CVE WatchAug 31, 2026

CVE-2026-79658

Ech0 before 5.0.1 does not impose any size or shape limit on the Accept-Language header processed by its i18n middleware, which runs on ever

CVSS

7.5

High

EPSS

0.3%

p21

KEV

—

Exploit Today

0-100

Published: Aug 25, 2026 · Last modified: Aug 31, 2026 · CWE-400

EPSS · 30d

0.3%EPSS · 30 days0.3%

2026-08-262026-09-06

Technical description

Ech0 before 5.0.1 does not impose any size or shape limit on the Accept-Language header processed by its i18n middleware, which runs on every HTTP request. The header is passed unfiltered to go-i18n's NewLocalizer, which internally calls golang.org/x/text/language.ParseAcceptLanguage. The CVE-2022-32149 mitigation in x/text caps '-' characters but not '_' characters, which the parser aliases to '-', allowing quadratic-time parsing to be triggered with a large header (up to Go's default 1 MiB) built from underscore separators. An unauthenticated attacker can send such requests to consume roughly 1.5 seconds of CPU each, and concurrent requests can saturate a multi-core server (denial of service).

Official references

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