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THREAT OPS › Threat News › [NVD] CVE-2026-4926 (HIGH 7.5) — 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. Work

[NVD] CVE-2026-4926 (HIGH 7.5) — 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. Work

lownvdPublished 2026-03-26

CVE-2026-4926 CVSS: 7.5 HIGH Published: 2026-03-26T19:17:08.387

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 group

Indicators of compromise

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-4926