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Tomcat CVE-2026-24880

| EUVDEUVD-2026-21006 HIGH
HTTP Request/Response Smuggling (CWE-444)
2026-04-09 apache GHSA-563x-q5rq-57qp
Apache Information Disclosure Red Hat Tomcat Request Smuggling Suse Apache Tomcat Apache Software Foundation
High
Disputed · 7.5 NVD
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Severity by source

Sources disagree (Low–High)
NVD PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
SUSE
HIGH
qualitative
Red Hat
4.3 LOW
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorNVD

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

Lifecycle Timeline

4
Patch released
Apr 11, 2026 - 02:30 nvd
Patch available
EUVD ID Assigned
Apr 09, 2026 - 19:45 euvd
EUVD-2026-21006
Analysis Generated
Apr 09, 2026 - 19:45 vuln.today
CVE Published
Apr 09, 2026 - 19:12 nvd
HIGH 7.5

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 2 maven packages depend on org.apache.tomcat.embed:tomcat-embed-core (2 direct, 0 indirect)
  • 14 maven packages depend on org.apache.tomcat:tomcat-catalina (13 direct, 1 indirect)
  • 2 maven packages depend on org.apache.tomcat:tomcat-coyote (2 direct, 0 indirect)
  • 1 maven packages depend on org.apache.tomcat:tomcat-tribes (1 direct, 0 indirect)

Ecosystem-wide dependent count for version 7.0.0 and other introduced versions.

DescriptionCVE.org

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.

AnalysisAI

HTTP request smuggling in Apache Tomcat 7.x through 11.x permits unauthenticated remote attackers to manipulate request routing and bypass security controls via malformed chunk extension processing. Exploitation enables header injection, cache poisoning, and request routing manipulation without code execution. Affects Tomcat 7.0.0-7.0.109, 8.5.0-8.5.100, 9.0.0.M1-9.0.115, 10.1.0-M1-10.1.52, and 11.0.0-M1-11.0.18. No public exploit identified at time of analysis. Low observed exploitation activity (EPSS 0.02%).

Technical ContextAI

CWE-444 HTTP request smuggling through inconsistent chunk extension parsing. Tomcat's HTTP/1.1 chunked transfer encoding implementation fails to validate chunk extension syntax, allowing attackers to inject ambiguous requests that intermediary proxies and backend servers interpret differently. This desynchronization enables request boundary manipulation without requiring authentication (CVSS PR:N).

RemediationAI

Vendor-released patch: upgrade immediately to Apache Tomcat 11.0.20, 10.1.52, or 9.0.116 depending on deployment branch. For Tomcat 8.5.x and 7.x branches (end-of-life), migrate to supported versions 9.0.116+ or implement strict HTTP parsing via fronting reverse proxy with validated chunked encoding enforcement. Deploy Web Application Firewall rules blocking malformed chunk extensions as temporary mitigation. Verify intermediary proxy configurations for consistent HTTP/1.1 chunked encoding validation. Official advisory: https://lists.apache.org/thread/2c682qnlg2tv4o5knlggqbl9yc2gb5sn. Monitor NVD for updated guidance: https://nvd.nist.gov/vuln/detail/CVE-2026-24880

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Vendor StatusVendor

SUSE

Severity: High
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected

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CVE-2026-24880 vulnerability details – vuln.today
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