Medium · published July 29, 2026
Apache Traffic Server copies the client Host header into a fixed-size stack buffer without a bound during redirect handling, so an over-long Host header overflows the stack when redirect following is enabled.
This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3.
Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fix the issue.
| Product | Versions | Fixed in |
|---|---|---|
| apache/traffic_server | ≥ 8.0.0, ≤ 8.1.9 | — |
| apache/traffic_server | ≥ 9.0.0, < 9.2.15 | 9.2.15 |
| apache/traffic_server | ≥ 10.0.0, < 10.1.4 | 10.1.4 |