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CVE-2026-77791

Apache Tomcat: DoS via busy wait during WebSocket close

cve-program · severity unknownCVSS unknownCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-77791

Published

Uncontrolled Resource Consumption vulnerability in Apache Tomcat during sending of WebSocket close message enabled a DoS attack. This issue affects Apache Tomcat: from 11.0.0-M5 through 11.0.25, from 10.1.8 through 10.1.59, from 9.0.74 through 9.0.121. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.88 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-77791

Published

Apache Tomcat

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Apache Software Foundation",
                    "product": "Apache Tomcat",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "11.0.0-M5",
                            "lessThanOrEqual": "11.0.25",
                            "versionType": "semver"
                        },
                        {
                            "status": "affected",
                            "version": "10.1.8",
                            "lessThanOrEqual": "10.1.59",
                            "versionType": "semver"
                        },
                        {
                            "status": "affected",
                            "version": "9.0.74",
                            "lessThanOrEqual": "9.0.121",
                            "versionType": "semver"
                        },
                        {
                            "status": "affected",
                            "version": "8.5.88",
                            "lessThanOrEqual": "8.5.100",
                            "versionType": "semver"
                        },
                        {
                            "status": "unaffected",
                            "version": "0",
                            "lessThanOrEqual": "7.0.109",
                            "versionType": "semver"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON