CVE-2026-58150

Critical

Description

Apache Traffic Server does not reject Transfer-Encoding in HTTP/2 requests, allowing downgrade request smuggling. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, 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.

SeverityCritical

CVSS10.0

Exploit probability—

Product

Apache Traffic Server

PublishedJul 29, 2026

First seenJul 29, 2026

Weakness typeCWE-444CWE-444

How to fix

Update

apache traffic_server9.2.15, 10.1.4 or later

Vendor advisories

lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d

Affected products

Product	Affected versions	Fixed in
apache traffic_server	8.0.0 ≤ v ≤ 8.1.9, 9.0.0 ≤ v < 9.2.15, 10.0.0 ≤ v < 10.1.4	9.2.15, 10.1.4

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