Labstack Echo up to 4.16.0 Decompress middleware denial of service

Summaryinfo

A vulnerability has been found in Labstack Echo up to 4.16.0 and classified as problematic. Affected by this issue is some unknown functionality of the component Decompress middleware. The manipulation leads to denial of service. This vulnerability is referenced as CVE-2026-118261. Remote exploitation of the attack is possible. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Labstack Echo up to 4.16.0. It has been rated as problematic. This issue affects an unknown part of the component Decompress middleware. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability. The summary by CVE is:

Echo is a Go web framework. From 4.0.0 until 4.16.1, Echo v4's opt-in Decompress middleware exposes a gzip-decoded request stream without limiting its expanded size. A small compressed request can expand into a very large body when a handler reads or binds it, consuming excessive memory or CPU and allowing repeated or concurrent requests to cause denial of service. The middleware is not enabled by default, and limiting only the compressed request size does not bound the decoded size. This issue is fixed in 4.16.1.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-118261 since 10/27/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 4.16.1 eliminates this vulnerability.

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Productinfo

Vendor

• Labstack

Name

• Echo

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5
• 4.6
• 4.7
• 4.8
• 4.9
• 4.10
• 4.11
• 4.12
• 4.13
• 4.14
• 4.15
• 4.16.0

Website

• Product: https://github.com/labstack/echo/

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