CVE-2024-10549: Denial of Service by ReDOS in h2oai/h2o-3
Vulnerability summary
CVE-2024-10549 is a high (CVSS 7.5) vulnerability in h2o. EPSS estimates a 0.64% chance of exploitation in the next 30 days, higher than 50.5% of scored vulnerabilities. 1 public exploit is recorded.
Public exploit (reference, Date unknown)
Source freshness unavailable
How is this decided?Timeline
- 20-03-2025PublishedVulnerability first disclosed.
- 15-10-2025Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · PypiEcosystem advisory · calculated7.5HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · MavenEcosystem advisory · calculated7.5HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST7.5HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.64%
Chance of exploitation in the next 30 days
Percentile
51%
Versus all other CVEs
30-day change
Increase +0.01 pp
From 0.62% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundExploit Reference (huntr.com)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ai.h2o1 product
- h2o-core≥ 3.30.0.7, ≤ 3.46.0.1
H2o1 product
- h2o3.46.0.1
H2oai1 product
- h2oai/h2o-3≥ unspecified, ≤ latest
PyPI1 product
- h2o≥ 3.30.0.7, ≤ 3.46.0.1
4 vendors · 4 products
References
6 links
- github.com/h2oai/h2o-3PACKAGE
- pypi.org/project/h2oPACKAGE