Apache Tomcat: HTTP/2 trailer header cross-contamination

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-88041
StatePUBLISHED
Assignerapache
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-20 14:17:04 UTC
Updated2026-10-29 18:17:36 UTC
DescriptionIncomplete 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS: 0.002500000 probability, percentile 0.163950000 (date 2026-10-29)

Problem Types: CWE-459 | CWE-459 CWE-459 Incomplete cleanup

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Apache Software Foundation Apache Tomcat affected 11.0.0-M23 11.0.26 semver Not specified
CNA Apache Software Foundation Apache Tomcat affected 10.1.27 10.1.60 semver Not specified
CNA Apache Software Foundation Apache Tomcat affected 9.0.92 9.0.122 semver Not specified

References

ReferenceSourceLinkTags
lists.apache.org/thread.html/dnmm9l3byytg3l66nk1jrqfrl7jty7n1 [email protected] lists.apache.org
www.openwall.com/lists/oss-security/2026/10/20/24 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Wentao He (en)

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