Apache Traffic Server (ATS) Chunked Req Smuggling 8.0.010.1.3
CVE-2026-57834 Published on July 29, 2026
Apache Traffic Server: Malformed chunked message body allows request smuggling
Apache Traffic Server allows request smuggling if chunked messages are malformed.
This issue affects Apache Traffic Server: from 8.0.0 through 8.1.9, 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.
Vulnerability Analysis
CVE-2026-57834 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and a small impact on availability.
Weakness Type
What is a HTTP Request Smuggling Vulnerability?
When malformed or abnormal HTTP requests are interpreted by one or more entities in the data flow between the user and the web server, such as a proxy or firewall, they can be interpreted inconsistently, allowing the attacker to "smuggle" a request to one device without the other device being aware of it.
CVE-2026-57834 has been classified to as a HTTP Request Smuggling vulnerability or weakness.
Products Associated with CVE-2026-57834
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Affected Versions
Apache Software Foundation Apache Traffic Server:- Version 8.0.0, <= 8.1.9 is affected.
- Version 9.0.0, <= 9.2.14 is affected.
- Version 10.0.0, <= 10.1.3 is affected.