Vulnerability Details CVE-2026-58155
Apache Traffic Server truncates over-long header names, allowing header aliasing, request smuggling, and policy bypass.
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 17.8%
CVSS Severity
CVSS v3 Score 9.3
Products affected by CVE-2026-58155
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cpe:2.3:a:apache:traffic_server:10.0.0
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cpe:2.3:a:apache:traffic_server:10.0.1
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cpe:2.3:a:apache:traffic_server:10.0.2
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cpe:2.3:a:apache:traffic_server:10.0.3
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cpe:2.3:a:apache:traffic_server:10.0.4
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cpe:2.3:a:apache:traffic_server:10.0.5
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cpe:2.3:a:apache:traffic_server:10.0.6
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cpe:2.3:a:apache:traffic_server:10.1.0
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cpe:2.3:a:apache:traffic_server:10.1.1
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cpe:2.3:a:apache:traffic_server:10.1.2
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cpe:2.3:a:apache:traffic_server:10.1.3
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cpe:2.3:a:apache:traffic_server:8.0.0
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cpe:2.3:a:apache:traffic_server:8.0.1
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cpe:2.3:a:apache:traffic_server:8.0.2
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cpe:2.3:a:apache:traffic_server:8.0.3
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cpe:2.3:a:apache:traffic_server:8.0.4
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cpe:2.3:a:apache:traffic_server:8.0.5
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cpe:2.3:a:apache:traffic_server:8.0.6
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cpe:2.3:a:apache:traffic_server:8.0.7
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cpe:2.3:a:apache:traffic_server:8.0.8
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cpe:2.3:a:apache:traffic_server:8.1.0
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cpe:2.3:a:apache:traffic_server:8.1.1
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cpe:2.3:a:apache:traffic_server:8.1.2
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cpe:2.3:a:apache:traffic_server:8.1.3
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cpe:2.3:a:apache:traffic_server:8.1.4
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cpe:2.3:a:apache:traffic_server:8.1.5
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cpe:2.3:a:apache:traffic_server:8.1.6
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cpe:2.3:a:apache:traffic_server:8.1.7
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cpe:2.3:a:apache:traffic_server:8.1.8
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cpe:2.3:a:apache:traffic_server:8.1.9