CVE-2026-118261: DoS

Description

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.

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Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

CWE-409 CWE-409

References

Other References

https://github.com/labstack/echo/commit/3fb0ba7e17645bb65611e2a08875d0a2f65c421f https://github.com/labstack/echo/releases/tag/v4.16.1 https://github.com/labstack/echo/security/advisories/GHSA-h7wr-284f-5qvc

Frequently Asked Questions

What is CVE-2026-118261? +

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.

How do I check if I'm vulnerable to CVE-2026-118261? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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