CVE-2026-86350
📛 CVE Title
Apache Tomcat: Regression in fix for CVE-2026-41293 can trigger request header mix-up
Description
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.
Overview
- State
- PUBLISHED
- Assigner (CNA)
- apache
- CVSS severity
- —
- CVSS score
- —
- CVSS vector
- —
- Effective score
- 9.1 / 10 CRITICAL source: NVD
- CWE(s)
-
CWE-444 - Reserved
- 2026-09-07
- Published
- 2026-09-23 11:31 UTC
- Last updated
- 2026-09-23 16:17 UTC
- Source
- https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/86xxx/CVE-2026-86350.json
NVD triage scoring NVD CVE 2.0
Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.
- NVD published
- 2026-09-23 12:17:08 UTC
- NVD last modified
- 2026-09-23 17:58:26 UTC
- NVD CVSS v3.1
- 9.1 / 10 CRITICAL source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
- NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N- Exploitability subscore
- 3.9 / 10
- Impact subscore
- 5.2 / 10
NVD / KEV / EPSS data refreshed 2026-09-24 04:33 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.
European Union Vulnerability Database ENISA EUVD
ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.
- EUVD ID
-
EUVD-2026-85235 - Assigner
- apache
- Published
- Sep 23, 2026, 11:31:36 AM
- Updated
- Sep 23, 2026, 4:17:11 PM
- EUVD base score (CVSS 3.1)
-
9.1 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - EUVD-reported EPSS
- 0.0000
- Vendors
- Apache Software Foundation
- Products
-
Apache Tomcat (11.0.22 ≤11.0.25)Apache Tomcat (10.1.55 ≤10.1.59)Apache Tomcat (9.0.118 ≤9.0.121)
- Aliases
-
GHSA-6ff5-mwrj-376m
ENISA description: 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.
EUVD references (1)
Affected products (1)
| Vendor | Product | Versions | Platforms |
|---|---|---|---|
| Apache Software Foundation | Apache Tomcat |
11.0.22 (affected),
10.1.55 (affected),
9.0.118 (affected)
|
— |
Vendor references (1)
References embedded in the original CVE record by the assigning CNA.
- https://lists.apache.org/thread/mss45z99lcdd5dtpgcn45dy82f3toswc vendor-advisory
Web references (0)
DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.
No web references attached yet.
NVD-tagged references (1)
Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.
- https://lists.apache.org/thread/mss45z99lcdd5dtpgcn45dy82f3toswc security@apache.org
Remediations (10)
-
web:blogs.oracle.com
For more information about the Critical Patch Update program, see the security vulnerability remediation practices page located on the Oracle Trust Center.
2026-09-24 11:48 UTC -
web:sec.cloudapps.cisco.com
On September 16, 2026 , the Cisco Product Security Incident Response Team (PSIRT) published the advisories that are listed in the following tables. To remediate these vulnerabilities, Cisco strongly recommends that customers upgrade to the fixed software that is indicated in the advisories. For more information about changes in Cisco PSIRT vulnerability disclosure, see Strengthening the ...
2026-09-24 11:48 UTC -
web:securityonline.info
Patch Or Mitigation Steps Administrators must immediately apply the latest patches to safeguard their infrastructure. Upgrading to Tomcat 11.0.26 resolves all identified issues. For a complete list of technical fixes, review the official release notes detailing what was Fixed in Apache Tomcat 11.0.26.
2026-09-24 11:48 UTC -
web:senserva.com
Every Microsoft security patch (KB) and the CVEs it fixes, with severity, CVSS, and CISA KEV status. Cross-linked to the CVE reference.
2026-09-24 11:48 UTC -
web:vulners.com
Apache Tomcat is vulnerable to an HTTP Request/Response smuggling vulnerability caused by a regression in the fix for CVE - 2026 -41293 . This issue results in an inconsistent interpretation of HTTP/2 requests , which can trigger a request header mix...
2026-09-24 11:48 UTC -
web:www.aikido.dev
CVE remediation is fixing known flaws in the software you run. Why upgrading often fails, what remediation actually involves, and how backporting fixes it.
2026-09-24 11:48 UTC -
web:www.crowdstrike.com
Microsoft has released security updates for 622 vulnerabilities in its July 2026 Patch Tuesday rollout.
2026-09-24 11:48 UTC -
web:www.cvefind.com
Full details for CVE-2026-86350 : technical description, impact, CVSS/EPSS scores, linked CWE, CAPEC, affected CPEs, disclosure date, and mitigation options.
2026-09-24 11:48 UTC -
web:www.oracle.com
This Critical Patch Update contains 1448 new security patches across the product families listed below. Please note that a My Oracle Support (MOS) note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at July 2026 Critical Patch Update: Executive Summary and Analysis.
2026-09-24 11:48 UTC -
web:www.oracle.com
Additional CVEs addressed are: The patch for CVE - 2026 -34481 also addresses CVE - 2026 -34477, CVE - 2026 -34478, CVE - 2026 -34479, and CVE - 2026 -34480. Oracle Fusion Middleware Risk Matrix This Critical Security Patch Update contains 106 new security patches for Oracle Fusion Middleware. 53 of these vulnerabilities may be remotely exploitable without authentication, i.e., may be exploited over a ...
2026-09-24 11:48 UTC
AI Forensic Analysis
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Raw JSON
The full cvelistV5 record. Download as CVE-2026-86350.json.
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