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Apache Tomcat CVE-2026-79677

| EUVDEUVD-2026-85232 HIGH
Missing Release of Resource after Effective Lifetime (CWE-772)
2026-09-23 apache GHSA-r5gx-4gq8-822g
Denial Of Service Apache Java Red Hat Tomcat Suse Apache Tomcat Apache Software Foundation
7.5
CVSS 3.1 · Vendor: apache
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Severity by source

Vendor (apache) PRIMARY
7.5 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
7.5 HIGH

Remote unauthenticated repeatable resource leak causing availability loss only; low complexity for reachable WebSocket endpoints, no confidentiality or integrity impact.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative
Red Hat
7.5 MEDIUM
qualitative

Primary rating from Vendor (apache).

CVSS VectorVendor: apache

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

7
Analysis Updated
Sep 23, 2026 - 17:28 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Sep 23, 2026 - 17:22 vuln.today
cvss_changed
Severity Changed
Sep 23, 2026 - 17:22 NVD
MEDIUM HIGH
CVSS changed
Sep 23, 2026 - 17:22 NVD
7.5 (MEDIUM) 7.5 (HIGH)
Metadata Corrected
Sep 23, 2026 - 12:40 vuln.today
tag: Java added
Analysis Generated
Sep 23, 2026 - 12:18 vuln.today
CVE Published
Sep 23, 2026 - 11:28 cve.org
MEDIUM

DescriptionCVE.org

Missing release of resource after effective lifetime, Comparison using wrong factors vulnerability in Apache Tomcat allows a denial of service as a result of lost time outs for asynchronous WebSocket writes.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.0.M1 through 9.0.121.

The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100, from 7.0.43 through 7.0.109. 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.

AnalysisAI

Denial of service in Apache Tomcat's asynchronous WebSocket write path allows remote, unauthenticated attackers to exhaust server resources by triggering lost write timeouts, so non-blocking WebSocket sends are never released after their effective lifetime. All maintained branches are affected - 11.0.0-M1 through 11.0.25, 10.1.0-M1 through 10.1.59, and 9.0.0.M1 through 9.0.121, plus the end-of-life 8.5.0-8.5.100 and 7.0.43-7.0.109 lines - although exposure is bounded to instances whose deployed applications actually perform asynchronous (non-blocking) WebSocket writes; servers with no WebSocket endpoints or only synchronous writes are not exposed. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Vulnerability AssessmentAI

Exploitation Exploitation requires the deployed application to use Apache Tomcat's WebSocket support with asynchronous (non-blocking) writes - the flaw is a lost write-timeout / resource-release failure on that async WebSocket write path. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment All signals point to a real but bounded availability-only issue rather than a top-tier emergency. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Vendor-released patch: upgrade to Apache Tomcat 11.0.26, 10.1.60, or 9.0.122 - the exact fixed versions named in the Apache advisory at https://lists.apache.org/thread/bzwps6ck4szf2hmksbbon3syyl9qnkv8 - choosing the release that matches the branch already deployed and applying it to every node behind the load balancer, since pooled or sticky-session clusters will otherwise retain unpatched backends that can still be driven into resource exhaustion. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all Apache Tomcat installations and identify versions in the affected ranges (11.0.0-M1 through 11.0.25, 10.1.0-M1 through 10.1.59, 9.0.0.M1 through 9.0.121, 8.5.0 through 8.5.100, 7.0.43 through 7.0.109); for each instance, determine whether any deployed application performs asynchronous (non-blocking) WebSocket writes, as only those are exposed; immediately disable asynchronous WebSocket write functionality or switch applications to synchronous writes where feasible, and enable resource monitoring and alerting on Tomcat connector threads and memory. …

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise Module for Basesystem 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Fixed

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CVE-2026-79677 vulnerability details – vuln.today
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