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Apache Tomcat CVE-2026-78383

| EUVDEUVD-2026-85230 HIGH
Allocation of Resources Without Limits or Throttling (CWE-770)
2026-09-23 apache GHSA-rpxf-vjhq-9cv9
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 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
7.5 HIGH

Unauthenticated network AJP request (AV:N/PR:N/UI:N) causes thread-pool exhaustion, so availability-only A:H with no C/I impact; base metrics assume AJP enabled per CVSS scoping.

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 HIGH
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

4
CVSS changed
Sep 23, 2026 - 16:22 NVD
7.5 (HIGH)
Metadata Corrected
Sep 23, 2026 - 12:40 vuln.today
tag: Java added
Analysis Generated
Sep 23, 2026 - 12:16 vuln.today
CVE Published
Sep 23, 2026 - 11:23 cve.org
HIGH

DescriptionCVE.org

Allocation of resources without limits or throttling vulnerability in Apache Tomcat allows an unauthenticated AJP request to pin an AJP processing thread leading to denial of service.

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 7.0.0 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 allows an attacker to pin an AJP processing thread through a single AJP request, exhausting the connector's limited thread pool (CWE-770, allocation of resources without limits or throttling). The affected range is broad: 11.0.0-M1 through 11.0.25, 10.1.0-M1 through 10.1.59, 9.0.0.M1 through 9.0.121, plus the end-of-life branches 8.5.0-8.5.100 and 7.0.0-7.0.109, which remain affected even though they are no longer supported. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Delivery
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Exploit
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Execution
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Impact
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Vulnerability AssessmentAI

Exploitation Requires the Apache Tomcat AJP connector (Coyote/AJP, e.g. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment No CVSS vector, EPSS score, KEV listing, or public POC is present in the input, so severity signals must be inferred from the description and CWE-770. … 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, which the advisory states fix the issue; the correct target depends on which branch a deployment tracks, and the end-of-life 8.5.x and 7.0.x lines must be migrated to a supported branch because no fixes are being issued for them. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all Apache Tomcat deployments and determine whether the AJP connector is enabled and network-reachable; if AJP is not required, disable it immediately in server.xml. …

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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-2026-78383 vulnerability details – vuln.today
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