Redirect-Limit Bypass in Apache Traffic Server

Publication date: 2026-07-29

Last updated on: 2026-07-29

Assigner: Apache Software Foundation

Description

Apache Traffic Server allows redirect-limit bypass when plugins reset the retry counter, enabling SSRF amplification. 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

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Meta Information

Published

2026-07-29

Last Modified

2026-07-29

Generated

2026-07-30

AI Q&A

2026-07-30

EPSS Evaluated

N/A

NVD

CVE-2026-58189

Affected Vendors & Products

Vendor	Product	Version / Range
apache	traffic_server	From 8.0.0 (inc) to 8.1.9 (inc)
apache	traffic_server	From 9.0.0 (inc) to 9.2.14 (inc)
apache	traffic_server	From 10.0.0 (inc) to 10.1.3 (inc)
apache	traffic_server	9.2.15
apache	traffic_server	10.1.4

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-918	The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

Attack-Flow Graph

Executive Summary

Apache Traffic Server has a vulnerability where plugins can reset the retry counter during redirects, allowing attackers to bypass redirect limits. This enables Server-Side Request Forgery (SSRF) amplification, where malicious requests can be chained to access internal systems.

Impact Analysis

This vulnerability could allow attackers to perform SSRF attacks, potentially accessing internal services or sensitive data. It may also enable amplification attacks, increasing the impact of malicious requests on your systems.

Mitigation Strategies

Upgrade Apache Traffic Server to version 9.2.15 or 10.1.4 or later to address the redirect-limit bypass vulnerability.

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