What is CVE-2024-10549?

CVE-2024-10549 is a high-severity vulnerability in H2o, classified under Inefficient Regular Expression Complexity. CVSS score: 7.5/10. Published 2025-03-20.

How severe is CVE-2024-10549?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in H2o

CVE-2024-10549

A vulnerability in the `/3/Parse` endpoint of h2oai/h2o-3 version 3.46.0.1 allows for a denial of service (DoS) attack. The endpoint uses a user-specified string to construct a regular expression, which is then applied to another user-specified string. By sending multiple simultaneous requests, an attacker can exhaust all available threads, leading to a complete denial of service.

Vulnerability class: ReDoS (Regular Expression Denial of Service)

EPSS: 0.006 (44.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

H2o — versions 3.46.0.1
H2oai H2oai/h2o-3 — versions unspecified

Weakness classification (CWE)

CWE-1333 — Inefficient Regular Expression Complexity

References

security@huntr.dev (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2024-10549?: CVE-2024-10549 is a high-severity vulnerability in H2o, classified under Inefficient Regular Expression Complexity. CVSS score: 7.5/10. Published 2025-03-20.
How severe is CVE-2024-10549?: High severity. CVSS v3 base score is 7.5 out of 10.