Description
Apache Traffic Server forwards malformed HTTP chunked trailer section to origin servers. This can be utilized for request smuggling and may also lead cache poisoning if the origin servers are vulnerable.
This issue affects Apache Traffic Server: from 8.0.0 through 8.1.10, from 9.0.0 through 9.2.4.
Users can set a new setting (proxy.config.http.drop_chunked_trailers) not to forward chunked trailer section.
Users are recommended to upgrade to version 8.1.11 or 9.2.5, which fixes the issue.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache Traffic Server | 8.0.0 – ≤ 8.1.10, 9.0.0 – ≤ 9.2.4 | — |
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 | 9.2.5+ds-0+deb12u1 | DSA-5758-1 |
| Debian 11 | trafficserver | 8.1.11+ds-0+deb11u1 | DLA-3897-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | trafficserver | No fix yet | — |
| Ubuntu 18.04 LTS | trafficserver | No fix yet | — |
| Ubuntu 16.04 LTS | trafficserver | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | trafficserver | No fix yet | — |
| Ubuntu Pro 20.04 LTS | trafficserver | No fix yet | — |
Advisories 3
- DSA-5758-1 trafficserver - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3897-1 trafficserver - security update Debian Security (DSA / DLA) · Mar 9, 2026
- WID-SEC-2024-1713 Apache Traffic Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 26, 2024
References
- https://lists.apache.org/thread/c4mcmpblgl8kkmyt56t23543gp8v56m0 vendor-advisory