CVE-2026-57834

Analyzed Analyzed - Analysis Complete

HTTP Request Smuggling in Apache Traffic Server

Publication date: 2026-07-29

Last updated on: 2026-08-03

Assigner: Apache Software Foundation

Description

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.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-07-29

Last Modified

2026-08-03

Generated

2026-08-18

AI Q&A

2026-07-29

EPSS Evaluated

2026-08-17

NVD

CVE-2026-57834

EUVD

EUVD-2026-50172

Affected Vendors & Products

Vendor	Product	Version / Range
apache	traffic_server	From 10.0.0 (inc) to 10.1.4 (exc)
apache	traffic_server	From 8.0.0 (inc) to 8.1.9 (inc)
apache	traffic_server	From 9.0.0 (inc) to 9.2.15 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-444	The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

Attack-Flow Graph

Executive Summary

Apache Traffic Server is vulnerable to request smuggling when chunked messages are malformed. This allows attackers to manipulate requests, potentially bypassing security controls or accessing unauthorized data.

Detection Guidance

Detecting this vulnerability requires monitoring Apache Traffic Server for malformed chunked messages. Check logs for HTTP request smuggling attempts or unusual traffic patterns. Use tools like tcpdump or Wireshark to inspect HTTP traffic for malformed chunked encoding. Enable debug logging in Apache Traffic Server to identify malformed requests.

Impact Analysis

This vulnerability can lead to unauthorized access to sensitive data, session hijacking, or bypassing security mechanisms. Attackers may exploit it to smuggle malicious requests through the server.

Compliance Impact

The vulnerability allows request smuggling due to malformed chunked messages, which could lead to unauthorized data access or manipulation. This may impact compliance with GDPR (data protection) and HIPAA (health data security) by exposing sensitive information or violating integrity requirements.

Mitigation Strategies

Upgrade Apache Traffic Server to version 9.2.15 or 10.1.4, as these versions contain fixes for the vulnerability.

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