Advisory severityHigh7.5Red Hat Linux

High [CVE-2026-77791] Denial of Service via busy wait during WebSocket close

This high-severity Red Hat Linux advisory covers CVE-2026-77791; related products: Red Hat Hardened Images, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-77791 Source published Sep 23, 2026Source updated Sep 23, 2026

VulniPulse record published Sep 30, 2026Record updated Sep 30, 2026

CVE-2026-77791

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Summary

Denial of Service via busy wait during WebSocket close. Red Hat rates this important (CVSS 7.5).

Weakness: CWE-1050. Red Hat lists fixing advisory RHSA-2026:68257 with package tomcat11-main-11.0.26-0.1.hum1, tomcat10-main-10.1.60-0.1.hum1.

Affected products named by the advisory: Red Hat Hardened Images; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; and 4 more.

Affected products named by the advisory: Red Hat JBoss Web Server 5; Red Hat JBoss Web Server 6; Red Hat JBoss Web Server 7; Red Hat package: tomcat9.

Affected versions

11.0.0
11.0.25
10.1.8
10.1.59
9.0.74
9.0.121
8.5.88
8.5.100

Official advisory · high-confidence parse· fetched 6 days ago·verify at source

Fixed versions

tomcat11-main-11.0.26-0.1.hum1
tomcat10-main-10.1.60-0.1.hum1
RHSA-2026:68257

Official advisory · high-confidence parse· fetched 6 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Red Hat is not aware of a practical temporary workaround that fully mitigates this issue or meets Red Hat Product Security's standards for usability, deployment, applicability, or stability. Customers are advised to apply the relevant security updates when/if they become available.

Official advisory · high-confidence parse· fetched 6 days ago·verify at source

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