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TI-2026-26740 Aliases CVE-2026-34483GHSA-rv64-5gf8-9qq8

Apache Tomcat: Incomplete escaping of JSON access logs

Priority LOW 39CWE-116Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · None · None
Fix status
Partial Red Hat: 13 fixed, 6 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA, GitHub and Red Hat.

Summary

Improper Encoding or Escaping of Output vulnerability in the JsonAccessLogValve component of Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.20, from 10.1.0-M1 through 10.1.53, from 9.0.40 through 9.0.116. Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117 , which fix the issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00469 40th percentileScored 2026-11-07
Fix Partial org.apache.tomcat:tomcat-catalina (Maven): 9.0.116, 10.1.54, 11.0.21org.apache.tomcat:tomcat (Maven): 9.0.116, 10.1.54, 11.0.21+1 more productRed Hat: 10 advisoriesRed Hat: 13 fixed, 6 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ApacheApache Tomcat11.0.0-M1 – 11.0.20; 10.1.0-M1 – 10.1.53; 9.0.40 – 9.0.116; 8.5.84 – 8.5.100—Patch availableCNA
—org.apache.tomcat:tomcat-catalina (Maven)9.0.40 to before 9.0.1169.0.116Patch availableGHSA-rv64-5gf8-9qq8
—org.apache.tomcat:tomcat-catalina (Maven)10.1.0-M1 to before 10.1.5410.1.54Patch availableGHSA-rv64-5gf8-9qq8
—org.apache.tomcat:tomcat-catalina (Maven)11.0.0-M1 to before 11.0.2111.0.21Patch availableGHSA-rv64-5gf8-9qq8
—org.apache.tomcat:tomcat (Maven)9.0.40 to before 9.0.1169.0.116Patch availableGHSA-rv64-5gf8-9qq8
—org.apache.tomcat:tomcat (Maven)10.1.0-M1 to before 10.1.5410.1.54Patch availableGHSA-rv64-5gf8-9qq8
—org.apache.tomcat:tomcat (Maven)11.0.0-M1 to before 11.0.2111.0.21Patch availableGHSA-rv64-5gf8-9qq8
—org.apache.tomcat.embed:tomcat-embed-core (Maven)9.0.40 to before 9.0.1169.0.116Patch availableGHSA-rv64-5gf8-9qq8
—org.apache.tomcat.embed:tomcat-embed-core (Maven)10.1.0-M1 to before 10.1.5410.1.54Patch availableGHSA-rv64-5gf8-9qq8
—org.apache.tomcat.embed:tomcat-embed-core (Maven)11.0.0-M1 to before 11.0.2111.0.21Patch availableGHSA-rv64-5gf8-9qq8
  • Apache Tomcat VendorApache Affected 11.0.0-M1 – 11.0.20; 10.1.0-M1 – 10.1.53; 9.0.40 – 9.0.116; 8.5.84 – 8.5.100 Fixed in — Patch available CNA
  • org.apache.tomcat:tomcat-catalina (Maven) Vendor— Affected 9.0.40 to before 9.0.116 Fixed in 9.0.116 Patch available GHSA-rv64-5gf8-9qq8
  • org.apache.tomcat:tomcat-catalina (Maven) Vendor— Affected 10.1.0-M1 to before 10.1.54 Fixed in 10.1.54 Patch available GHSA-rv64-5gf8-9qq8
  • org.apache.tomcat:tomcat-catalina (Maven) Vendor— Affected 11.0.0-M1 to before 11.0.21 Fixed in 11.0.21 Patch available GHSA-rv64-5gf8-9qq8
  • org.apache.tomcat:tomcat (Maven) Vendor— Affected 9.0.40 to before 9.0.116 Fixed in 9.0.116 Patch available GHSA-rv64-5gf8-9qq8
  • org.apache.tomcat:tomcat (Maven) Vendor— Affected 10.1.0-M1 to before 10.1.54 Fixed in 10.1.54 Patch available GHSA-rv64-5gf8-9qq8
  • org.apache.tomcat:tomcat (Maven) Vendor— Affected 11.0.0-M1 to before 11.0.21 Fixed in 11.0.21 Patch available GHSA-rv64-5gf8-9qq8
  • org.apache.tomcat.embed:tomcat-embed-core (Maven) Vendor— Affected 9.0.40 to before 9.0.116 Fixed in 9.0.116 Patch available GHSA-rv64-5gf8-9qq8
  • org.apache.tomcat.embed:tomcat-embed-core (Maven) Vendor— Affected 10.1.0-M1 to before 10.1.54 Fixed in 10.1.54 Patch available GHSA-rv64-5gf8-9qq8
  • org.apache.tomcat.embed:tomcat-embed-core (Maven) Vendor— Affected 11.0.0-M1 to before 11.0.21 Fixed in 11.0.21 Patch available GHSA-rv64-5gf8-9qq8

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*9.0.40 to before 9.0.117; 10.1.0 to before 10.1.54; 11.0.0 to before 11.0.21VulnerableApache
  • cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* Versions 9.0.40 to before 9.0.117; 10.1.0 to before 10.1.54; 11.0.0 to before 11.0.21 Vulnerable ·Apache

Remediation

  • Fix · GHSA-rv64-5gf8-9qq8 org.apache.tomcat:tomcat-catalina (Maven) Fixed in 9.0.116 Advisory →
  • Fix · GHSA-rv64-5gf8-9qq8 org.apache.tomcat:tomcat-catalina (Maven) Fixed in 10.1.54 Advisory →
  • Fix · GHSA-rv64-5gf8-9qq8 org.apache.tomcat:tomcat-catalina (Maven) Fixed in 11.0.21 Advisory →
  • Fix · GHSA-rv64-5gf8-9qq8 org.apache.tomcat:tomcat (Maven) Fixed in 9.0.116 Advisory →
  • Fix · GHSA-rv64-5gf8-9qq8 org.apache.tomcat:tomcat (Maven) Fixed in 10.1.54 Advisory →
  • Fix · GHSA-rv64-5gf8-9qq8 org.apache.tomcat:tomcat (Maven) Fixed in 11.0.21 Advisory →
  • Fix · GHSA-rv64-5gf8-9qq8 org.apache.tomcat.embed:tomcat-embed-core (Maven) Fixed in 9.0.116 Advisory →
  • Fix · GHSA-rv64-5gf8-9qq8 org.apache.tomcat.embed:tomcat-embed-core (Maven) Fixed in 10.1.54 Advisory →
  • Fix · GHSA-rv64-5gf8-9qq8 org.apache.tomcat.embed:tomcat-embed-core (Maven) Fixed in 11.0.21 Advisory →

Red Hat 10 advisories

  • RHSA-2026:68677 Released 2026-09-17 · Red Hat rating Important
    tomcat security update
    • Red Hat Enterprise Linux AppStream (v. 8) tomcat-1:9.0.120-1.el8_10, tomcat-admin-webapps-1:9.0.120-1.el8_10, tomcat-docs-webapp-1:9.0.120-1.el8_10 +5
  • RHSA-2026:68659 Released 2026-09-17 · Red Hat rating Important
    tomcat security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) tomcat-1:9.0.120-1.el9_6, tomcat-admin-webapps-1:9.0.120-1.el9_6, tomcat-docs-webapp-1:9.0.120-1.el9_6 +5
  • RHSA-2026:68678 Released 2026-09-17 · Red Hat rating Important
    tomcat security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) tomcat-1:9.0.120-1.el9_2, tomcat-admin-webapps-1:9.0.120-1.el9_2, tomcat-docs-webapp-1:9.0.120-1.el9_2 +5
Show 7 more Red Hat advisories
  • RHSA-2026:68679 Released 2026-09-17 · Red Hat rating Important
    tomcat security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) tomcat-1:9.0.120-1.el9_4, tomcat-admin-webapps-1:9.0.120-1.el9_4, tomcat-docs-webapp-1:9.0.120-1.el9_4 +5
  • RHSA-2026:68680 Released 2026-09-17 · Red Hat rating Important
    tomcat security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) tomcat-1:9.0.120-1.el8_8, tomcat-admin-webapps-1:9.0.120-1.el8_8, tomcat-docs-webapp-1:9.0.120-1.el8_8 +5
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) tomcat-1:9.0.120-1.el8_8, tomcat-admin-webapps-1:9.0.120-1.el8_8, tomcat-docs-webapp-1:9.0.120-1.el8_8 +5
  • RHSA-2026:67163 Released 2026-09-14 · Red Hat rating Important
    tomcat9 security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) tomcat9-1:9.0.120-1.el10_0, tomcat9-admin-webapps-1:9.0.120-1.el10_0, tomcat9-docs-webapp-1:9.0.120-1.el10_0 +5
  • RHSA-2026:26323 Released 2026-06-16 · Red Hat rating Important
    tomcat security update
    • Red Hat Enterprise Linux AppStream (v. 9) tomcat-1:9.0.117-1.el9_8, tomcat-admin-webapps-1:9.0.117-1.el9_8, tomcat-docs-webapp-1:9.0.117-1.el9_8 +5
  • RHSA-2026:25341 Released 2026-06-11 · Red Hat rating Important
    tomcat9 security update
    • Red Hat Enterprise Linux AppStream (v. 10) tomcat9-1:9.0.117-1.el10_2, tomcat9-admin-webapps-1:9.0.117-1.el10_2, tomcat9-docs-webapp-1:9.0.117-1.el10_2 +5
  • RHSA-2026:20405 Released 2026-05-26 · Red Hat rating Important
    Red Hat JBoss Web Server 6.2.3 release and security update
    • Red Hat JBoss Web Server 6.2 on RHEL 10 jws6-tomcat-10.1.49-13.redhat_00011.1.el10jws, jws6-tomcat-admin-webapps-10.1.49-13.redhat_00011.1.el10jws, jws6-tomcat-docs-webapp-10.1.49-13.redhat_00011.1.el10jws +7
    • Red Hat JBoss Web Server 6.2 on RHEL 8 jws6-tomcat-10.1.49-13.redhat_00011.1.el8jws, jws6-tomcat-admin-webapps-10.1.49-13.redhat_00011.1.el8jws, jws6-tomcat-docs-webapp-10.1.49-13.redhat_00011.1.el8jws +7
    • Red Hat JBoss Web Server 6.2 on RHEL 9 jws6-tomcat-10.1.49-13.redhat_00011.1.el9jws, jws6-tomcat-admin-webapps-10.1.49-13.redhat_00011.1.el9jws, jws6-tomcat-docs-webapp-10.1.49-13.redhat_00011.1.el9jws +7
  • RHSA-2026:20406 Released 2026-05-26 · Red Hat rating Important
    Red Hat JBoss Web Server 6.2.3 release and security update
    • Red Hat JBoss Web Server 6.2.3

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred
Red Hat JBoss Web Server 5Affected—
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:25341
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:68677
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:26323
Red Hat Enterprise Linux AppStream E4S (v.8.8)Fixed RHSA-2026:68680
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:68678
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:68679
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:67163
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:68659
Red Hat Enterprise Linux AppStream TUS (v.8.8)Fixed RHSA-2026:68680
Red Hat JBoss Web Server 6.2 on RHEL 10Fixed RHSA-2026:20405
Red Hat JBoss Web Server 6.2 on RHEL 8Fixed RHSA-2026:20405
Red Hat JBoss Web Server 6.2 on RHEL 9Fixed RHSA-2026:20405
Red Hat JBoss Web Server 6.2.3Fixed RHSA-2026:20406

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-34483
  2. 2026-10-03 Alias added: GHSA-rv64-5gf8-9qq8
  3. 2026-10-09 Fix available: RHSA-2026:20406 · Red Hat
  4. 2026-11-06 Fix available: Red Hat JBoss Web Server 6.2.3 · Red Hat

References

Advisory 3

Other 1

  • TI-2025-18529 Apache Tomcat: Potential RCE and/or information disclosure and/or information corruption with partial PUT KEVCVSS 3.1CRITICAL 10.0
  • TI-2020-01862 Improper privilege management in Apache Tomcat KEVCVSS 3.1CRITICAL 9.8
  • TI-2016-07192 Improper access control in Apache Tomcat KEVCVSS 3.1CRITICAL 9.8
  • TI-2017-09342 Unrestricted file upload in Apache Tomcat KEVCVSS 3.1HIGH 8.1
  • TI-2017-09340 Unrestricted file upload in Apache Tomcat KEVCVSS 3.1HIGH 8.1
  • TI-2026-26741 Apache Tomcat: Fix for CVE-2026-29146 allowed bypass of EncryptInterceptor KEVCVSS 3.1HIGH 7.5
See all 273 →

Sources

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