HTTP/2 Content-Length Handling Flaw in Apache Traffic Server
CVE-2026-111805

7.7HIGH

Key Information:

Vendor

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

What is CVE-2026-111805?

A vulnerability has been identified in Apache Traffic Server, where a truncated HTTP/2 Content-Length value can lead to the exhaustion of an HTTP/1.1 origin's worker pool. This flaw could potentially disrupt web services relying on Apache Traffic Server, necessitating urgent attention from users to mitigate the risk. It is recommended to upgrade to versions 9.2.16, 10.1.5, or 10.2.1 to address this issue.

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:
7.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

matrix_cain (YakLang)
Alieldeen Khaled Ali
Jesse Yang
Alex Williams (Pellera Technologies)
VulnCheck
The ASF
.