CVE Watch16 jul 2026

CVE-2026-4926

Impact: A bad regular expression is generated any time you have multiple sequential optional groups (curly brace syntax), such as `{a}{b}{c

CVSS

7.5

Alto

EPSS

0.8%

p52

KEV

—

Exploit Today

0-100

Publicado: 26 mar 2026 · Última mod.: 16 jul 2026 · CWE-400 · CWE-1333

EPSS · 30d

0.8%EPSS · 30 días0.8%

2026-06-302026-07-16

Descripción técnica

Impact: A bad regular expression is generated any time you have multiple sequential optional groups (curly brace syntax), such as `{a}{b}{c}:z`. The generated regex grows exponentially with the number of groups, causing denial of service. Patches: Fixed in version 8.4.0. Workarounds: Limit the number of sequential optional groups in route patterns. Avoid passing user-controlled input as route patterns.

Referencias oficiales

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