CVE-2026-77762

EUVD-2026-85227

23.09.2026, 12:17

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.

Race Condition

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
apache	CNA	8.1 HIGH	NETWORK	HIGH	NONE	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Base Score

CVSS 3.x

EPSS Score

Percentile: 40.43%

Early Detection

Affected products identified ahead of NVD analysis through intelligence sources (CNA/ADP records, vendor advisories, Enginsight analysis).

Vendor	Product	Version	Source
apache	tomcat	𝑥 ≤ 11.0.25	CNA
apache	tomcat	𝑥 ≤ 10.1.59	CNA
apache	tomcat	9.0.39 ≤ 𝑥 ≤ 9.0.121	CNA
apache	tomcat	8.5.59 ≤ 𝑥 ≤ 8.5.100	CNA

Debian Releases

Debian Product

Codename

tomcat10

bookworm	vulnerable
bookworm (security)	vulnerable
forky	10.1.60-1 fixed
sid	10.1.60-1 fixed
trixie	vulnerable
trixie (security)	vulnerable

tomcat11

forky	vulnerable
sid	vulnerable
trixie	vulnerable
trixie (security)	vulnerable

tomcat9

bookworm	9.0.70-2 fixed
forky	9.0.122-1 fixed
sid	9.0.122-1 fixed
trixie	9.0.95-1 fixed

Ubuntu Releases

Ubuntu Product

Codename

tomcat6

jammy	dne
noble	dne
resolute	dne
stonking	dne
trusty	needs-triage
xenial	not-affected

tomcat7

bionic	not-affected
jammy	dne
noble	dne
resolute	dne
stonking	dne
trusty	needs-triage
xenial	needs-triage

tomcat8

bionic	needs-triage
jammy	dne
noble	dne
resolute	dne
stonking	dne
xenial	needs-triage

tomcat9

bionic	needs-triage
focal	needs-triage
jammy	needs-triage
noble	needs-triage
resolute	needs-triage
stonking	needs-triage

tomcat10

jammy	dne
noble	needs-triage
resolute	needs-triage
stonking	needs-triage

tomcat11

jammy	dne
noble	dne
resolute	needs-triage
stonking	needs-triage

openSUSE / SLES Releases

openSUSE Product

Release

libapr1

suse enterprise sap 12 SP5	1.6.5-4.13.1 fixed
suse enterprise server 12 SP5	1.6.5-4.13.1 fixed

libapr1-devel

suse enterprise sap 12 SP5	1.6.5-4.13.1 fixed
suse enterprise server 12 SP5	1.6.5-4.13.1 fixed

libtcnative-1-0

suse enterprise sap 12 SP5	1.3.9-3.9.1 fixed
suse enterprise sap 15 SP4	1.3.9-150200.6.11.2 fixed
suse enterprise sap 15 SP5	1.3.9-150200.6.11.2 fixed
suse enterprise sap 15 SP6	1.3.9-150600.16.9.2 fixed
suse enterprise server 12 SP5	1.3.9-3.9.1 fixed
suse enterprise server 15 SP4	1.3.9-150200.6.11.2 fixed
suse enterprise server 15 SP5	1.3.9-150200.6.11.2 fixed
suse enterprise server 15 SP6	1.3.9-150600.16.9.2 fixed

libtcnative-1-0-devel

suse enterprise sap 12 SP5	1.3.9-3.9.1 fixed
suse enterprise sap 15 SP4	1.3.9-150200.6.11.2 fixed
suse enterprise sap 15 SP5	1.3.9-150200.6.11.2 fixed
suse enterprise sap 15 SP6	1.3.9-150600.16.9.2 fixed
suse enterprise sap 15 SP7	1.3.9-150600.16.9.2 fixed
suse enterprise server 12 SP5	1.3.9-3.9.1 fixed
suse enterprise server 15 SP4	1.3.9-150200.6.11.2 fixed
suse enterprise server 15 SP5	1.3.9-150200.6.11.2 fixed
suse enterprise server 15 SP6	1.3.9-150600.16.9.2 fixed
suse enterprise server 15 SP7	1.3.9-150600.16.9.2 fixed

tomcat

suse enterprise sap 12 SP5	9.0.123-3.182.2 fixed
suse enterprise sap 15 SP4	9.0.122-150200.123.2 fixed
suse enterprise sap 15 SP5	9.0.122-150200.123.2 fixed
suse enterprise sap 15 SP6	9.0.122-150200.123.2 fixed
suse enterprise sap 15 SP7	9.0.122-150200.123.2 fixed
suse enterprise server 12 SP5	9.0.123-3.182.2 fixed
suse enterprise server 15 SP4	9.0.122-150200.123.2 fixed
suse enterprise server 15 SP5	9.0.122-150200.123.2 fixed
suse enterprise server 15 SP6	9.0.122-150200.123.2 fixed
suse enterprise server 15 SP7	9.0.122-150200.123.2 fixed

tomcat-admin-webapps

suse enterprise sap 12 SP5	9.0.123-3.182.2 fixed
suse enterprise sap 15 SP4	9.0.122-150200.123.2 fixed
suse enterprise sap 15 SP5	9.0.122-150200.123.2 fixed
suse enterprise sap 15 SP6	9.0.122-150200.123.2 fixed
suse enterprise sap 15 SP7	9.0.122-150200.123.2 fixed
suse enterprise server 12 SP5	9.0.123-3.182.2 fixed
suse enterprise server 15 SP4	9.0.122-150200.123.2 fixed
suse enterprise server 15 SP5	9.0.122-150200.123.2 fixed
suse enterprise server 15 SP6	9.0.122-150200.123.2 fixed
suse enterprise server 15 SP7	9.0.122-150200.123.2 fixed

tomcat-docs-webapp

suse enterprise sap 12 SP5	9.0.123-3.182.2 fixed
suse enterprise server 12 SP5	9.0.123-3.182.2 fixed

tomcat-el-3_0-api

suse enterprise sap 12 SP5	9.0.123-3.182.2 fixed
suse enterprise sap 15 SP4	9.0.122-150200.123.2 fixed
suse enterprise sap 15 SP5	9.0.122-150200.123.2 fixed
suse enterprise sap 15 SP6	9.0.122-150200.123.2 fixed
suse enterprise sap 15 SP7	9.0.122-150200.123.2 fixed
suse enterprise server 12 SP5	9.0.123-3.182.2 fixed
suse enterprise server 15 SP4	9.0.122-150200.123.2 fixed
suse enterprise server 15 SP5	9.0.122-150200.123.2 fixed
suse enterprise server 15 SP6	9.0.122-150200.123.2 fixed
suse enterprise server 15 SP7	9.0.122-150200.123.2 fixed

tomcat-javadoc

suse enterprise sap 12 SP5	9.0.123-3.182.2 fixed
suse enterprise server 12 SP5	9.0.123-3.182.2 fixed

tomcat-jsp-2_3-api

suse enterprise sap 12 SP5	9.0.123-3.182.2 fixed
suse enterprise sap 15 SP4	9.0.122-150200.123.2 fixed
suse enterprise sap 15 SP5	9.0.122-150200.123.2 fixed
suse enterprise sap 15 SP6	9.0.122-150200.123.2 fixed
suse enterprise sap 15 SP7	9.0.122-150200.123.2 fixed
suse enterprise server 12 SP5	9.0.123-3.182.2 fixed
suse enterprise server 15 SP4	9.0.122-150200.123.2 fixed
suse enterprise server 15 SP5	9.0.122-150200.123.2 fixed
suse enterprise server 15 SP6	9.0.122-150200.123.2 fixed
suse enterprise server 15 SP7	9.0.122-150200.123.2 fixed

tomcat-lib

suse enterprise sap 12 SP5	9.0.123-3.182.2 fixed
suse enterprise sap 15 SP4	9.0.122-150200.123.2 fixed
suse enterprise sap 15 SP5	9.0.122-150200.123.2 fixed
suse enterprise sap 15 SP6	9.0.122-150200.123.2 fixed
suse enterprise sap 15 SP7	9.0.122-150200.123.2 fixed
suse enterprise server 12 SP5	9.0.123-3.182.2 fixed
suse enterprise server 15 SP4	9.0.122-150200.123.2 fixed
suse enterprise server 15 SP5	9.0.122-150200.123.2 fixed
suse enterprise server 15 SP6	9.0.122-150200.123.2 fixed
suse enterprise server 15 SP7	9.0.122-150200.123.2 fixed

tomcat-servlet-4_0-api

suse enterprise sap 12 SP5	9.0.123-3.182.2 fixed
suse enterprise sap 15 SP4	9.0.122-150200.123.2 fixed
suse enterprise sap 15 SP5	9.0.122-150200.123.2 fixed
suse enterprise sap 15 SP6	9.0.122-150200.123.2 fixed
suse enterprise sap 15 SP7	9.0.122-150200.123.2 fixed
suse enterprise server 12 SP5	9.0.123-3.182.2 fixed
suse enterprise server 15 SP4	9.0.122-150200.123.2 fixed
suse enterprise server 15 SP5	9.0.122-150200.123.2 fixed
suse enterprise server 15 SP6	9.0.122-150200.123.2 fixed
suse enterprise server 15 SP7	9.0.122-150200.123.2 fixed

tomcat-webapps

suse enterprise sap 12 SP5	9.0.123-3.182.2 fixed
suse enterprise sap 15 SP4	9.0.122-150200.123.2 fixed
suse enterprise sap 15 SP5	9.0.122-150200.123.2 fixed
suse enterprise sap 15 SP6	9.0.122-150200.123.2 fixed
suse enterprise sap 15 SP7	9.0.122-150200.123.2 fixed
suse enterprise server 12 SP5	9.0.123-3.182.2 fixed
suse enterprise server 15 SP4	9.0.122-150200.123.2 fixed
suse enterprise server 15 SP5	9.0.122-150200.123.2 fixed
suse enterprise server 15 SP6	9.0.122-150200.123.2 fixed
suse enterprise server 15 SP7	9.0.122-150200.123.2 fixed

tomcat10

suse enterprise sap 15 SP5	10.1.60-150200.5.82.2 fixed
suse enterprise sap 15 SP6	10.1.60-150200.5.82.2 fixed
suse enterprise sap 15 SP7	10.1.60-150200.5.82.2 fixed
suse enterprise server 15 SP5	10.1.60-150200.5.82.2 fixed
suse enterprise server 15 SP6	10.1.60-150200.5.82.2 fixed
suse enterprise server 15 SP7	10.1.60-150200.5.82.2 fixed

tomcat10-admin-webapps

suse enterprise sap 15 SP5	10.1.60-150200.5.82.2 fixed
suse enterprise sap 15 SP6	10.1.60-150200.5.82.2 fixed
suse enterprise sap 15 SP7	10.1.60-150200.5.82.2 fixed
suse enterprise server 15 SP5	10.1.60-150200.5.82.2 fixed
suse enterprise server 15 SP6	10.1.60-150200.5.82.2 fixed
suse enterprise server 15 SP7	10.1.60-150200.5.82.2 fixed

tomcat10-el-5_0-api

suse enterprise sap 15 SP5	10.1.60-150200.5.82.2 fixed
suse enterprise sap 15 SP6	10.1.60-150200.5.82.2 fixed
suse enterprise sap 15 SP7	10.1.60-150200.5.82.2 fixed
suse enterprise server 15 SP5	10.1.60-150200.5.82.2 fixed
suse enterprise server 15 SP6	10.1.60-150200.5.82.2 fixed
suse enterprise server 15 SP7	10.1.60-150200.5.82.2 fixed

tomcat10-jsp-3_1-api

suse enterprise sap 15 SP5	10.1.60-150200.5.82.2 fixed
suse enterprise sap 15 SP6	10.1.60-150200.5.82.2 fixed
suse enterprise sap 15 SP7	10.1.60-150200.5.82.2 fixed
suse enterprise server 15 SP5	10.1.60-150200.5.82.2 fixed
suse enterprise server 15 SP6	10.1.60-150200.5.82.2 fixed
suse enterprise server 15 SP7	10.1.60-150200.5.82.2 fixed

tomcat10-lib

suse enterprise sap 15 SP5	10.1.60-150200.5.82.2 fixed
suse enterprise sap 15 SP6	10.1.60-150200.5.82.2 fixed
suse enterprise sap 15 SP7	10.1.60-150200.5.82.2 fixed
suse enterprise server 15 SP5	10.1.60-150200.5.82.2 fixed
suse enterprise server 15 SP6	10.1.60-150200.5.82.2 fixed
suse enterprise server 15 SP7	10.1.60-150200.5.82.2 fixed

tomcat10-servlet-6_0-api

suse enterprise sap 15 SP5	10.1.60-150200.5.82.2 fixed
suse enterprise sap 15 SP6	10.1.60-150200.5.82.2 fixed
suse enterprise sap 15 SP7	10.1.60-150200.5.82.2 fixed
suse enterprise server 15 SP5	10.1.60-150200.5.82.2 fixed
suse enterprise server 15 SP6	10.1.60-150200.5.82.2 fixed
suse enterprise server 15 SP7	10.1.60-150200.5.82.2 fixed

tomcat10-webapps

suse enterprise sap 15 SP5	10.1.60-150200.5.82.2 fixed
suse enterprise sap 15 SP6	10.1.60-150200.5.82.2 fixed
suse enterprise sap 15 SP7	10.1.60-150200.5.82.2 fixed
suse enterprise server 15 SP5	10.1.60-150200.5.82.2 fixed
suse enterprise server 15 SP6	10.1.60-150200.5.82.2 fixed
suse enterprise server 15 SP7	10.1.60-150200.5.82.2 fixed

tomcat11

suse enterprise sap 15 SP6	11.0.26-150600.13.36.2 fixed
suse enterprise sap 15 SP7	11.0.26-150600.13.36.2 fixed
suse enterprise server 15 SP6	11.0.26-150600.13.36.2 fixed
suse enterprise server 15 SP7	11.0.26-150600.13.36.2 fixed

tomcat11-admin-webapps

suse enterprise sap 15 SP6	11.0.26-150600.13.36.2 fixed
suse enterprise sap 15 SP7	11.0.26-150600.13.36.2 fixed
suse enterprise server 15 SP6	11.0.26-150600.13.36.2 fixed
suse enterprise server 15 SP7	11.0.26-150600.13.36.2 fixed

tomcat11-el-6_0-api

suse enterprise sap 15 SP6	11.0.26-150600.13.36.2 fixed
suse enterprise sap 15 SP7	11.0.26-150600.13.36.2 fixed
suse enterprise server 15 SP6	11.0.26-150600.13.36.2 fixed
suse enterprise server 15 SP7	11.0.26-150600.13.36.2 fixed

tomcat11-jsp-4_0-api

suse enterprise sap 15 SP6	11.0.26-150600.13.36.2 fixed
suse enterprise sap 15 SP7	11.0.26-150600.13.36.2 fixed
suse enterprise server 15 SP6	11.0.26-150600.13.36.2 fixed
suse enterprise server 15 SP7	11.0.26-150600.13.36.2 fixed

tomcat11-lib

suse enterprise sap 15 SP6	11.0.26-150600.13.36.2 fixed
suse enterprise sap 15 SP7	11.0.26-150600.13.36.2 fixed
suse enterprise server 15 SP6	11.0.26-150600.13.36.2 fixed
suse enterprise server 15 SP7	11.0.26-150600.13.36.2 fixed

tomcat11-servlet-6_1-api

suse enterprise sap 15 SP6	11.0.26-150600.13.36.2 fixed
suse enterprise sap 15 SP7	11.0.26-150600.13.36.2 fixed
suse enterprise server 15 SP6	11.0.26-150600.13.36.2 fixed
suse enterprise server 15 SP7	11.0.26-150600.13.36.2 fixed

tomcat11-webapps

suse enterprise sap 15 SP6	11.0.26-150600.13.36.2 fixed
suse enterprise sap 15 SP7	11.0.26-150600.13.36.2 fixed
suse enterprise server 15 SP6	11.0.26-150600.13.36.2 fixed
suse enterprise server 15 SP7	11.0.26-150600.13.36.2 fixed

Amazon Linux Releases

Amazon Package

Release

tomcat10

Amazon Linux 2023

1:10.1.60-1.amzn2023.0.1

fixed

tomcat10-admin-webapps

Amazon Linux 2023

1:10.1.60-1.amzn2023.0.1

fixed

tomcat10-docs-webapp

Amazon Linux 2023

1:10.1.60-1.amzn2023.0.1

fixed

tomcat10-el-5.0-api

Amazon Linux 2023

1:10.1.60-1.amzn2023.0.1

fixed

tomcat10-jsp-3.1-api

Amazon Linux 2023

1:10.1.60-1.amzn2023.0.1

fixed

tomcat10-lib

Amazon Linux 2023

1:10.1.60-1.amzn2023.0.1

fixed

tomcat10-servlet-6.0-api

Amazon Linux 2023

1:10.1.60-1.amzn2023.0.1

fixed

tomcat10-webapps

Amazon Linux 2023

1:10.1.60-1.amzn2023.0.1

fixed

tomcat11

Amazon Linux 2023

1:11.0.26-1.amzn2023.0.1

fixed

tomcat11-admin-webapps

Amazon Linux 2023

1:11.0.26-1.amzn2023.0.1

fixed

tomcat11-docs-webapp

Amazon Linux 2023

1:11.0.26-1.amzn2023.0.1

fixed

tomcat11-el-6.0-api

Amazon Linux 2023

1:11.0.26-1.amzn2023.0.1

fixed

tomcat11-jsp-4.0-api

Amazon Linux 2023

1:11.0.26-1.amzn2023.0.1

fixed

tomcat11-lib

Amazon Linux 2023

1:11.0.26-1.amzn2023.0.1

fixed

tomcat11-servlet-6.1-api

Amazon Linux 2023

1:11.0.26-1.amzn2023.0.1

fixed

tomcat11-webapps

Amazon Linux 2023

1:11.0.26-1.amzn2023.0.1

fixed

tomcat9

Amazon Linux 2023

1:9.0.122-1.amzn2023.0.1

fixed

tomcat9-admin-webapps

Amazon Linux 2023

1:9.0.122-1.amzn2023.0.1

fixed

tomcat9-docs-webapp

Amazon Linux 2023

1:9.0.122-1.amzn2023.0.1

fixed

tomcat9-el-3.0-api

Amazon Linux 2023

1:9.0.122-1.amzn2023.0.1

fixed

tomcat9-jsp-2.3-api

Amazon Linux 2023

1:9.0.122-1.amzn2023.0.1

fixed

tomcat9-lib

Amazon Linux 2023

1:9.0.122-1.amzn2023.0.1

fixed

tomcat9-servlet-4.0-api

Amazon Linux 2023

1:9.0.122-1.amzn2023.0.1

fixed

tomcat9-webapps

Amazon Linux 2023

1:9.0.122-1.amzn2023.0.1

fixed

Common Weakness Enumeration

CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
The program contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently.

Vulnerability Media Exposure

[GERMAN] Apache Tomcat: Mehrere Schwachstellen
Ein Angreifer kann mehrere Schwachstellen in Apache Tomcat ausnutzen, um Sicherheitsvorkehrungen zu umgehen, um einen Denial of Service Angriff durchzuführen und um Daten zu manipulieren.
Published: 2026-09-22T22:00:00+00:00

References

https://lists.apache.org/thread/y5r9fvjo7ol24mkoyoc0st8bqrfyqcyn

http://www.openwall.com/lists/oss-security/2026/09/23/23