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CVE-2024-10549

Denial of Service by ReDOS in h2oai/h2o-3

7.5 High

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.64%Up 0.6 points since Mar 20, 2025
90%50%10%1%

What each source reports

CVE List Score used 7.5

Denial of Service by ReDOS in h2oai/h2o-3

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.

Record
CVE-2024-10549
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-1333
Updated
2026-11-02
EUVDEUVD-2025-7097 7.5

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.

Record
EUVD-2025-7097
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-wwr9-4gmr-xvq9 7.5

H2O Vulnerable to Denial of Service (DoS) via `/3/Parse` Endpoint

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.

Record
GHSA-wwr9-4gmr-xvq9
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-400, CWE-1333
Updated
2026-11-02
NVD 7.5

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.

Record
CVE-2024-10549
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-1333
Updated
2026-11-02
OSV 7.5

Denial of Service by ReDOS in h2oai/h2o-3

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.

Record
CVE-2024-10549
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-1333
Updated
2026-11-02
OSVGHSA-wwr9-4gmr-xvq9 7.5

H2O Vulnerable to Denial of Service (DoS) via `/3/Parse` Endpoint

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.

Record
GHSA-wwr9-4gmr-xvq9
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-1333, CWE-400
Updated
2026-11-02
OSVPYSEC-2026-1445 7.5

H2O Vulnerable to Denial of Service (DoS) via `/3/Parse` Endpoint

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.

Record
PYSEC-2026-1445
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
h2o
PyPI
 3.30.0.7 to 3.46.0.1 None known
ai.h2o:h2o-core
Maven
 3.30.0.7 to 3.46.0.1 None known
h2o
PyPI
 3.30.0.7 to 3.46.0.1, plus listed versions
3.30.1.13.30.1.23.30.1.33.32.0.23.32.0.3
Show 35 moreShow less
3.32.0.43.32.0.53.32.1.13.32.1.23.32.1.33.32.1.43.32.1.53.32.1.63.32.1.73.34.0.33.34.0.73.34.0.83.36.0.23.36.0.33.36.0.43.36.1.13.36.1.23.36.1.33.36.1.43.36.1.53.38.0.13.38.0.23.38.0.33.38.0.43.40.0.13.40.0.23.40.0.33.40.0.43.42.0.13.42.0.23.42.0.33.42.0.43.44.0.13.44.0.23.44.0.3
 None known
ai.h2o:h2o-core
Maven
 3.30.0.7 to 3.46.0.1, plus listed versions
3.30.1.13.30.1.23.30.1.33.32.0.13.32.0.2
Show 42 moreShow less
3.32.0.33.32.0.43.32.0.53.32.1.13.32.1.23.32.1.33.32.1.43.32.1.53.32.1.63.32.1.73.34.0.13.34.0.33.34.0.43.34.0.53.34.0.63.34.0.73.34.0.83.35.0.23.36.0.13.36.0.23.36.0.33.36.0.43.36.1.13.36.1.23.36.1.33.36.1.43.36.1.53.38.0.13.38.0.23.38.0.33.38.0.43.40.0.13.40.0.23.40.0.33.40.0.43.42.0.13.42.0.23.42.0.33.42.0.43.44.0.13.44.0.23.44.0.3
 None known

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2024-10549 is a high vulnerability (CVSS 7.5) in H2o, published March 20, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.64%, the 50th percentile. No source names a fixed version.

References

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