Skip to content
Fencer Vulns
critical 9.8

CVE-2026-65637 json

Apache Tomcat: HTTP/2 no-authority bypass of strict SNI validation - CVE-2026-32990 fix incomplete

published 2026-08-25 2 mo ago modified 2026-10-27 12 d ago also BIT-tomcat-2026-65637 , EUVD-2026-66127 , GHSA-f525-44xv-f2qj

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 55%
public exploits
0
none known

Summary

Improper Input Validation vulnerability in Apache Tomcat due to incomplete fix for CVE-2026-32990.

This issue affects Apache Tomcat: from 11.0.20 through 11.0.24, from 10.1.53 through 10.1.57, from 9.0.115 through 9.0.120.

Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, which fix the issue.

Patch / fix

  • maven org.apache.tomcat:tomcat-coyote 9.0.121, 10.1.59, 11.0.25
  • maven org.apache.tomcat.embed:tomcat-embed-core 9.0.121, 10.1.59, 11.0.25
  • bitnami tomcat 9.0.121, 10.1.58, 11.0.25
  • apache tomcat 9.0.121, 10.1.58, 11.0.25
  • org.apache.tomcat tomcat 9.0.121, 10.1.58, 11.0.25
  • apache tomcat-catalina 9.0.121, 10.1.58, 11.0.25
  • org.apache.tomcat tomcat-catalina 9.0.121, 10.1.58, 11.0.25
  • apache tomcat-embed-core 9.0.121, 10.1.58, 11.0.25
  • org.apache.tomcat.embed tomcat-embed-core 9.0.121, 10.1.58, 11.0.25
  • tomcat9 Debian 14, Debian 13, Debian 12 9.0.70-2
  • tomcat10 Debian 14 10.1.60-1

debian advisories DEBIAN-CVE-2026-65637

  • jws7-tomcat jboss enterprise web server 7.0 11.0.21-7.redhat_00006.1.el10jws
  • jws7-tomcat jboss enterprise web server 7.0 11.0.21-7.redhat_00006.1.el8jws
  • jws7-tomcat jboss enterprise web server 7.0 11.0.21-7.redhat_00006.1.el9jws
  • jws7-tomcat-lib jboss enterprise web server 7.0 11.0.21-7.redhat_00006.1.el10jws
  • jws7-tomcat-lib jboss enterprise web server 7.0 11.0.21-7.redhat_00006.1.el8jws
  • jws7-tomcat-lib jboss enterprise web server 7.0 11.0.21-7.redhat_00006.1.el9jws
  • jws7-tomcat-javadoc jboss enterprise web server 7.0 11.0.21-7.redhat_00006.1.el10jws
  • jws7-tomcat-javadoc jboss enterprise web server 7.0 11.0.21-7.redhat_00006.1.el8jws

red hat advisories RHSA-2026:76952RHSA-2026:63137RHSA-2026:56039

  • tomcat SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 9.0.121-150200.120.1
  • tomcat10 SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES 15 SP6-LTSS +4 more 10.1.59-150200.5.79.1
  • tomcat11 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Web and Scripting 15 SP7 11.0.25-150600.13.33.2
  • tomcat SLES 16.0, SLES for SAP applications 16.0 9.0.121-160000.1.1
  • tomcat11 SLES 16.0, SLES for SAP applications 16.0 11.0.25-160000.1.1
  • tomcat10 SLES 16.0, SLES for SAP applications 16.0 10.1.59-160000.1.1
  • tomcat SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 9.0.121-3.177.3

suse advisories SUSE-SU-2026:4203-1SUSE-SU-2026:4126-1SUSE-SU-2026:4119-1SUSE-SU-2026:4114-1SUSE-SU-2026:23700-1SUSE-SU-2026:23720-1

  • tomcat openSUSE Tumbleweed 9.0.121-1.1
  • tomcat10 openSUSE Tumbleweed 10.1.59-1.1
  • tomcat11 openSUSE Tumbleweed 11.0.25-1.1
  • tomcat openSUSE Leap 16.0 9.0.121-160000.1.1
  • tomcat10 openSUSE Leap 16.0 10.1.59-160000.1.1
  • tomcat11 openSUSE Leap 16.0 11.0.25-160000.1.1

opensuse advisories openSUSE-SU-2026:11759-1openSUSE-SU-2026:11760-1openSUSE-SU-2026:11761-1openSUSE-SU-2026:21823-1openSUSE-SU-2026:21810-1openSUSE-SU-2026:21811-1

  • tomcat AlmaLinux 9 1:9.0.121-1.el9_8
  • tomcat-lib AlmaLinux 9 1:9.0.121-1.el9_8
  • tomcat-webapps AlmaLinux 9 1:9.0.121-1.el9_8
  • tomcat-el-3.0-api AlmaLinux 9 1:9.0.121-1.el9_8
  • tomcat-docs-webapp AlmaLinux 9 1:9.0.121-1.el9_8
  • tomcat-jsp-2.3-api AlmaLinux 9 1:9.0.121-1.el9_8
  • tomcat-admin-webapps AlmaLinux 9 1:9.0.121-1.el9_8
  • tomcat-servlet-4.0-api AlmaLinux 9 1:9.0.121-1.el9_8

almalinux advisories ALSA-2026:93469ALSA-2026:92869

  • tomcat Rocky Linux 9 1:9.0.121-1.el9_8
  • tomcat Rocky Linux 8 1:9.0.121-1.el8_10

rocky linux advisories RLSA-2026:93469RLSA-2026:92869

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-65637 updated cvss 6.5

tomcat: Apache Tomcat: Improper Input Validation allows HTTP/2 no-authority bypass of strict SNI validation

  • Red Hat Enterprise Linux 6 tomcat6, tomcat6-lib, tomcat6-log4j, tomcat6-javadoc, tomcat6-webapps, tomcat6-el-2.1-api, +4 more Red Hat Enterprise Linux 7 tomcat, tomcat-lib, tomcat-jsvc, tomcat-javadoc, tomcat-webapps, tomcat-el-2.2-api, +4 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 10 tomcat, tomcat9
    affected: workaround, no fix available
  • Red Hat JBoss Web Server 5 tomcat
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) tomcat 9.0.121-1.el8_10, tomcat-lib 9.0.121-1.el8_10, tomcat-webapps 9.0.121-1.el8_10, tomcat-el-3.0-api 9.0.121-1.el8_10, tomcat-docs-webapp 9.0.121-1.el8_10, tomcat-jsp-2.3-api 9.0.121-1.el8_10, +2 more
    fixed: vendor fix RHSA-2026:92869
  • Red Hat Enterprise Linux AppStream (v. 9) tomcat 9.0.121-1.el9_8, tomcat-lib 9.0.121-1.el9_8, tomcat-webapps 9.0.121-1.el9_8, tomcat-el-3.0-api 9.0.121-1.el9_8, tomcat-docs-webapp 9.0.121-1.el9_8, tomcat-jsp-2.3-api 9.0.121-1.el9_8, +2 more
    fixed: vendor fix RHSA-2026:93469
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) tomcat 9.0.121-1.el9_2, tomcat-lib 9.0.121-1.el9_2, tomcat-webapps 9.0.121-1.el9_2, tomcat-el-3.0-api 9.0.121-1.el9_2, tomcat-docs-webapp 9.0.121-1.el9_2, tomcat-jsp-2.3-api 9.0.121-1.el9_2, +2 more
    fixed: vendor fix RHSA-2026:92871
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) tomcat 9.0.121-1.el9_4, tomcat-lib 9.0.121-1.el9_4, tomcat-webapps 9.0.121-1.el9_4, tomcat-el-3.0-api 9.0.121-1.el9_4, tomcat-docs-webapp 9.0.121-1.el9_4, tomcat-jsp-2.3-api 9.0.121-1.el9_4, +2 more
    fixed: vendor fix RHSA-2026:92872
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) tomcat 9.0.121-1.el9_6, tomcat-lib 9.0.121-1.el9_6, tomcat-webapps 9.0.121-1.el9_6, tomcat-el-3.0-api 9.0.121-1.el9_6, tomcat-docs-webapp 9.0.121-1.el9_6, tomcat-jsp-2.3-api 9.0.121-1.el9_6, +2 more
    fixed: vendor fix RHSA-2026:92870
show 4 more
  • Red Hat Hardened Images tomcat10 10.1.59-0.1.hum1, tomcat11 11.0.25-0.1.hum1, tomcat10-lib 10.1.59-0.1.hum1, tomcat11-lib 11.0.25-0.1.hum1, tomcat10-common 10.1.59-0.1.hum1, tomcat11-common 11.0.25-0.1.hum1, +14 more
    fixed: vendor fix RHSA-2026:63137
  • Red Hat JBoss Web Server 7.0 on RHEL 8 jws7-tomcat 11.0.21-7.redhat_00006.1.el8jws, jws7-tomcat-lib 11.0.21-7.redhat_00006.1.el8jws, jws7-tomcat-javadoc 11.0.21-7.redhat_00006.1.el8jws, jws7-tomcat-selinux 11.0.21-7.redhat_00006.1.el8jws, jws7-tomcat-webapps 11.0.21-7.redhat_00006.1.el8jws, jws7-tomcat-el-5.0-api 11.0.21-7.redhat_00006.1.el8jws, +4 more Red Hat JBoss Web Server 7.0 on RHEL 9 jws7-tomcat 11.0.21-7.redhat_00006.1.el9jws, jws7-tomcat-lib 11.0.21-7.redhat_00006.1.el9jws, jws7-tomcat-javadoc 11.0.21-7.redhat_00006.1.el9jws, jws7-tomcat-selinux 11.0.21-7.redhat_00006.1.el9jws, jws7-tomcat-webapps 11.0.21-7.redhat_00006.1.el9jws, jws7-tomcat-el-5.0-api 11.0.21-7.redhat_00006.1.el9jws, +4 more Red Hat JBoss Web Server 7.0 on RHEL 10 jws7-tomcat 11.0.21-7.redhat_00006.1.el10jws, jws7-tomcat-lib 11.0.21-7.redhat_00006.1.el10jws, jws7-tomcat-javadoc 11.0.21-7.redhat_00006.1.el10jws, jws7-tomcat-selinux 11.0.21-7.redhat_00006.1.el10jws, jws7-tomcat-webapps 11.0.21-7.redhat_00006.1.el10jws, jws7-tomcat-el-5.0-api 11.0.21-7.redhat_00006.1.el10jws, +4 more
    fixed: vendor fix RHSA-2026:76952
  • Red Hat JBoss Web Server 7.0.2
    fixed: vendor fix RHSA-2026:76956
  • Red Hat Enterprise Linux 8 pki-servlet-engine, pki-servlet-4.0-api Red Hat Enterprise Linux 9 pki-servlet-engine, pki-servlet-4.0-api Red Hat JBoss Web Server 6 tomcat
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
2 mo ago

Exploit prediction

0.75% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
OSV 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
maven org.apache.tomcat:tomcat-coyote
>=11.0.20, <11.0.25
>=10.1.53, <10.1.59
>=9.0.115, <9.0.121
11.0.25
10.1.59
9.0.121
maven org.apache.tomcat.embed:tomcat-embed-core
>=11.0.20, <11.0.25
>=10.1.53, <10.1.59
>=9.0.115, <9.0.121
11.0.25
10.1.59
9.0.121
bitnami tomcat
>=9.0.115, <9.0.121
>=10.1.53, <10.1.58
>=11.0.20, <11.0.25
9.0.121
10.1.58
11.0.25

Affected products

  • Apache Software Foundation Apache Tomcat

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.