Chunked Transfer Delay Vulnerability in Apache Traffic Server
CVE-2026-111817

6.9MEDIUM

Key Information:

Vendor

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

What is CVE-2026-111817?

Apache Traffic Server has a vulnerability that causes it to stall during chunked transfers when trailer bytes are dropped, which can lead to delays until the connection times out. This behavior occurs because the server continues to wait for the trailer bytes, although they have already been discarded. By default, trailer dropping is enabled in versions 10.x, whereas it is disabled in versions 8.1.11 and 9.2.x unless specifically enabled. Users are advised to upgrade to versions 10.1.5 or 10.2.1 to mitigate this issue.

Affected Version(s)

Apache Traffic Server 8.1.11

Apache Traffic Server 9.2.5 <= 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:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Omkhar Arasaratnam
.