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oss-secCVE-2026-59173: Apache Traffic Server is vulnerable to stalled HTTP/2 flow-control

Apache Traffic Server is vulnerable to stalled HTTP/2 flow-control.

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

Severity: important

Reported By: Okta Red Team

Vendor: The Apache Software Foundation

Version Affected: ATS 9.0.0 to 9.2.13 ATS 10.0.0 to 10.1.2

Mitigation: 9.x users should upgrade to 9.2.14 or later versions 10.x users should upgrade to 10.1.3 or later versions

Reference: https://www.cve.org/CVERecord?id=CVE-2026-59173

First published (updated )
https://seclists.org/oss-sec/2026/q3/162

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