CVE-2026-111808
Apache Traffic Server: HTTP/2 DATA frame padding underflow lets a client trigger backend worker-pool exhaustion
CVSS Score
8.6
EPSS Score
0.0%
EPSS Percentile
0th
Apache Traffic Server can be used to exhaust an HTTP/1.1 origin's worker pool via a malformed padded HTTP/2 DATA frame. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.15, from 10.0.0 through 10.1.4, 10.2.0. Users are recommended to upgrade to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue.
| CWE | CWE-191 |
| Vendor | apache software foundation |
| Product | apache traffic server |
| Published | Oct 21, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
Apache Software Foundation / Apache Traffic Server
8.0.0 ≤ 8.1.11 9.0.0 ≤ 9.2.15 10.0.0 ≤ 10.1.4 10.2.0
References
Credits
🔍 Khalilov Moe (LeetProtect) 🔍 The ASF