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Apache Tomcat EUVDEUVD-2026-85227

| CVE-2026-77762 HIGH
Race Condition (CWE-362)
2026-09-23 apache GHSA-28v4-2v86-58cc
Apache Java Race Condition Code Injection Red Hat Tomcat Suse Apache Tomcat Apache Software Foundation
8.1
CVSS 3.1 · Vendor: apache
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Severity by source

Vendor (apache) PRIMARY
8.1 LOW
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
7.4 HIGH

Unauthenticated network vector but AC:H for the concurrency race; trailer injection into another request yields high integrity and confidentiality impact, but no clear availability impact justifies A:H.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
SUSE
3.7 LOW
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Red Hat
6.5 LOW
qualitative

Primary rating from Vendor (apache).

CVSS VectorVendor: apache

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

Lifecycle Timeline

6
Analysis Updated
Sep 23, 2026 - 16:32 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Sep 23, 2026 - 16:22 vuln.today
cvss_changed
CVSS changed
Sep 23, 2026 - 16:22 NVD
8.1 (HIGH)
Metadata Corrected
Sep 23, 2026 - 12:40 vuln.today
tag: Java added
Analysis Generated
Sep 23, 2026 - 11:50 vuln.today
CVE Published
Sep 23, 2026 - 11:19 cve.org
LOW

DescriptionCVE.org

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') vulnerability in Apache Tomcat allows an attacker to inject trailer fields into another HTTP/2 request.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.39 through 9.0.121.

The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.59 through 8.5.100. Other unsupported versions may also be affected.

Users are recommended to upgrade to version 11.0.26, 10.1.60, 9.0.122, which fix the issue.

AnalysisAI

Apache Tomcat's HTTP/2 connector harbors a race condition (CWE-362) that allows unauthenticated remote attackers to inject trailer fields into another user's concurrent HTTP/2 request, resulting in high confidentiality and integrity impact without affecting availability. Affected versions are 11.0.0-M1 through 11.0.25, 10.1.0-M1 through 10.1.59, 9.0.39 through 9.0.121, and the end-of-life 8.5.59 through 8.5.100; exploitation is conditional on winning a concurrency race and only applies when the HTTP/2 upgrade protocol is enabled and actively serving traffic. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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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 HTTP/2 connector (upgrade protocol) to be enabled and actively serving HTTP/2 traffic - the trailer-injection race exists in HTTP/2 request processing, so deployments serving only HTTP/1.1 are not exposed. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Signals are mixed and point to a credible-but-conditional threat. … 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 Upgrade to Apache Tomcat 11.0.26, 10.1.60, or 9.0.122, which contain the fix for this race condition. … Detailed patch versions, workarounds, and compensating controls in full report.
Sign in to read full assessment

Recommended ActionAI

Within 24 hours, inventory all Apache Tomcat deployments and identify instances running affected versions: 11.0.0-M1 through 11.0.25, 10.1.0-M1 through 10.1.59, 9.0.39 through 9.0.121, and 8.5.59 through 8.5.100; for any instance with the HTTP/2 upgrade protocol enabled, immediately disable it by removing the UpgradeProtocol element from the Connector configuration (or setting it to an empty value) and revert to HTTP/1.1 if HTTP/2 is not essential. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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Vendor StatusVendor

SUSE

Severity: Low
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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EUVD-2026-85227 vulnerability details – vuln.today
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