CVE-2026-86350

EUVD-2026-85235

23.09.2026, 12:17

Inconsistent interpretation of HTTP/2 requests ('HTTP Request/Response smuggling') vulnerability in Apache Tomcat caused by a regression in fix for CVE-2026-41293 can trigger request header mix-up.

This issue affects Apache Tomcat: from 11.0.22 through 11.0.25, from 10.1.55 through 10.1.59, from 9.0.118 through 9.0.121.

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

HTTP Request/Response Smuggling

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
apache	CNA	9.1 CRITICAL	NETWORK	LOW	NONE	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Base Score

CVSS 3.x

EPSS Score

Percentile: 41.91%

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	11.0.22 ≤ 𝑥 ≤ 11.0.25	CNA
apache	tomcat	10.1.55 ≤ 𝑥 ≤ 10.1.59	CNA
apache	tomcat	9.0.118 ≤ 𝑥 ≤ 9.0.121	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-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

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/mss45z99lcdd5dtpgcn45dy82f3toswc