Apache Traffic Server 8.x-10.x webp_transform Unsafely Decode & Cacheable Response
CVE-2026-58186 Published on July 29, 2026
Apache Traffic Server: webp_transform plugin decodes unsafely and mislabels degraded responses
The Apache Traffic Server webp_transform plugin can decode unsafely and serve mislabeled, cacheable responses.
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.
Vulnerability Analysis
CVE-2026-58186 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
Improper Input Validation
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
Products Associated with CVE-2026-58186
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Affected Versions
Apache Software Foundation Apache Traffic Server:- Version 8.0.0, <= 8.1.9 is affected.
- Version 9.0.0, <= 9.2.14 is affected.
- Version 10.0.0, <= 10.1.3 is affected.