Is CVE-2026-4926 actively exploited?

No active exploitation of CVE-2026-4926 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-4926 be exploited remotely?

Yes. CVE-2026-4926 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-4926?

CVE-2026-4926 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2026-4926

HIGH

CVE-2026-4926

CWE-400Published: March 26, 2026· Updated: Mar 30, 2026

7.5

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:12.1th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-4926 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.