Vulnerability · Published Apr 9, 2026 · Assigned by apache
CVE-2026-24880Apache Tomcat: Request smuggling via invalid chunk extension
High 7.5
In plain English
A high-severity security flaw in Apache Tomcat from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | tomcat | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat | 1:9.0.117-1.el9_8 | ALSA-2026:26323 |
| AlmaLinux:8 | tomcat-admin-webapps | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat-admin-webapps | 1:9.0.117-1.el9_8 | ALSA-2026:26323 |
| AlmaLinux:8 | tomcat-docs-webapp | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat-docs-webapp | 1:9.0.117-1.el9_8 | ALSA-2026:26323 |
| AlmaLinux:8 | tomcat-el-3.0-api | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat-el-3.0-api | 1:9.0.117-1.el9_8 | ALSA-2026:26323 |
| AlmaLinux:8 | tomcat-jsp-2.3-api | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat-jsp-2.3-api | 1:9.0.117-1.el9_8 | ALSA-2026:26323 |
| AlmaLinux:8 | tomcat-lib | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat-lib | 1:9.0.117-1.el9_8 | ALSA-2026:26323 |
| AlmaLinux:8 | tomcat-servlet-4.0-api | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat-servlet-4.0-api | 1:9.0.117-1.el9_8 | ALSA-2026:26323 |
| AlmaLinux:8 | tomcat-webapps | 1:9.0.120-1.el8_10 | ALSA-2026:68677 |
| AlmaLinux:9 | tomcat-webapps | 1:9.0.117-1.el9_8 | ALSA-2026:26323 |
| AlmaLinux:10 | tomcat9 | 1:9.0.117-2.el10_2.alma.1 | ALSA-2026:36790 |
| AlmaLinux:10 | tomcat9 | 1:9.0.117-1.el10_2.alma.1 | ALSA-2026:25341 |
| AlmaLinux:10 | tomcat9-admin-webapps | 1:9.0.117-2.el10_2.alma.1 | ALSA-2026:36790 |
| AlmaLinux:10 | tomcat9-admin-webapps | 1:9.0.117-1.el10_2.alma.1 | ALSA-2026:25341 |
| AlmaLinux:10 | tomcat9-docs-webapp | 1:9.0.117-2.el10_2.alma.1 | ALSA-2026:36790 |
| AlmaLinux:10 | tomcat9-docs-webapp | 1:9.0.117-1.el10_2.alma.1 | ALSA-2026:25341 |
| AlmaLinux:10 | tomcat9-el-3.0-api | 1:9.0.117-1.el10_2.alma.1 | ALSA-2026:25341 |
| AlmaLinux:10 | tomcat9-el-3.0-api | 1:9.0.117-2.el10_2.alma.1 | ALSA-2026:36790 |
| AlmaLinux:10 | tomcat9-jsp-2.3-api | 1:9.0.117-2.el10_2.alma.1 | ALSA-2026:36790 |
| AlmaLinux:10 | tomcat9-jsp-2.3-api | 1:9.0.117-1.el10_2.alma.1 | ALSA-2026:25341 |
| AlmaLinux:10 | tomcat9-lib | 1:9.0.117-2.el10_2.alma.1 | ALSA-2026:36790 |
| AlmaLinux:10 | tomcat9-lib | 1:9.0.117-1.el10_2.alma.1 | ALSA-2026:25341 |
| AlmaLinux:10 | tomcat9-servlet-4.0-api | 1:9.0.117-2.el10_2.alma.1 | ALSA-2026:36790 |
| AlmaLinux:10 | tomcat9-servlet-4.0-api | 1:9.0.117-1.el10_2.alma.1 | ALSA-2026:25341 |
| AlmaLinux:10 | tomcat9-webapps | 1:9.0.117-1.el10_2.alma.1 | ALSA-2026:25341 |
| AlmaLinux:10 | tomcat9-webapps | 1:9.0.117-2.el10_2.alma.1 | ALSA-2026:36790 |
| Debian:12 | tomcat10 | 10.1.55-1~deb12u1 | DEBIAN-CVE-2026-24880 |
| Debian:13 | tomcat10 | 10.1.55-1~deb13u1 | DEBIAN-CVE-2026-24880 |
| Debian:14 | tomcat10 | 10.1.54-1 | DEBIAN-CVE-2026-24880 |
| Debian:13 | tomcat11 | 11.0.22-1~deb13u1 | DEBIAN-CVE-2026-24880 |
| Debian:14 | tomcat11 | 11.0.21-1 | DEBIAN-CVE-2026-24880 |
| Debian:12 | tomcat9 | 9.0.70-2 | DEBIAN-CVE-2026-24880 |
| Debian:13 | tomcat9 | 9.0.70-2 | DEBIAN-CVE-2026-24880 |
| Debian:14 | tomcat9 | 9.0.70-2 | DEBIAN-CVE-2026-24880 |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | 11.0.20 | GHSA-563x-q5rq-57qp |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | 9.0.116 | GHSA-563x-q5rq-57qp |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | 10.1.52 | GHSA-563x-q5rq-57qp |
| Maven | org.apache.tomcat:tomcat-coyote | 11.0.20 | GHSA-563x-q5rq-57qp |
| Maven | org.apache.tomcat:tomcat-coyote | 10.1.52 | GHSA-563x-q5rq-57qp |
| Maven | org.apache.tomcat:tomcat-coyote | 9.0.116 | GHSA-563x-q5rq-57qp |
| Rocky Linux:10 | tomcat9 | 1:9.0.117-1.el10_2 | RLSA-2026:25341 |
| Ubuntu:24.04:LTS | tomcat10 | no fix listed | UBUNTU-CVE-2026-24880 |
| Ubuntu:25.10 | tomcat10 | no fix listed | UBUNTU-CVE-2026-24880 |
| Ubuntu:26.04:LTS | tomcat10 | no fix listed | UBUNTU-CVE-2026-24880 |
| Ubuntu:25.10 | tomcat11 | no fix listed | UBUNTU-CVE-2026-24880 |
| Ubuntu:26.04:LTS | tomcat11 | no fix listed | UBUNTU-CVE-2026-24880 |
| Ubuntu:24.04:LTS | tomcat9 | no fix listed | UBUNTU-CVE-2026-24880 |
| Ubuntu:25.10 | tomcat9 | no fix listed | UBUNTU-CVE-2026-24880 |
| Ubuntu:26.04:LTS | tomcat9 | no fix listed | UBUNTU-CVE-2026-24880 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache Tomcat | 11.0.0-M1 – through 11.0.1810.1.0-M1 – through 10.1.529.0.0.M1 – through 9.0.1158.5.0 – through 8.5.1007.0.0 – through 7.0.109 |
Weakness: CWE-444 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N