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

- Exploited (CISA KEV): no
- Published: 2026-04-09
- CVSS: 7.5 HIGH (v3.1)
- EPSS: 0.7% (53th percentile)
- CWE: CWE-444

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.

## Edge WAF coverage (claimed by vendors, not measured)

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | No public claim | — | — |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | No public claim | — | — |
| Fastly | Before feed history | — | — |
| F5 | Rule published | 2026-09-16 | — |
| Akamai | No public source | — | — |
| OWASP CRS | No public claim | — | — |

### F5

- 2026-09-16 · updated · rule 200020232
  > Updated: signature 200020232 "Chunk-Extension Request Smuggling" (HTTP Parser Attack, risk High), systems: ASP.NET, Other Web Server, Apache Tomcat. References: CVE-2025-55315, CVE-2025-22871, CVE-2026-24880.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog

"No public claim" means no vendor statement names this CVE; "Before feed history" means the CVE is older than the vendor feed. In both cases generic rules may still block it.

HTML: https://cve.vigilbase.com/cve/CVE-2026-24880 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2026-24880