GO-2026-5981 - Ech0: ParseAcceptLanguage `_` separator bypass enables ~70x CPU amplification via Accept-Language…

Severity: info · Published 2026-07-17

Ech0: ParseAcceptLanguage `_` separator bypass enables ~70x CPU amplification via Accept-Language header in i18n.Middleware in github.com/lin-snow/ech0

Technologies: github.com/lin-snow/ech0 (Go). Vendors: Go.

Quick answers

Is This vulnerability exploited in the wild?
No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.
How severe is This vulnerability?
Informational severity, published 17 July 2026.
Which products and versions are affected?
github.com/lin-snow/ech0 (Go) SEMVER:introduced=0.
Is there a fix for This vulnerability?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected?
Check whether you run github.com/lin-snow/ech0 (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • github.com/lin-snow/ech0 (Go) SEMVER:introduced=0

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.