Apache Tomcat has an HTTP Request/Response Smuggling vulnerability (CVE-2026-24880)

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps org.apache.tomcat.embed:tomcat-embed-core (maven), org.apache.tomcat.embed:tomcat-embed-core (maven), org.apache.tomcat.embed:tomcat-embed-core (maven), org.apache.tomcat:tomcat-coyote (maven) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
org.apache.tomcat.embed:tomcat-embed-coremaven	>=7.0.0 <9.0.116	9.0.116
org.apache.tomcat.embed:tomcat-embed-coremaven	>=10.1.0-M1 <10.1.52	10.1.52
org.apache.tomcat.embed:tomcat-embed-coremaven	>=11.0.0-M1 <11.0.20	11.0.20
org.apache.tomcat:tomcat-coyotemaven	>=7.0.0 <9.0.116	9.0.116
org.apache.tomcat:tomcat-coyotemaven	>=10.1.0-M1 <10.1.52	10.1.52
org.apache.tomcat:tomcat-coyotemaven	>=11.0.0-M1 <11.0.20	11.0.20

Recommended response

Check inventory. Check lockfiles and deployed manifests for org.apache.tomcat.embed:tomcat-embed-core, org.apache.tomcat.embed:tomcat-embed-core, org.apache.tomcat.embed:tomcat-embed-core.
Review the reported fix. Update org.apache.tomcat.embed:tomcat-embed-core to 9.0.116; org.apache.tomcat.embed:tomcat-embed-core to 10.1.52; org.apache.tomcat.embed:tomcat-embed-core to 11.0.20; org.apache.tomcat:tomcat-coyote to 9.0.116; org.apache.tomcat:tomcat-coyote to 10.1.52; org.apache.tomcat:tomcat-coyote to 11.0.20 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Apr 9, 2026
Evidence: source:osv:source_dates:source-dates:record
Source modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:record
First seen by HOL
Sep 11, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.