Vulnerability Report

CVE-2026-86350

Title: Apache Tomcat HTTP/2 Request Smuggling

Other

Proof Of Concept

PoC Available for CVE-2026-86350

CWE Category CWE-444

Published Date Sep 23, 2026

Modified Date Sep 23, 2026

Exploit Status Available

Score 9.1 CVSS v

Exploit Probability (EPSS)

0.31%

Vulnerability Summary

CVE-2026-86350: 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.

Impacted Vendors

Analysis in Progress...

Reference Links

https://lists.apache.org/thread/mss45z99lcdd5dtpgcn45dy82f3toswc

CVSS v3.1

Source Entity 134c704f-9b21-4f2e-91b3-4a467353bcc0

Severity CRITICAL

9.1

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-86350 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/abraxas/CVE-2026-86350

View Code

September 23, 2026 MODIFIED

Vulnerability data updated via NVD.

September 23, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


                                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected Stack

No specific products linked.