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TI-2026-48346 Aliases CVE-2026-68763GHSA-82jr-6mfr-9vq5

Apache Tomcat: DoS via allocation leak in HTTP/2 backlog tracking when a stream is reset

Priority MEDIUM 40CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 14 fixed, 6 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-400.

Summary

Uncontrolled Resource Consumption vulnerability in Apache Tomcat via an allocation leak in the HTTP/2 backlog tracking when a stream is reset This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.39 through 9.0.120. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.59 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, which fix the issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00745 55th percentileScored 2026-11-07
Fix Partial Red Hat: 11 advisoriesRed Hat: 14 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 – 11.0.24; 10.1.0-M1 – 10.1.57; 9.0.39 – 9.0.120; 8.5.59 – 8.5.100—Patch availableCNA
  • Apache Tomcat VendorApache Affected 11.0.0-M1 – 11.0.24; 10.1.0-M1 – 10.1.57; 9.0.39 – 9.0.120; 8.5.59 – 8.5.100 Fixed in — Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*8.5.59 to before 9.0.121; 10.1.0 to before 10.1.58; 11.0.0 to before 11.0.25VulnerableApache
  • cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* Versions 8.5.59 to before 9.0.121; 10.1.0 to before 10.1.58; 11.0.0 to before 11.0.25 Vulnerable ·Apache

Remediation

Red Hat 11 advisories

  • RHSA-2026:93469 Released 2026-11-02 · Red Hat rating Important
    tomcat security update
    • Red Hat Enterprise Linux AppStream (v. 9) tomcat-1:9.0.121-1.el9_8, tomcat-admin-webapps-1:9.0.121-1.el9_8, tomcat-docs-webapp-1:9.0.121-1.el9_8 +5
  • RHSA-2026:92872 Released 2026-10-29 · Red Hat rating Important
    tomcat security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) tomcat-1:9.0.121-1.el9_4, tomcat-admin-webapps-1:9.0.121-1.el9_4, tomcat-docs-webapp-1:9.0.121-1.el9_4 +5
  • RHSA-2026:92871 Released 2026-10-29 · Red Hat rating Important
    tomcat security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) tomcat-1:9.0.121-1.el9_2, tomcat-admin-webapps-1:9.0.121-1.el9_2, tomcat-docs-webapp-1:9.0.121-1.el9_2 +5
Show 8 more Red Hat advisories
  • RHSA-2026:92870 Released 2026-10-29 · Red Hat rating Important
    tomcat security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) tomcat-1:9.0.121-1.el9_6, tomcat-admin-webapps-1:9.0.121-1.el9_6, tomcat-docs-webapp-1:9.0.121-1.el9_6 +5
  • RHSA-2026:92863 Released 2026-10-29 · Red Hat rating Important
    tomcat security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) tomcat-1:10.1.49-2.el10_0, tomcat-admin-webapps-1:10.1.49-2.el10_0, tomcat-docs-webapp-1:10.1.49-2.el10_0 +5
  • RHSA-2026:76952 Released 2026-10-07 · Red Hat rating Important
    Red Hat JBoss Web Server 7.0.2 release and security update
    • Red Hat JBoss Web Server 7.0 on RHEL 10 jws7-tomcat-11.0.21-7.redhat_00006.1.el10jws, jws7-tomcat-admin-webapps-11.0.21-7.redhat_00006.1.el10jws, jws7-tomcat-docs-webapp-11.0.21-7.redhat_00006.1.el10jws +7
    • Red Hat JBoss Web Server 7.0 on RHEL 8 jws7-tomcat-11.0.21-7.redhat_00006.1.el8jws, jws7-tomcat-admin-webapps-11.0.21-7.redhat_00006.1.el8jws, jws7-tomcat-docs-webapp-11.0.21-7.redhat_00006.1.el8jws +7
    • Red Hat JBoss Web Server 7.0 on RHEL 9 jws7-tomcat-11.0.21-7.redhat_00006.1.el9jws, jws7-tomcat-admin-webapps-11.0.21-7.redhat_00006.1.el9jws, jws7-tomcat-docs-webapp-11.0.21-7.redhat_00006.1.el9jws +7
  • RHSA-2026:76956 Released 2026-10-07 · Red Hat rating Important
    Red Hat JBoss Web Server 7.0.2 release and security update
    • Red Hat JBoss Web Server 7.0.2
  • RHSA-2026:73981 Released 2026-10-01 · Red Hat rating Important
    Red Hat JBoss Web Server 6.2.5 release and security update
    • Red Hat JBoss Web Server 6.2 on RHEL 10 jws6-tomcat-10.1.49-16.redhat_00016.1.el10jws, jws6-tomcat-admin-webapps-10.1.49-16.redhat_00016.1.el10jws, jws6-tomcat-docs-webapp-10.1.49-16.redhat_00016.1.el10jws +7
    • Red Hat JBoss Web Server 6.2 on RHEL 8 jws6-tomcat-10.1.49-16.redhat_00016.1.el8jws, jws6-tomcat-admin-webapps-10.1.49-16.redhat_00016.1.el8jws, jws6-tomcat-docs-webapp-10.1.49-16.redhat_00016.1.el8jws +7
    • Red Hat JBoss Web Server 6.2 on RHEL 9 jws6-tomcat-10.1.49-16.redhat_00016.1.el9jws, jws6-tomcat-admin-webapps-10.1.49-16.redhat_00016.1.el9jws, jws6-tomcat-docs-webapp-10.1.49-16.redhat_00016.1.el9jws +7
  • RHSA-2026:73982 Released 2026-10-01 · Red Hat rating Important
    Red Hat JBoss Web Server 6.2.5 release and security update
    • Red Hat JBoss Web Server 6.2.5
  • RHSA-2026:63137 Released 2026-09-03 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images tomcat10-1:10.1.59-0.1.hum1@noarch@public-hummingbird-aarch64-rpms, tomcat10-1:10.1.59-0.1.hum1@noarch@public-hummingbird-x86_64-rpms, tomcat10-1:10.1.59-0.1.hum1@src +18
  • RHSA-2026:56039 Released 2026-08-18 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images tomcat11-1:11.0.25-0.1.hum1@noarch@public-hummingbird-aarch64-rpms, tomcat11-1:11.0.25-0.1.hum1@noarch@public-hummingbird-x86_64-rpms, tomcat11-1:11.0.25-0.1.hum1@src +18

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 8AffectedNo fix yet
Red Hat Enterprise Linux 9AffectedNo fix planned: Will not fix
Red Hat JBoss Web Server 5AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:93469
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:92871
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:92872
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:92863
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:92870
Red Hat Hardened ImagesFixed RHSA-2026:56039, RHSA-2026:63137
Red Hat JBoss Web Server 6.2 on RHEL 10Fixed RHSA-2026:73981
Red Hat JBoss Web Server 6.2 on RHEL 8Fixed RHSA-2026:73981
Red Hat JBoss Web Server 6.2 on RHEL 9Fixed RHSA-2026:73981
Red Hat JBoss Web Server 6.2.5Fixed RHSA-2026:73982
Red Hat JBoss Web Server 7.0 on RHEL 10Fixed RHSA-2026:76952
Red Hat JBoss Web Server 7.0 on RHEL 8Fixed RHSA-2026:76952
Red Hat JBoss Web Server 7.0 on RHEL 9Fixed RHSA-2026:76952
Red Hat JBoss Web Server 7.0.2Fixed RHSA-2026:76956
Not affected: 1 product
  • Red Hat Enterprise Linux 8

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-68763
  2. 2026-10-03 Alias added: GHSA-82jr-6mfr-9vq5
  3. 2026-10-07 Fix available: RHSA-2026:76952 · Red Hat
  4. 2026-10-07 Fix available: Red Hat JBoss Web Server 7.0 on RHEL 10, Red Hat JBoss Web Server 7.0 on RHEL 8, Red Hat JBoss Web Server 7.0 on RHEL 9 · Red Hat
  5. 2026-10-09 Fix available: RHSA-2026:76956 · Red Hat
  6. 2026-10-09 Fix available: Red Hat JBoss Web Server 7.0.2 · Red Hat
  7. 2026-10-30 Fix available: RHSA-2026:92863 · Red Hat
  8. 2026-10-30 Fix available: RHSA-2026:92871 · Red Hat
  9. 2026-10-30 Fix available: RHSA-2026:92870 · Red Hat
  10. 2026-10-30 Fix available: Red Hat Enterprise Linux AppStream E4S (v.9.2), Red Hat Enterprise Linux AppStream E4S (v.9.4), Red Hat Enterprise Linux AppStream EUS (v. 10.0) +1 · Red Hat
  11. 2026-10-30 Fix available: RHSA-2026:92872 · Red Hat
  12. 2026-11-02 Fix available: RHSA-2026:93469 · Red Hat
  13. 2026-11-02 Fix available: Red Hat Enterprise Linux AppStream (v. 9) · Red Hat

References

Advisory 2

  • 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

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences