Request Smuggling Vulnerability in Apache Traffic Server
CVE-2026-111809

6.9MEDIUM

Key Information:

Vendor

Apache
Status
Apache Traffic Server
Vendor
CVE Published:
21 October 2026

What is CVE-2026-111809?

Apache Traffic Server is susceptible to request smuggling attacks via specially crafted HEAD requests that include Content-Length or Transfer-Encoding headers. This vulnerability can lead to the manipulation of request handling by intermediaries and potentially introduce security risks to users. It is essential for administrators to be aware of these vulnerabilities and implement recommended updates to protect their systems.

Affected Version(s)

Apache Traffic Server 8.0.0 <= 8.1.11

Apache Traffic Server 9.0.0 <= 9.2.15

Apache Traffic Server 10.0.0 <= 10.1.4

References

https://lists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb1...
vendor-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Apache Community
.