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TI-2026-20066 Aliases CVE-2026-24880GHSA-563x-q5rq-57qp

Apache Tomcat: Request smuggling via invalid chunk extension

Priority MEDIUM 40CWE-444Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · High · 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

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in Apache Tomcat via invalid chunk extension. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.18, from 10.1.0-M1 through 10.1.52, from 9.0.0.M1 through 9.0.115, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Other, unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.20, 10.1.52 or 9.0.116, which fix the issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00709 53rd percentileScored 2026-11-07
Fix Partial org.apache.tomcat:tomcat-coyote (Maven): 9.0.116, 10.1.52, 11.0.20org.apache.tomcat.embed:tomcat-embed-core (Maven): 9.0.116, 10.1.52, 11.0.20Red 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 – 11.0.18; 10.1.0-M1 – 10.1.52; 9.0.0.M1 – 9.0.115; 8.5.0 – 8.5.100; 7.0.0 – 7.0.109—No fix listedCNA
—org.apache.tomcat:tomcat-coyote (Maven)7.0.0 to before 9.0.1169.0.116Patch availableGHSA-563x-q5rq-57qp
—org.apache.tomcat:tomcat-coyote (Maven)10.1.0-M1 to before 10.1.5210.1.52Patch availableGHSA-563x-q5rq-57qp
—org.apache.tomcat:tomcat-coyote (Maven)11.0.0-M1 to before 11.0.2011.0.20Patch availableGHSA-563x-q5rq-57qp
—org.apache.tomcat.embed:tomcat-embed-core (Maven)7.0.0 to before 9.0.1169.0.116Patch availableGHSA-563x-q5rq-57qp
—org.apache.tomcat.embed:tomcat-embed-core (Maven)10.1.0-M1 to before 10.1.5210.1.52Patch availableGHSA-563x-q5rq-57qp
—org.apache.tomcat.embed:tomcat-embed-core (Maven)11.0.0-M1 to before 11.0.2011.0.20Patch availableGHSA-563x-q5rq-57qp
  • Apache Tomcat VendorApache Affected 11.0.0-M1 – 11.0.18; 10.1.0-M1 – 10.1.52; 9.0.0.M1 – 9.0.115; 8.5.0 – 8.5.100; 7.0.0 – 7.0.109 Fixed in — No fix listed CNA
  • org.apache.tomcat:tomcat-coyote (Maven) Vendor— Affected 7.0.0 to before 9.0.116 Fixed in 9.0.116 Patch available GHSA-563x-q5rq-57qp
  • org.apache.tomcat:tomcat-coyote (Maven) Vendor— Affected 10.1.0-M1 to before 10.1.52 Fixed in 10.1.52 Patch available GHSA-563x-q5rq-57qp
  • org.apache.tomcat:tomcat-coyote (Maven) Vendor— Affected 11.0.0-M1 to before 11.0.20 Fixed in 11.0.20 Patch available GHSA-563x-q5rq-57qp
  • org.apache.tomcat.embed:tomcat-embed-core (Maven) Vendor— Affected 7.0.0 to before 9.0.116 Fixed in 9.0.116 Patch available GHSA-563x-q5rq-57qp
  • org.apache.tomcat.embed:tomcat-embed-core (Maven) Vendor— Affected 10.1.0-M1 to before 10.1.52 Fixed in 10.1.52 Patch available GHSA-563x-q5rq-57qp
  • org.apache.tomcat.embed:tomcat-embed-core (Maven) Vendor— Affected 11.0.0-M1 to before 11.0.20 Fixed in 11.0.20 Patch available GHSA-563x-q5rq-57qp

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*9.0.0 to before 9.0.116; 10.1.0 to before 10.1.53; 11.0.0 to before 11.0.20VulnerableApache
  • cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* Versions 9.0.0 to before 9.0.116; 10.1.0 to before 10.1.53; 11.0.0 to before 11.0.20 Vulnerable ·Apache

Remediation

  • Fix · GHSA-563x-q5rq-57qp org.apache.tomcat:tomcat-coyote (Maven) Fixed in 9.0.116 Advisory →
  • Fix · GHSA-563x-q5rq-57qp org.apache.tomcat:tomcat-coyote (Maven) Fixed in 10.1.52 Advisory →
  • Fix · GHSA-563x-q5rq-57qp org.apache.tomcat:tomcat-coyote (Maven) Fixed in 11.0.20 Advisory →
  • Fix · GHSA-563x-q5rq-57qp org.apache.tomcat.embed:tomcat-embed-core (Maven) Fixed in 9.0.116 Advisory →
  • Fix · GHSA-563x-q5rq-57qp org.apache.tomcat.embed:tomcat-embed-core (Maven) Fixed in 10.1.52 Advisory →
  • Fix · GHSA-563x-q5rq-57qp org.apache.tomcat.embed:tomcat-embed-core (Maven) Fixed in 11.0.20 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 5AffectedNo fix yet: Fix deferred
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-2026-24880
  2. 2026-10-03 Alias added: GHSA-563x-q5rq-57qp
  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 11

  • 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