What’s Vulnerable › Vulnerabilities

CVE-2026-24880: Apache Tomcat: Request smuggling via invalid chunk extension

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-09 · updated 2026-10-26
• Weakness: CWE-444

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.

Affected products

• Apache Tomcat: from 9.0.0 before 9.0.116; from 10.1.0 before 10.1.53; from 11.0.0 before 11.0.20 — fixed in 9.0.116, 10.1.53, 11.0.20

How to fix

Upgrade to a fixed version: Apache Tomcat 9.0.116, 10.1.53, 11.0.20. Check the vendor advisory for mitigations.

References

• https://lists.apache.org/thread/2c682qnlg2tv4o5knlggqbl9yc2gb5sn
• http://www.openwall.com/lists/oss-security/2026/04/09/20

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