Description
Apache Traffic Server is vulnerable to HTTP/2 setting flood attacks. Earlier versions of Apache Traffic Server didn't limit the number of setting frames sent from the client using the HTTP/2 protocol. Users should upgrade to Apache Traffic Server 7.1.7, 8.0.4, or later versions.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | Apache Traffic Server | Apache Traffic Server 6.0.0 to 6.2.3, 7.0.0 to 7.1.6, and 8.0.0 to 8.0.3 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 12 | trafficserver | 8.0.5+ds-1 | — |
| Debian 10 | trafficserver | 8.0.2+ds-1+deb10u1 | DSA-4520-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | trafficserver | No fix yet | — |
| Ubuntu 16.04 LTS | trafficserver | No fix yet | — |
Advisories 2
- DSA-4520-1 trafficserver - security update Debian Security (DSA / DLA) · Mar 9, 2026
- WID-SEC-2026-0426 Apache Traffic Server: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Feb 16, 2026
References
- [trafficserver-dev] 20190813 Apache Traffic Server is vulnerable to various HTTP/2 attacks mailing-list
- [trafficserver-users] 20190813 Apache Traffic Server is vulnerable to various HTTP/2 attacks mailing-list
- [trafficserver-announce] 20190813 Apache Traffic Server is vulnerable to various HTTP/2 attacks mailing-list