CVE-2026-24880

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.

How to fix CVE-2026-24880

To remediate CVE-2026-24880, upgrade the affected package to a fixed version below.

• —upgrade to 9.0.116 or later
• —no fix listed
• —no fix listed
• —upgrade to 9.0.70-2 or later
• —upgrade to 9.0.116 or later
• —upgrade to 9.0.116 or later

Is CVE-2026-24880 being exploited?

Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.

Affected packages (6)

• from 0, < 9.0.116, >= 10.1.0, < 10.1.53, >= 11.0.0, < 11.0.20
• from 0
• from 0
• from 0, < 9.0.70-2
• >= 7.0.0, < 9.0.116
• >= 7.0.0, < 9.0.116

CVSS scores

References (15)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-24880
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2026-24880
• PATCHgithub.com/apache/tomcat
• WEBgithub.com/apache/tomcat/commit/1b586d6aa8ae65726da5fa8799427b5d4718478a