Vulnerability · Published Mar 20, 2025 · Assigned by @huntr_ai
CVE-2024-10549Denial of Service by ReDOS in h2oai/h2o-3
High 7.5
In plain English
A high-severity regular-expression denial of service in h2oai/h2o-3 from h2oai. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 51% of all known vulnerabilities).
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Maven | ai.h2o:h2o-core | no fix listed | GHSA-wwr9-4gmr-xvq9 |
| PyPI | h2o | no fix listed | GHSA-wwr9-4gmr-xvq9 |
| PyPI | h2o | no fix listed | PYSEC-2026-1445 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| h2oai | h2oai/h2o-3 | unspecified – through latest |
Weakness: CWE-1333 · Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H