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CVE-2026-59173: Apache Traffic Server: DoS vulnerability in HTTP/2 via stalled flow-control conditions

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-18 · updated 2026-10-24
• Weakness: CWE-400

Description

Uncontrolled Resource Consumption vulnerability in Apache Traffic Server. This issue affects Apache Traffic Server: from 9.0.0 through 9.1.13, from 10.0.0 through 10.1.2. Users are recommended to upgrade to version 9.1.14 or 10.1.3, which fixes the issue.

Affected products

• Apache Software Foundation Apache Traffic Server: from 9.0.0 before 9.2.14; from 10.0.0 before 10.1.3 — fixed in 10.1.3, 9.2.14

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache Traffic Server 10.1.3, 9.2.14. Check the vendor advisory for mitigations.

References

• https://lists.apache.org/thread/lhlbhphmv5dsfgx1fx84mgonzbocpzhd
• http://www.openwall.com/lists/oss-security/2026/07/17/5

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