Downgrade Request Smuggling Vulnerability in Apache Traffic Server
CVE-2026-58150

7.8HIGH

Key Information:

Vendor

Apache
Status
Apache Traffic Server
Vendor
CVE Published:
29 July 2026

What is CVE-2026-58150?

Apache Traffic Server contains a vulnerability that allows for downgrade request smuggling due to the improper handling of the Transfer-Encoding header in HTTP/2 requests. This flaw could allow malicious users to exploit the system by sending crafted requests, resulting in potential data leakage or unauthorized actions. Upgrading to version 9.2.15 or 10.1.4 is highly recommended to mitigate this vulnerability. For more detailed information, please refer to the official advisory from Apache.

Affected Version(s)

Apache Traffic Server 8.0.0 <= 8.1.9

Apache Traffic Server 9.0.0 <= 9.2.14

Apache Traffic Server 10.0.0 <= 10.1.3

References

https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnoky...
vendor-advisory

CVSS V4

Score:
7.8
Severity:
HIGH
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Apache Community
.