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Fencer Vulns
critical 9.1

CVE-2026-59083 json

Apache Tomcat: Incorrect URL decoding in RewriteValve may allow security control bypass

published 2026-07-14 3 mo ago modified 2026-09-08 2 mo ago also BIT-tomcat-2026-59083 , EUVD-2026-43638

cvss
9.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 44%
public exploits
0
none known

Summary

Improper Handling of URL Encoding (Hex Encoding) vulnerability in Apache Tomcat's rewrite valve allowed security constraint bypass for some configurations.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.23, from 10.1.0-M1 through 10.1.56, from 9.0.0.M1 through 9.0.119, from 8.5.0 through 8.5.100. Other versions that have reached end of support may also be affected.

Users are recommended to upgrade to version 11.0.24, 10.1.57 or 9.0.120, which fix the issue.

Patch / fix

  • bitnami tomcat 9.0.120, 10.1.57, 11.0.24
  • tomcat9 Debian 14, Debian 13, Debian 12 9.0.70-2
  • tomcat10 Debian 14 10.1.60-1
  • tomcat11 Debian 14 11.0.24-1

debian advisories DEBIAN-CVE-2026-59083

  • jws6-tomcat jboss enterprise web server 6.2 10.1.49-16.redhat_00016.1.el10jws
  • jws6-tomcat jboss enterprise web server 6.2 10.1.49-16.redhat_00016.1.el8jws
  • jws6-tomcat jboss enterprise web server 6.2 10.1.49-16.redhat_00016.1.el9jws
  • jws6-tomcat-lib jboss enterprise web server 6.2 10.1.49-16.redhat_00016.1.el10jws
  • jws6-tomcat-lib jboss enterprise web server 6.2 10.1.49-16.redhat_00016.1.el8jws
  • jws6-tomcat-lib jboss enterprise web server 6.2 10.1.49-16.redhat_00016.1.el9jws
  • jws6-tomcat-javadoc jboss enterprise web server 6.2 10.1.49-16.redhat_00016.1.el10jws
  • jws6-tomcat-javadoc jboss enterprise web server 6.2 10.1.49-16.redhat_00016.1.el8jws

red hat advisories RHSA-2026:73981RHSA-2026:68651RHSA-2026:68680RHSA-2026:68679RHSA-2026:68677RHSA-2026:68678

  • tomcat11 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Web and Scripting 15 SP7 11.0.24-150600.13.27.1
  • tomcat SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 9.0.120-150200.114.1
  • tomcat10 SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES 15 SP6-LTSS +4 more 10.1.57-150200.5.73.1
  • tomcat SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 9.0.120-3.174.1

suse advisories SUSE-SU-2026:3440-1SUSE-SU-2026:3430-1SUSE-SU-2026:3419-1SUSE-SU-2026:3418-1

  • tomcat11 openSUSE Leap 16.0 11.0.24-160000.1.1
  • tomcat10 openSUSE Leap 16.0 10.1.57-160000.1.1
  • tomcat openSUSE Leap 16.0 9.0.120-160000.1.1
  • tomcat openSUSE Tumbleweed 9.0.120-1.1
  • tomcat10 openSUSE Tumbleweed 10.1.57-1.1
  • tomcat11 openSUSE Tumbleweed 11.0.24-1.1

opensuse advisories openSUSE-SU-2026:21490-1openSUSE-SU-2026:21487-1openSUSE-SU-2026:21486-1openSUSE-SU-2026:11399-1openSUSE-SU-2026:11400-1openSUSE-SU-2026:11401-1

  • tomcat9 AlmaLinux 10 1:9.0.120-1.el10_2.alma.1
  • tomcat9-lib AlmaLinux 10 1:9.0.120-1.el10_2.alma.1
  • tomcat9-webapps AlmaLinux 10 1:9.0.120-1.el10_2.alma.1
  • tomcat9-el-3.0-api AlmaLinux 10 1:9.0.120-1.el10_2.alma.1
  • tomcat9-docs-webapp AlmaLinux 10 1:9.0.120-1.el10_2.alma.1
  • tomcat9-jsp-2.3-api AlmaLinux 10 1:9.0.120-1.el10_2.alma.1
  • tomcat9-admin-webapps AlmaLinux 10 1:9.0.120-1.el10_2.alma.1
  • tomcat9-servlet-4.0-api AlmaLinux 10 1:9.0.120-1.el10_2.alma.1

almalinux advisories ALSA-2026:68651ALSA-2026:68660ALSA-2026:68677

  • tomcat9 Rocky Linux 10 1:9.0.120-1.el10_2
  • tomcat Rocky Linux 9 1:9.0.120-2.el9_8
  • tomcat Rocky Linux 8 1:9.0.120-1.el8_10

rocky linux advisories RLSA-2026:68651RLSA-2026:68660RLSA-2026:68677

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-2026-59083 updated cvss 3.7

tomcat: Apache Tomcat: Security constraint bypass via improper URL encoding in rewrite valve

  • 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 Red Hat JBoss Web Server 5 jws5-tomcat, jws5-tomcat-lib, jws5-tomcat-jsvc, jws5-tomcat-javadoc, jws5-tomcat-selinux, jws5-tomcat-webapps, +7 more
    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 9.0.120-2.el9_8, tomcat-lib 9.0.120-2.el9_8, tomcat-webapps 9.0.120-2.el9_8, tomcat-el-3.0-api 9.0.120-2.el9_8, tomcat-docs-webapp 9.0.120-2.el9_8, tomcat-jsp-2.3-api 9.0.120-2.el9_8, +2 more
    fixed: vendor fix RHSA-2026:68660
  • Red Hat Enterprise Linux AppStream (v. 10) tomcat9 9.0.120-1.el10_2, tomcat9-lib 9.0.120-1.el10_2, tomcat9-webapps 9.0.120-1.el10_2, tomcat9-el-3.0-api 9.0.120-1.el10_2, tomcat9-docs-webapp 9.0.120-1.el10_2, tomcat9-jsp-2.3-api 9.0.120-1.el10_2, +2 more
    fixed: vendor fix RHSA-2026:68651
  • 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 9 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 10.1.57-1.hum1, tomcat11 11.0.24-0.1.hum1, tomcat10-lib 10.1.57-1.hum1, tomcat11-lib 11.0.24-0.1.hum1, tomcat10-common 10.1.57-1.hum1, tomcat10-webapps 10.1.57-1.hum1, +14 more
    fixed: vendor fix RHSA-2026:37767
  • Red Hat JBoss Web Server 6.2 on RHEL 8 jws6-tomcat 10.1.49-16.redhat_00016.1.el8jws, jws6-tomcat-lib 10.1.49-16.redhat_00016.1.el8jws, jws6-tomcat-javadoc 10.1.49-16.redhat_00016.1.el8jws, jws6-tomcat-selinux 10.1.49-16.redhat_00016.1.el8jws, jws6-tomcat-webapps 10.1.49-16.redhat_00016.1.el8jws, jws6-tomcat-el-5.0-api 10.1.49-16.redhat_00016.1.el8jws, +4 more Red Hat JBoss Web Server 6.2 on RHEL 9 jws6-tomcat 10.1.49-16.redhat_00016.1.el9jws, jws6-tomcat-lib 10.1.49-16.redhat_00016.1.el9jws, jws6-tomcat-javadoc 10.1.49-16.redhat_00016.1.el9jws, jws6-tomcat-selinux 10.1.49-16.redhat_00016.1.el9jws, jws6-tomcat-webapps 10.1.49-16.redhat_00016.1.el9jws, jws6-tomcat-el-5.0-api 10.1.49-16.redhat_00016.1.el9jws, +4 more Red Hat JBoss Web Server 6.2 on RHEL 10 jws6-tomcat 10.1.49-16.redhat_00016.1.el10jws, jws6-tomcat-lib 10.1.49-16.redhat_00016.1.el10jws, jws6-tomcat-javadoc 10.1.49-16.redhat_00016.1.el10jws, jws6-tomcat-selinux 10.1.49-16.redhat_00016.1.el10jws, jws6-tomcat-webapps 10.1.49-16.redhat_00016.1.el10jws, jws6-tomcat-el-5.0-api 10.1.49-16.redhat_00016.1.el10jws, +4 more
    fixed: vendor fix RHSA-2026:73981
  • Red Hat JBoss Web Server 6.2.5
    fixed: vendor fix RHSA-2026:73982
  • Red Hat JBoss Web Server 7.0 on RHEL 8 jws7-tomcat 11.0.21-6.redhat_00005.1.el8jws, jws7-tomcat-lib 11.0.21-6.redhat_00005.1.el8jws, jws7-tomcat-javadoc 11.0.21-6.redhat_00005.1.el8jws, jws7-tomcat-selinux 11.0.21-6.redhat_00005.1.el8jws, jws7-tomcat-webapps 11.0.21-6.redhat_00005.1.el8jws, jws7-tomcat-el-5.0-api 11.0.21-6.redhat_00005.1.el8jws, +4 more Red Hat JBoss Web Server 7.0 on RHEL 9 jws7-tomcat 11.0.21-6.redhat_00005.1.el9jws, jws7-tomcat-lib 11.0.21-6.redhat_00005.1.el9jws, jws7-tomcat-javadoc 11.0.21-6.redhat_00005.1.el9jws, jws7-tomcat-selinux 11.0.21-6.redhat_00005.1.el9jws, jws7-tomcat-webapps 11.0.21-6.redhat_00005.1.el9jws, jws7-tomcat-el-5.0-api 11.0.21-6.redhat_00005.1.el9jws, +4 more Red Hat JBoss Web Server 7.0 on RHEL 10 jws7-tomcat 11.0.21-6.redhat_00005.1.el10jws, jws7-tomcat-lib 11.0.21-6.redhat_00005.1.el10jws, jws7-tomcat-javadoc 11.0.21-6.redhat_00005.1.el10jws, jws7-tomcat-selinux 11.0.21-6.redhat_00005.1.el10jws, jws7-tomcat-webapps 11.0.21-6.redhat_00005.1.el10jws, jws7-tomcat-el-5.0-api 11.0.21-6.redhat_00005.1.el10jws, +4 more
    fixed: vendor fix RHSA-2026:49951
  • Red Hat JBoss Web Server 7.0.1
    fixed: vendor fix RHSA-2026:49952
  • 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
    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
3 mo ago

Exploit prediction

0.52% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CNA 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
OSV 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
bitnami tomcat
<9.0.120
>=10.1.0, <10.1.57
>=11.0.0, <11.0.24
9.0.120
10.1.57
11.0.24

Affected products

  • Apache Software Foundation Apache Tomcat

Classification

Weakness
  • CWE-177 Improper Handling of URL Encoding (Hex Encoding)

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.