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Fencer Vulns
medium 6.5

CVE-2026-24733 json

Apache Tomcat: Security constraint bypass with HTTP/0.9

published 2026-02-17 8 mo ago modified 2026-09-11 59 d ago also BIT-tomcat-2026-24733 , EUVD-2026-7831 , GHSA-qq5r-98hh-rxc9

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 46%
public exploits
0
none known

Summary

Improper Input Validation vulnerability in Apache Tomcat.

Tomcat did not limit HTTP/0.9 requests to the GET method. If a security constraint was configured to allow HEAD requests to a URI but deny GET requests, the user could bypass that constraint on GET requests by sending a (specification invalid) HEAD request using HTTP/0.9.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.14, from 10.1.0-M1 through 10.1.49, from 9.0.0.M1 through 9.0.112.

Older, EOL versions are also affected.

Users are recommended to upgrade to version 11.0.15 or later, 10.1.50 or later or 9.0.113 or later, which fixes the issue.

Patch / fix

  • maven org.apache.tomcat:tomcat-coyote 9.0.113, 10.1.50, 11.0.15
  • bitnami tomcat 9.0.113, 10.1.50, 11.0.15
  • apache tomcat 9.0.113, 10.1.50, 11.0.15
  • org.apache.tomcat tomcat 9.0.113, 10.1.50, 11.0.15
  • apache tomcat-catalina 9.0.113, 10.1.50, 11.0.15
  • org.apache.tomcat tomcat-catalina 9.0.113, 10.1.50, 11.0.15
  • apache tomcat-embed-core 9.0.113, 10.1.50, 11.0.15
  • org.apache.tomcat.embed tomcat-embed-core 9.0.113, 10.1.50, 11.0.15
  • tomcat9 Debian 14, Debian 13, Debian 12 9.0.70-2
  • tomcat10 Debian 12 10.1.52-1~deb12u1
  • tomcat10 Debian 13 10.1.52-1~deb13u1
  • tomcat10 Debian 14 10.1.52-1
  • tomcat11 Debian 13 11.0.15-1~deb13u1
  • tomcat11 Debian 14 11.0.15-1

debian advisories DEBIAN-CVE-2026-24733

  • tomcat RHEL 8 1:9.0.120-1.el8_10
  • tomcat-lib RHEL 8 1:9.0.120-1.el8_10
  • tomcat-webapps RHEL 8 1:9.0.120-1.el8_10
  • tomcat-el-3.0-api RHEL 8 1:9.0.120-1.el8_10
  • tomcat-docs-webapp RHEL 8 1:9.0.120-1.el8_10
  • tomcat-jsp-2.3-api RHEL 8 1:9.0.120-1.el8_10
  • tomcat-admin-webapps RHEL 8 1:9.0.120-1.el8_10
  • tomcat-servlet-4.0-api RHEL 8 1:9.0.120-1.el8_10

red hat advisories RHSA-2026:68680RHSA-2026:68679RHSA-2026:68677RHSA-2026:68678RHSA-2026:68659RHSA-2026:67163

  • tomcat10 SLES for SAP applications 16.0, SLES 16.0 10.1.52-160000.1.1
  • tomcat11 SLES for SAP applications 16.0, SLES 16.0 11.0.18-160000.1.1
  • tomcat SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +9 more 9.0.115-150200.102.1
  • tomcat10 SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES 15 SP6-LTSS +5 more 10.1.52-150200.5.61.1
  • tomcat11 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Web and Scripting 15 SP7 +1 more 11.0.18-150600.13.15.1
  • tomcat SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 9.0.115-3.160.1
  • tomcat SLES LTSS Extended Security 12 SP5 9.0.36-3.156.1

suse advisories SUSE-SU-2026:20982-1SUSE-SU-2026:1058-1SUSE-SU-2026:20926-1SUSE-SU-2026:0932-1SUSE-SU-2026:0922-1SUSE-SU-2026:0890-1

  • tomcat10 openSUSE Leap 16.0 10.1.52-160000.1.1
  • tomcat11 openSUSE Leap 16.0 11.0.18-160000.1.1
  • tomcat openSUSE Leap 16.0 9.0.115-160000.1.1
  • tomcat openSUSE Tumbleweed 9.0.115-1.1
  • tomcat10 openSUSE Tumbleweed 10.1.52-1.1
  • tomcat11 openSUSE Tumbleweed 11.0.18-1.1

opensuse advisories openSUSE-SU-2026:20444-1openSUSE-SU-2026:20414-1openSUSE-SU-2026:20350-1openSUSE-SU-2026:10305-1openSUSE-SU-2026:10306-1openSUSE-SU-2026:10307-1

  • tomcat AlmaLinux 8 1:9.0.120-1.el8_10
  • tomcat-lib AlmaLinux 8 1:9.0.120-1.el8_10
  • tomcat-webapps AlmaLinux 8 1:9.0.120-1.el8_10
  • tomcat-el-3.0-api AlmaLinux 8 1:9.0.120-1.el8_10
  • tomcat-docs-webapp AlmaLinux 8 1:9.0.120-1.el8_10
  • tomcat-jsp-2.3-api AlmaLinux 8 1:9.0.120-1.el8_10
  • tomcat-admin-webapps AlmaLinux 8 1:9.0.120-1.el8_10
  • tomcat-servlet-4.0-api AlmaLinux 8 1:9.0.120-1.el8_10

almalinux advisories ALSA-2026:68677ALSA-2026:36790ALSA-2026:26323ALSA-2026:25341

  • tomcat9 Rocky Linux 10 1:9.0.117-1.el10_2

rocky linux advisories RLSA-2026:25341

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-2026-24733 updated cvss 3.7

tomcat: security constraint bypass with HTTP/0.9

  • 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 8 pki-servlet-engine, pki-servlet-4.0-api Red Hat Enterprise Linux 9 pki-servlet-engine, pki-servlet-4.0-api Red Hat Enterprise Linux 10 tomcat Red Hat JBoss Web Server 5 tomcat Red Hat JBoss Web Server 6 tomcat
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux AppStream (v. 8) tomcat 9.0.120-1.el8_10, tomcat-lib 9.0.120-1.el8_10, tomcat-webapps 9.0.120-1.el8_10, tomcat-el-3.0-api 9.0.120-1.el8_10, tomcat-docs-webapp 9.0.120-1.el8_10, tomcat-jsp-2.3-api 9.0.120-1.el8_10, +2 more
    fixed: vendor fix RHSA-2026:68677
  • Red Hat Enterprise Linux AppStream (v. 9) tomcat 9.0.117-1.el9_8, tomcat-lib 9.0.117-1.el9_8, tomcat-webapps 9.0.117-1.el9_8, tomcat-el-3.0-api 9.0.117-1.el9_8, tomcat-docs-webapp 9.0.117-1.el9_8, tomcat-jsp-2.3-api 9.0.117-1.el9_8, +2 more
    fixed: vendor fix RHSA-2026:26323
  • Red Hat Enterprise Linux AppStream (v. 10) tomcat9 9.0.117-1.el10_2, tomcat9-lib 9.0.117-1.el10_2, tomcat9-webapps 9.0.117-1.el10_2, tomcat9-el-3.0-api 9.0.117-1.el10_2, tomcat9-docs-webapp 9.0.117-1.el10_2, tomcat9-jsp-2.3-api 9.0.117-1.el10_2, +2 more
    fixed: vendor fix RHSA-2026:25341
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) tomcat 9.0.120-1.el8_8, tomcat-lib 9.0.120-1.el8_8, tomcat-webapps 9.0.120-1.el8_8, tomcat-el-3.0-api 9.0.120-1.el8_8, tomcat-docs-webapp 9.0.120-1.el8_8, tomcat-jsp-2.3-api 9.0.120-1.el8_8, +2 more
    fixed: vendor fix RHSA-2026:68680
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) tomcat 9.0.120-1.el9_2, tomcat-lib 9.0.120-1.el9_2, tomcat-webapps 9.0.120-1.el9_2, tomcat-el-3.0-api 9.0.120-1.el9_2, tomcat-docs-webapp 9.0.120-1.el9_2, tomcat-jsp-2.3-api 9.0.120-1.el9_2, +2 more
    fixed: vendor fix RHSA-2026:68678
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) tomcat 9.0.120-1.el9_4, tomcat-lib 9.0.120-1.el9_4, tomcat-webapps 9.0.120-1.el9_4, tomcat-el-3.0-api 9.0.120-1.el9_4, tomcat-docs-webapp 9.0.120-1.el9_4, tomcat-jsp-2.3-api 9.0.120-1.el9_4, +2 more
    fixed: vendor fix RHSA-2026:68679
show 6 more
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) tomcat9 9.0.120-1.el10_0, tomcat9-lib 9.0.120-1.el10_0, tomcat9-webapps 9.0.120-1.el10_0, tomcat9-el-3.0-api 9.0.120-1.el10_0, tomcat9-docs-webapp 9.0.120-1.el10_0, tomcat9-jsp-2.3-api 9.0.120-1.el10_0, +2 more
    fixed: vendor fix RHSA-2026:67163
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) tomcat 9.0.120-1.el9_6, tomcat-lib 9.0.120-1.el9_6, tomcat-webapps 9.0.120-1.el9_6, tomcat-el-3.0-api 9.0.120-1.el9_6, tomcat-docs-webapp 9.0.120-1.el9_6, tomcat-jsp-2.3-api 9.0.120-1.el9_6, +2 more
    fixed: vendor fix RHSA-2026:68659
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) tomcat 9.0.120-1.el8_8, tomcat-lib 9.0.120-1.el8_8, tomcat-webapps 9.0.120-1.el8_8, tomcat-el-3.0-api 9.0.120-1.el8_8, tomcat-docs-webapp 9.0.120-1.el8_8, tomcat-jsp-2.3-api 9.0.120-1.el8_8, +2 more
    fixed: vendor fix RHSA-2026:68680
  • Red Hat Hardened Images tomcat10 10.1.54-1.hum1, tomcat11 11.0.21-0.1.hum1, tomcat10-lib 10.1.54-1.hum1, tomcat11-lib 11.0.21-0.1.hum1, tomcat10-common 10.1.54-1.hum1, tomcat10-webapps 10.1.54-1.hum1, +12 more
    fixed: vendor fix RHSA-2026:8334
  • Red Hat JBoss Web Server 6.2 on RHEL 8 jws6-tomcat 10.1.49-10.redhat_00008.1.el8jws, jws6-tomcat-lib 10.1.49-10.redhat_00008.1.el8jws, jws6-tomcat-javadoc 10.1.49-10.redhat_00008.1.el8jws, jws6-tomcat-selinux 10.1.49-10.redhat_00008.1.el8jws, jws6-tomcat-webapps 10.1.49-10.redhat_00008.1.el8jws, jws6-tomcat-el-5.0-api 10.1.49-10.redhat_00008.1.el8jws, +4 more Red Hat JBoss Web Server 6.2 on RHEL 9 jws6-tomcat 10.1.49-10.redhat_00008.1.el9jws, jws6-tomcat-lib 10.1.49-10.redhat_00008.1.el9jws, jws6-tomcat-javadoc 10.1.49-10.redhat_00008.1.el9jws, jws6-tomcat-selinux 10.1.49-10.redhat_00008.1.el9jws, jws6-tomcat-webapps 10.1.49-10.redhat_00008.1.el9jws, jws6-tomcat-el-5.0-api 10.1.49-10.redhat_00008.1.el9jws, +4 more Red Hat JBoss Web Server 6.2 on RHEL 10 jws6-tomcat 10.1.49-10.redhat_00008.1.el10jws, jws6-tomcat-lib 10.1.49-10.redhat_00008.1.el10jws, jws6-tomcat-javadoc 10.1.49-10.redhat_00008.1.el10jws, jws6-tomcat-selinux 10.1.49-10.redhat_00008.1.el10jws, jws6-tomcat-webapps 10.1.49-10.redhat_00008.1.el10jws, jws6-tomcat-el-5.0-api 10.1.49-10.redhat_00008.1.el10jws, +4 more
    fixed: vendor fix RHSA-2026:12194
  • Red Hat JBoss Web Server 6.2.2
    fixed: vendor fix RHSA-2026:12195

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
no
Technical impact
partial
Assessed
8 mo ago

Exploit prediction

0.55% chance of exploitation in the next 30 days, higher than 46% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
NVD 3.1 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
OSV 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
maven org.apache.tomcat:tomcat-coyote
>=11.0.0-M1, <11.0.15
>=10.1.0-M1, <10.1.50
<9.0.113
11.0.15
10.1.50
9.0.113
bitnami tomcat
<9.0.113
>=10.0.0, <10.1.50
>=11.0.0, <11.0.15
9.0.113
10.1.50
11.0.15

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.