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TI-2026-76844 Aliases CVE-2026-101356GHSA-w9r8-5j45-v8mg

Apache Tomcat HTTP/2 async processing mixes up requests between users

Priority MEDIUM 46CWE-362Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · None · High
Fix status
Partial Red Hat: 1 fixed, 3 without a fix

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

Summary

Apache Tomcat from 11.0.22 through 11.0.26, from 10.1.55 through 10.1.60, and from 9.0.118 through 9.0.122 is affected. Incorrect object recycling and reuse during HTTP/2 processing of asynchronous servlets is a race condition (CWE-362) that can mix up requests and responses between users. An unauthenticated remote attacker can trigger this mix-up over the network.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

Incorrect object recycling and re-use vulnerability in Apache Tomcat affecting HTTP/2 processing of asynchronous servlets can trigger request and/or response mix-up between users. This issue affects Apache Tomcat: from 11.0.22 through 11.0.26, from 10.1.55 through 10.1.60, from 9.0.118 through 9.0.122. Users are recommended to upgrade to version 11.0.27, 10.1.61 or 9.0.123, which fixes the issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00499 43rd percentileScored 2026-11-07
Fix Partial Red Hat: 2 advisoriesRed Hat: 1 fixed, 3 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 Tomcat11.0.22 – 11.0.26; 10.1.55 – 10.1.60; 9.0.118 – 9.0.122—No fix listedCNA
  • Apache Tomcat VendorApache Affected 11.0.22 – 11.0.26; 10.1.55 – 10.1.60; 9.0.118 – 9.0.122 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*——Apache
  • cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* Versions — — ·Apache

Remediation

Upgrade Apache Tomcat to version 11.0.27, 10.1.61 or 9.0.123, depending on the branch in use. Red Hat fixes Red Hat Hardened Images in RHSA-2026:85926 and RHSA-2026:81365. Red Hat lists Red Hat Enterprise Linux 8, 9 and 10 as affected without a fix, with no fix plan available.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Red Hat 2 advisories

  • RHSA-2026:85926 Released 2026-10-20 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images tomcat10-10.1.61-0.1.hum1@noarch@public-hummingbird-aarch64-rpms, tomcat10-10.1.61-0.1.hum1@noarch@public-hummingbird-s390x-rpms, tomcat10-10.1.61-0.1.hum1@noarch@public-hummingbird-x86_64-rpms +28
  • RHSA-2026:81365 Released 2026-10-12 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images tomcat11-11.0.27-0.1.hum1@noarch@public-hummingbird-aarch64-rpms, tomcat11-11.0.27-0.1.hum1@noarch@public-hummingbird-s390x-rpms, tomcat11-11.0.27-0.1.hum1@noarch@public-hummingbird-x86_64-rpms +28

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet
Red Hat Enterprise Linux 8AffectedNo fix yet
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat Hardened ImagesFixed RHSA-2026:81365, RHSA-2026:85926
Not affected: 9 products
  • Red Hat Enterprise Linux 10
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • Red Hat Hardened Images
  • Red Hat JBoss Web Server 5
  • Red Hat JBoss Web Server 6
  • Red Hat JBoss Web Server 7

Timeline

  1. 2026-10-20 Threatist record created from CVE-2026-101356
  2. 2026-10-20 Alias added: GHSA-w9r8-5j45-v8mg
  3. 2026-10-20 CVSS score added · CISA ADP
  4. 2026-10-20 Weakness changed · CISA ADP
  5. 2026-10-20 CISA SSVC decision points changed
  6. 2026-10-20 Priority changed: LOW → MEDIUM
  7. 2026-10-21 Fix available: RHSA-2026:85926 · Red Hat
  8. 2026-10-21 Fix available: RHSA-2026:81365 · Red Hat
  9. 2026-10-21 Fix available: Red Hat Hardened Images · Red Hat
  10. 2026-10-21 CVSS score added · Red Hat
  11. 2026-10-22 Affected versions changed · Red Hat

References

Advisory 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-2024-30292 Apache OFBiz: Confused controller-view authorization logic (forced browsing) KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-26062 Apache OFBiz: Unauthenticated endpoint could allow execution of screen rendering code KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-21190 Apache OFBiz: Path traversal leading to RCE KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-18186 Apache HugeGraph-Server: Command execution in gremlin KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-25106 Deserialization of untrusted data in Apache ActiveMQ KEVCVSS 3.1CRITICAL 10.0
See all 4053 →

Sources

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