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High severity · published Apr 9, 2026
CVE-2026-24880
Apache Tomcat: Request smuggling via invalid chunk extension
7.5
CVSS
0.7%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 53% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TO
Tomcat · Apache
11.0.0-M1 through 11.0.18; 10.1.0-M1 through 10.1.52; 9.0.0.M1 through 9.0.115; 8.5.0 through 8.5.100; 7.0.0 through 7.0.109 · source: vendor, NVD
Affected product
TO
Tomcat
Apache
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-24880
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-24880
Mailing List
https://lists.apache.org/thread/2c682qnlg2tv4o5knlggqbl9yc2gb5sn
Mailing List
http://www.openwall.com/lists/oss-security/2026/04/09/20
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