA-2026:20613 — update the affected packages (`sudo dnf update`).
- rhui5/installer-rhel9:1781525693
- libtasn1-0:4.13-3.el8_6.2
- gnutls-0:3.6.16-7.el8_8.4
- gnutls-0:3.8.10-4.el10_2
- rhui5/cds-rhel9:1781525684
- libtasn1-0:4.13-4.el8_8.1
- discovery/discovery-ui-rhel9:1782166952
- discovery/discovery-server-rhel9:1782159791
- gnutls-0:3.8.3-6.el9_6.4
- gnutls-0:3.6.16-8.el8_10.6
- rhui5/rhua-rhel9:1781525739
- gnutls-main-3.8.13-1.hum1
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
- RHSA-2026:20613
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
Mitigation checklist
- Update the affected package(s) to the fixed version shipped in RHSA-2026:20613 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
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