CVE-2026-77791

Severity: Important

Published: 2026-09-23

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,...

Exploit evidence

No public exploit evidence reported by NVD

Last checked: 2026-09-23 22:18 UTC

No exploitation evidence · CISA Coordinator (Assessed 2026-09-23 12:44 UTC)

NVD evidence for CVE-2026-77791 is reported, not independently verified by Package Alert. It does not establish exploit reliability or applicability to a particular package or environment.

References

Fix Status by Distribution

Fix evidence last checked: 2026-10-07 09:30 UTC

Fixed in:

Debian 12 (Bookworm)
- Debian Security Tracker · Observed 2026-09-23
Debian 13 (Trixie)
- Debian Security Tracker · Observed 2026-09-23
SUSE Linux Enterprise Server 15 SP5
- SUSE-SU-2026:4546 · Published 2026-10-06
SUSE Linux Enterprise Server 15 SP6
- SUSE-SU-2026:4546 · Published 2026-10-06
- SUSE-SU-2026:4544 · Published 2026-10-06
SUSE Linux Enterprise Server 15 SP7
- SUSE-SU-2026:4546 · Published 2026-10-06
- SUSE-SU-2026:4544 · Published 2026-10-06
SUSE Linux Enterprise Server 16
- SUSE-SU-2026:23985 · Published 2026-09-30

No fix evidence found:

AlmaLinux 10

AlmaLinux 8

AlmaLinux 9

Debian 11 (Bullseye)

Oracle Linux 10

Oracle Linux 8

Oracle Linux 9

Red Hat Enterprise Linux 10

Red Hat Enterprise Linux 7 (Extended Lifecycle Support)

Red Hat Enterprise Linux 8

Red Hat Enterprise Linux 9

Rocky Linux 10

Rocky Linux 8

Rocky Linux 9

SUSE Linux Enterprise Server 12 SP5

Ubuntu 22.04 LTS (Jammy Jellyfish)

Ubuntu 24.04 LTS (Noble Numbat)

Ubuntu 25.04 (Plucky Puffin)

Ubuntu 25.10 (Questing Quokka)

Ubuntu 26.04 LTS (Resolute Raccoon)

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