CVE-2026-88041: Apache Tomcat: HTTP/2 trailer header cross-contamination

Published Oct 20, 2026
·
Updated

Incomplete cleanup vulnerability in Apache Tomcat allowed an trailer information from a previous request to leak into a subsequent request.

This issue affects Apache Tomcat: from 11.0.0 through 11.0.26, from 10.1.27 through 10.1.60, from 9.0.92 through 9.0.122.

Users are recommended to upgrade to version 11.0.27, 10.1.61 or 9.0.123, which fix the issue.

Other sources

Incomplete cleanup vulnerability in Apache Tomcat allowed an trailer information from a previous request to leak into a subsequent request.

This issue affects Apache Tomcat: from 11.0.0-M23 through 11.0.26, from 10.1.27 through 10.1.60, from 9.0.92 through 9.0.122.

Users are recommended to upgrade to version 11.0.27, 10.1.61 or 9.0.123, which fix the issue.

— NVD

Affected Software

27 affected componentsFixes available
Apache Tomcat>=11.0.0-M23<=11.0.26, >=10.1.27<=10.1.60, >=9.0.92<=9.0.122
bitnami/tomcat>=9.0.92<9.0.123
9.0.123
bitnami/tomcat>=10.1.27<10.1.61
10.1.61
bitnami/tomcat>=11.0.0<11.0.27
11.0.27
ubuntu/tomcat6*
ubuntu/tomcat8*
ubuntu/tomcat7*
ubuntu/tomcat8*
ubuntu/tomcat9*
ubuntu/tomcat9*
ubuntu/tomcat10*
ubuntu/tomcat9*
ubuntu/tomcat10*
ubuntu/tomcat11*
ubuntu/tomcat9*
ubuntu/tomcat10*
ubuntu/tomcat9*
ubuntu/tomcat11*
debian/tomcat10*
debian/tomcat10*
debian/tomcat10*
debian/tomcat9<9.0.70-2
9.0.70-2
debian/tomcat9<9.0.70-2
9.0.70-2
debian/tomcat9<9.0.70-2
9.0.70-2
debian/tomcat10<=10.1.55-1~deb12u1, <=10.1.55-1~deb13u1, <=10.1.60-1
debian/tomcat11<=11.0.22-1~deb13u1, <=11.0.24-1
debian/tomcat9
9.0.70-29.0.95-19.0.122-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade bitnami/tomcat to a version that resolves this vulnerability.

    Fixed in 9.0.123
  2. Upgrade

    Upgrade bitnami/tomcat to a version that resolves this vulnerability.

    Fixed in 10.1.61
  3. Upgrade

    Upgrade bitnami/tomcat to a version that resolves this vulnerability.

    Fixed in 11.0.27
  4. Upgrade

    Upgrade debian/tomcat9 to a version that resolves this vulnerability.

    Fixed in 9.0.70-2
  5. Upgrade

    Upgrade debian/tomcat9 to a version that resolves this vulnerability.

    Fixed in 9.0.70-2Fixed in 9.0.95-1Fixed in 9.0.122-1
  6. Upgrade

    Upgrade Apache Tomcat to a version that resolves this vulnerability.

    Fixed in 11.0.27
  7. Upgrade

    Upgrade Apache Tomcat to a version that resolves this vulnerability.

    Fixed in 10.1.61
  8. Upgrade

    Upgrade Apache Tomcat to a version that resolves this vulnerability.

    Fixed in 9.0.123

Event History

Oct 20, 2026
CVE Published
via MITRE·01:43 PM
Data Sourced
via MITRE·01:43 PM
DescriptionWeakness
Data Sourced
via OSV·02:17 PM
DescriptionSeverityAffected Software
Data Sourced
via NVD·02:17 PM
DescriptionSeverityWeakness
Oct 29, 2026
Advisory Published
via OSV·09:02 AM

Frequently Asked Questions

1

Which deployments are affected?

Affected releases are Apache Tomcat 11.0.0-M23 through 11.0.26, 10.1.27 through 10.1.60, and 9.0.92 through 9.0.122.

2

What should teams upgrade to?

Upgrade to Apache Tomcat 11.0.27, 10.1.61, or 9.0.123, as applicable to the deployed major release line. These versions fix the issue.

Company

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Contact

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