Vulnerability · Published Sep 23, 2026 · Assigned by apache
CVE-2026-86248Apache Tomcat: Fix for CVE-2026-34500 was incomplete. OCSP checks sometimes soft-fail with FFM even when soft-fail is disabled
Critical 9.8
In plain English
A critical-severity improper authentication in Apache Tomcat from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
CLIENT_CERT authentication does not fail as expected for some scenarios when soft fail is disabled vulnerability in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M14 through 11.0.25, from 10.1.22 through 10.1.59, from 9.0.92 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | tomcat10 | no fix listed | DEBIAN-CVE-2026-86248 |
| Debian:13 | tomcat10 | no fix listed | DEBIAN-CVE-2026-86248 |
| Debian:14 | tomcat10 | 10.1.60-1 | DEBIAN-CVE-2026-86248 |
| Debian:13 | tomcat11 | no fix listed | DEBIAN-CVE-2026-86248 |
| Debian:14 | tomcat11 | no fix listed | DEBIAN-CVE-2026-86248 |
| Debian:12 | tomcat9 | 9.0.70-2 | DEBIAN-CVE-2026-86248 |
| Debian:13 | tomcat9 | 9.0.70-2 | DEBIAN-CVE-2026-86248 |
| Debian:14 | tomcat9 | 9.0.70-2 | DEBIAN-CVE-2026-86248 |
| Ubuntu:24.04:LTS | tomcat10 | no fix listed | UBUNTU-CVE-2026-86248 |
| Ubuntu:26.04:LTS | tomcat10 | no fix listed | UBUNTU-CVE-2026-86248 |
| Ubuntu:26.10 | tomcat10 | no fix listed | UBUNTU-CVE-2026-86248 |
| Ubuntu:26.04:LTS | tomcat11 | no fix listed | UBUNTU-CVE-2026-86248 |
| Ubuntu:26.10 | tomcat11 | no fix listed | UBUNTU-CVE-2026-86248 |
| Ubuntu:24.04:LTS | tomcat9 | no fix listed | UBUNTU-CVE-2026-86248 |
| Ubuntu:26.04:LTS | tomcat9 | no fix listed | UBUNTU-CVE-2026-86248 |
| Ubuntu:26.10 | tomcat9 | no fix listed | UBUNTU-CVE-2026-86248 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache Tomcat | 11.0.0-M14 – through 11.0.2510.1.22 – through 10.1.599.0.92 – through 9.0.121 |
Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://lists.apache.org/thread/nmkmjp9l53y8h3oc4n8fc0bkw9dv15sk vendor-advisory