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76 vulnerabilities found for h2o by h2o
CVE-2026-54340 (GCVE-0-2026-54340)
Vulnerability from nvd – Published: 2026-07-16 23:29 – Updated: 2026-07-17 18:06
VLAI
EPSS
VEX
Title
h2o has HTTP/2 state amplification
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 9265bdd, there is an HTTP/2 state amplification issue that combines HPACK decompression amplification with Slowloris-style stream stalling. Amplified decoded header state can be retained by stalled HTTP/2 streams, and depending on the configuration, additional limits are needed to bound decoded header state and prevent attack. This issue has been fixed by commit 9265bdd.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-17 15:26 UTC
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/h2o/h2o/security/advisories/GH… | x_refsource_CONFIRM |
| https://github.com/h2o/h2o/commit/9265bdd9a996ed9… | x_refsource_MISC |
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CVE-2026-44453 (GCVE-0-2026-44453)
Vulnerability from nvd – Published: 2026-07-16 23:04 – Updated: 2026-07-17 14:29
VLAI
EPSS
VEX
Title
h2o is vulnerable to musl libc stack overflow
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 6b5370d, h2o is vulnerable to a Denial of Service attack when calling alloca under certain conditions. When serving static files, h2o builds the file path on stack, by calling alloca. The maximum size of the memory allocated using alloca can be as huge as ~600KB, which exceeds the default pthread stack size used by musl libc (128KB). If the amount of memory allocated by alloca exceeds the stack size, the h2o server crashes with a segmentation fault, while it tries to touch the guard page. This issue has been fixed by commit 6b5370d.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-17 14:29 UTC
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/h2o/h2o/security/advisories/GH… | x_refsource_CONFIRM |
| https://github.com/h2o/h2o/commit/6b5370d9d09fcf8… | x_refsource_MISC |
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CVE-2026-44452 (GCVE-0-2026-44452)
Vulnerability from nvd – Published: 2026-07-16 22:54 – Updated: 2026-07-17 14:03
VLAI
EPSS
VEX
Title
h2o is vulnerable to heap overrun
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 8dc37cb, when h2o receives a ClientHello message over TLS or QUIC and it contains a zero-length SNI extension, the h2o server runs over the zero-length hostname while trying to copy the hostname, assuming that it is NULL-terminated. This is a potential denial-of-service attack vector in sense that it might trigger segmentation violation. This issue has been fixed by commit 8dc37cb.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-17 14:03 UTC
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/h2o/h2o/security/advisories/GH… | x_refsource_CONFIRM |
| https://github.com/h2o/h2o/commit/8dc37cb1e6171f7… | x_refsource_MISC |
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CVE-2026-55213 (GCVE-0-2026-55213)
Vulnerability from nvd – Published: 2026-07-10 20:49 – Updated: 2026-07-13 14:14
VLAI
EPSS
VEX
Title
h2o: musl libc stack overflow (QPACK)
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit edd7a120bfc4af11ac0cbebce2a43cc1f93f9af1, when h2o processes a QPACK instruction sent from the peer over HTTP/3, lib/http3/qpack.c might allocate an on-stack buffer as large as approximately 800 KB by calling alloca, which exceeds the default pthread stack size used by musl libc and causes the h2o server to crash with a segmentation fault while touching the guard page. This issue is fixed in commit edd7a120bfc4af11ac0cbebce2a43cc1f93f9af1.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-13 14:14 UTC
CWE
- CWE-789 - Memory Allocation with Excessive Size Value
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/h2o/h2o/security/advisories/GH… | x_refsource_CONFIRM |
| https://github.com/h2o/h2o/commit/edd7a120bfc4af1… | x_refsource_MISC |
Impacted products
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CVE-2026-8752 (GCVE-0-2026-8752)
Vulnerability from nvd – Published: 2026-05-17 11:45 – Updated: 2026-05-18 14:39
VLAI
EPSS
VEX
Title
h2oai h2o-3 Rapids setproperty Primitive AstSetProperty.java exec access control
Summary
A weakness has been identified in h2oai h2o-3 up to 7402. This vulnerability affects the function exec of the file h2o-core/src/main/java/water/rapids/ast/prims/misc/AstSetProperty.java of the component Rapids setproperty Primitive Handler. Executing a manipulation can lead to improper access controls. The attack may be performed from remote. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-18 14:38 UTC
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/364379 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/364379/cti | signaturepermissions-required |
| https://vuldb.com/submit/810108 | third-party-advisory |
| https://vulnplus-note.wetolink.com/share/pyVa0GWPuAZE | exploit |
Impacted products
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CVE-2026-8751 (GCVE-0-2026-8751)
Vulnerability from nvd – Published: 2026-05-17 11:30 – Updated: 2026-05-18 14:19
VLAI
EPSS
VEX
Title
h2oai h2o-3 JAR Model.java importBinaryModel deserialization
Summary
A security flaw has been discovered in h2oai h2o-3 up to 7402. This affects the function importBinaryModel of the file h2o-core/src/main/java/hex/Model.java of the component JAR Handler. Performing a manipulation results in deserialization. The attack is possible to be carried out remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-18 14:19 UTC
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/364378 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/364378/cti | signaturepermissions-required |
| https://vuldb.com/submit/810107 | third-party-advisory |
| https://vulnplus-note.wetolink.com/share/b5nsQg6EcsBS | exploit |
Impacted products
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CVE-2026-8750 (GCVE-0-2026-8750)
Vulnerability from nvd – Published: 2026-05-17 10:45 – Updated: 2026-05-18 17:53
VLAI
EPSS
VEX
Title
h2oai h2o-3 ImportFile API PersistNFS.java importFiles information disclosure
Summary
A vulnerability was identified in h2oai h2o-3 up to 7402. Affected by this issue is the function importFiles of the file h2o-core/src/main/java/water/persist/PersistNFS.java of the component ImportFile API. Such manipulation leads to information disclosure. The attack can be executed remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-18 17:11 UTC
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/364377 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/364377/cti | signaturepermissions-required |
| https://vuldb.com/submit/810105 | third-party-advisory |
| https://vulnplus-note.wetolink.com/share/wWjmsfKHRJi3 | exploit |
Impacted products
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CVE-2026-3960 (GCVE-0-2026-3960)
Vulnerability from nvd – Published: 2026-04-23 08:47 – Updated: 2026-04-23 12:29
VLAI
EPSS
VEX
Title
Remote Code Execution in h2oai/h2o-3
Summary
A critical remote code execution vulnerability exists in the unauthenticated REST API endpoint /99/ImportSQLTable in H2O-3 version 3.46.0.9 and prior. The vulnerability arises due to insufficient security controls in the parameter blacklist mechanism, which only targets MySQL JDBC driver-specific dangerous parameters. An attacker can bypass these controls by switching the JDBC URL protocol to jdbc:postgresql: and exploiting PostgreSQL JDBC driver-specific parameters such as socketFactory and socketFactoryArg. This allows unauthenticated attackers to execute arbitrary code on the H2O-3 server with the privileges of the H2O-3 process. The issue is resolved in version 3.46.0.10.
Severity
5.9 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-23 12:25 UTC
CWE
- CWE-94 - Improper Control of Generation of Code
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| h2oai | h2oai/h2o-3 |
Affected:
unspecified , < 3.46.0.10
(custom)
|
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CVE-2025-10769 (GCVE-0-2025-10769)
Vulnerability from nvd – Published: 2025-09-21 09:33 – Updated: 2025-09-22 17:25
VLAI
EPSS
VEX
Title
h2oai h2o-3 H2 JDBC Driver ImportSQLTable deserialization
Summary
A vulnerability has been found in h2oai h2o-3 up to 3.46.08. This affects an unknown function of the file /99/ImportSQLTable of the component H2 JDBC Driver. Such manipulation of the argument connection_url leads to deserialization. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-09-22 17:25 UTC
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://vuldb.com/?id.325125 | vdb-entrytechnical-description |
| https://vuldb.com/?ctiid.325125 | signaturepermissions-required |
| https://vuldb.com/?submit.649728 | third-party-advisory |
| https://vuldb.com/?submit.649793 | third-party-advisory |
| https://github.com/ez-lbz/poc/issues/51 | exploitissue-tracking |
| https://github.com/ez-lbz/poc/issues/51#issue-339… | exploitissue-tracking |
| https://huntr.com/bounties/4066ce21-7148-44f5-833… | related |
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CVE-2025-10768 (GCVE-0-2025-10768)
Vulnerability from nvd – Published: 2025-09-21 09:33 – Updated: 2025-09-22 17:24
VLAI
EPSS
VEX
Title
h2oai h2o-3 IBMDB2 JDBC Driver ImportSQLTable deserialization
Summary
A flaw has been found in h2oai h2o-3 up to 3.46.08. The impacted element is an unknown function of the file /99/ImportSQLTable of the component IBMDB2 JDBC Driver. This manipulation of the argument connection_url causes deserialization. The attack may be initiated remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-09-22 17:24 UTC
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://vuldb.com/?id.325124 | vdb-entrytechnical-description |
| https://vuldb.com/?ctiid.325124 | signaturepermissions-required |
| https://vuldb.com/?submit.649508 | third-party-advisory |
| https://github.com/ez-lbz/poc/issues/50 | exploitissue-tracking |
| https://github.com/ez-lbz/poc/issues/50#issue-338… | exploitissue-tracking |
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CVE-2025-6544 (GCVE-0-2025-6544)
Vulnerability from nvd – Published: 2025-09-21 09:00 – Updated: 2025-09-22 17:23
VLAI
EPSS
VEX
Title
Deserialization Vulnerability in h2oai/h2o-3
Summary
A deserialization vulnerability exists in h2oai/h2o-3 versions <= 3.46.0.8, allowing attackers to read arbitrary system files and execute arbitrary code. The vulnerability arises from improper handling of JDBC connection parameters, which can be exploited by bypassing regular expression checks and using double URL encoding. This issue impacts all users of the affected versions.
Severity
9.8 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-09-22 17:23 UTC
CWE
- CWE-502 - Deserialization of Untrusted Data
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| h2oai | h2oai/h2o-3 |
Affected:
unspecified , < 3.46.8
(custom)
|
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CVE-2024-8616 (GCVE-0-2024-8616)
Vulnerability from nvd – Published: 2025-03-20 10:10 – Updated: 2025-03-20 18:23
VLAI
EPSS
VEX
Title
Arbitrary File Overwrite in h2oai/h2o-3
Summary
In h2oai/h2o-3 version 3.46.0, the `/99/Models/{name}/json` endpoint allows for arbitrary file overwrite on the target server. The vulnerability arises from the `exportModelDetails` function in `ModelsHandler.java`, where the user-controllable `mexport.dir` parameter is used to specify the file path for writing model details. This can lead to overwriting files at arbitrary locations on the host system.
Severity
8.2 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-03-20 17:51 UTC
CWE
- CWE-73 - External Control of File Name or Path
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| h2oai | h2oai/h2o-3 |
Affected:
unspecified , ≤ latest
(custom)
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CVE-2024-8062 (GCVE-0-2024-8062)
Vulnerability from nvd – Published: 2025-03-20 10:11 – Updated: 2025-03-20 15:23
VLAI
EPSS
VEX
Title
Denial of Service in h2oai/h2o-3
Summary
A vulnerability in the typeahead endpoint of h2oai/h2o-3 version 3.46.0 allows for a denial of service. The endpoint performs a `HEAD` request to verify the existence of a specified resource without setting a timeout. An attacker can exploit this by sending multiple requests to an attacker-controlled server that hangs, causing the application to block and become unresponsive to other requests.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-03-20 15:23 UTC
CWE
- CWE-1088 - Synchronous Access of Remote Resource without Timeout
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| h2oai | h2oai/h2o-3 |
Affected:
unspecified , ≤ latest
(custom)
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CVE-2024-7768 (GCVE-0-2024-7768)
Vulnerability from nvd – Published: 2025-03-20 10:10 – Updated: 2025-10-15 12:49
VLAI
EPSS
VEX
Title
Denial of Service in h2oai/h2o-3
Summary
A vulnerability in the `/3/ImportFiles` endpoint of h2oai/h2o-3 version 3.46.1 allows an attacker to cause a denial of service. The endpoint takes a single GET parameter, `path`, which can be recursively set to reference itself. This leads the server to repeatedly call its own endpoint, eventually filling up the request queue and leaving the server unable to handle other requests.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-03-20 17:50 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| h2oai | h2oai/h2o-3 |
Affected:
unspecified , ≤ latest
(custom)
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CVE-2024-7765 (GCVE-0-2024-7765)
Vulnerability from nvd – Published: 2025-03-20 10:08 – Updated: 2025-03-20 14:29
VLAI
EPSS
VEX
Title
Denial of Service in h2oai/h2o-3
Summary
In h2oai/h2o-3 version 3.46.0.2, a vulnerability exists where uploading and repeatedly parsing a large GZIP file can cause a denial of service. The server becomes unresponsive due to memory exhaustion and a large number of concurrent slow-running jobs. This issue arises from the improper handling of highly compressed data, leading to significant data amplification.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-03-20 14:29 UTC
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| h2oai | h2oai/h2o-3 |
Affected:
unspecified , ≤ latest
(custom)
|
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CVE-2024-6863 (GCVE-0-2024-6863)
Vulnerability from nvd – Published: 2025-03-20 10:10 – Updated: 2025-10-15 12:50
VLAI
EPSS
VEX
Title
Encryption of Arbitrary Files with Attacker-Controlled Key in h2oai/h2o-3
Summary
In h2oai/h2o-3 version 3.46.0, an endpoint exposing a custom EncryptionTool allows an attacker to encrypt any files on the target server with a key of their choosing. The chosen key can also be overwritten, resulting in ransomware-like behavior. This vulnerability makes it possible for an attacker to encrypt arbitrary files with keys of their choice, making it exceedingly difficult for the target to recover the keys needed for decryption.
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-03-20 17:51 UTC
CWE
- CWE-749 - Exposed Dangerous Method or Function
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| h2oai | h2oai/h2o-3 |
Affected:
unspecified , ≤ latest
(custom)
|
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CVE-2024-6854 (GCVE-0-2024-6854)
Vulnerability from nvd – Published: 2025-03-20 10:09 – Updated: 2025-03-20 18:32
VLAI
EPSS
VEX
Title
Arbitrary File Overwrite in h2oai/h2o-3
Summary
In h2oai/h2o-3 version 3.46.0, the endpoint for exporting models does not restrict the export location, allowing an attacker to export a model to any file in the server's file structure, thereby overwriting it. This vulnerability can be exploited to overwrite any file on the target server with a trained model file, although the content of the overwrite is not controllable by the attacker.
Severity
7.1 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-03-20 17:49 UTC
CWE
- CWE-36 - Absolute Path Traversal
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| h2oai | h2oai/h2o-3 |
Affected:
unspecified , ≤ latest
(custom)
|
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CVE-2024-10572 (GCVE-0-2024-10572)
Vulnerability from nvd – Published: 2025-03-20 10:09 – Updated: 2025-10-15 12:49
VLAI
EPSS
VEX
Title
Denial of Service and Arbitrary File Write in h2oai/h2o-3
Summary
In h2oai/h2o-3 version 3.46.0.1, the `run_tool` command exposes classes in the `water.tools` package through the `ast` parser. This includes the `XGBoostLibExtractTool` class, which can be exploited to shut down the server and write large files to arbitrary directories, leading to a denial of service.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-03-20 17:53 UTC
CWE
- CWE-94 - Improper Control of Generation of Code
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| h2oai | h2oai/h2o-3 |
Affected:
unspecified , ≤ latest
(custom)
|
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CVE-2024-10553 (GCVE-0-2024-10553)
Vulnerability from nvd – Published: 2025-03-20 10:09 – Updated: 2025-03-20 18:58
VLAI
EPSS
VEX
Title
Jdbc Deserialization in h2oai/h2o-3
Summary
A vulnerability in the h2oai/h2o-3 REST API versions 3.46.0.4 allows unauthenticated remote attackers to execute arbitrary code via deserialization of untrusted data. The vulnerability exists in the endpoints POST /99/ImportSQLTable and POST /3/SaveToHiveTable, where user-controlled JDBC URLs are passed to DriverManager.getConnection, leading to deserialization if a MySQL or PostgreSQL driver is available in the classpath. This issue is fixed in version 3.47.0.
Severity
9.8 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-03-20 17:51 UTC
CWE
- CWE-502 - Deserialization of Untrusted Data
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| h2oai | h2oai/h2o-3 |
Affected:
unspecified , < 3.47.0
(custom)
|
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CVE-2026-54340 (GCVE-0-2026-54340)
Vulnerability from cvelistv5 – Published: 2026-07-16 23:29 – Updated: 2026-07-17 18:06
VLAI
EPSS
VEX
Title
h2o has HTTP/2 state amplification
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 9265bdd, there is an HTTP/2 state amplification issue that combines HPACK decompression amplification with Slowloris-style stream stalling. Amplified decoded header state can be retained by stalled HTTP/2 streams, and depending on the configuration, additional limits are needed to bound decoded header state and prevent attack. This issue has been fixed by commit 9265bdd.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-17 15:26 UTC
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/h2o/h2o/security/advisories/GH… | x_refsource_CONFIRM |
| https://github.com/h2o/h2o/commit/9265bdd9a996ed9… | x_refsource_MISC |
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CVE-2026-44453 (GCVE-0-2026-44453)
Vulnerability from cvelistv5 – Published: 2026-07-16 23:04 – Updated: 2026-07-17 14:29
VLAI
EPSS
VEX
Title
h2o is vulnerable to musl libc stack overflow
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 6b5370d, h2o is vulnerable to a Denial of Service attack when calling alloca under certain conditions. When serving static files, h2o builds the file path on stack, by calling alloca. The maximum size of the memory allocated using alloca can be as huge as ~600KB, which exceeds the default pthread stack size used by musl libc (128KB). If the amount of memory allocated by alloca exceeds the stack size, the h2o server crashes with a segmentation fault, while it tries to touch the guard page. This issue has been fixed by commit 6b5370d.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-17 14:29 UTC
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/h2o/h2o/security/advisories/GH… | x_refsource_CONFIRM |
| https://github.com/h2o/h2o/commit/6b5370d9d09fcf8… | x_refsource_MISC |
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CVE-2026-44452 (GCVE-0-2026-44452)
Vulnerability from cvelistv5 – Published: 2026-07-16 22:54 – Updated: 2026-07-17 14:03
VLAI
EPSS
VEX
Title
h2o is vulnerable to heap overrun
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 8dc37cb, when h2o receives a ClientHello message over TLS or QUIC and it contains a zero-length SNI extension, the h2o server runs over the zero-length hostname while trying to copy the hostname, assuming that it is NULL-terminated. This is a potential denial-of-service attack vector in sense that it might trigger segmentation violation. This issue has been fixed by commit 8dc37cb.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-17 14:03 UTC
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/h2o/h2o/security/advisories/GH… | x_refsource_CONFIRM |
| https://github.com/h2o/h2o/commit/8dc37cb1e6171f7… | x_refsource_MISC |
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CVE-2026-55213 (GCVE-0-2026-55213)
Vulnerability from cvelistv5 – Published: 2026-07-10 20:49 – Updated: 2026-07-13 14:14
VLAI
EPSS
VEX
Title
h2o: musl libc stack overflow (QPACK)
Summary
h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit edd7a120bfc4af11ac0cbebce2a43cc1f93f9af1, when h2o processes a QPACK instruction sent from the peer over HTTP/3, lib/http3/qpack.c might allocate an on-stack buffer as large as approximately 800 KB by calling alloca, which exceeds the default pthread stack size used by musl libc and causes the h2o server to crash with a segmentation fault while touching the guard page. This issue is fixed in commit edd7a120bfc4af11ac0cbebce2a43cc1f93f9af1.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-13 14:14 UTC
CWE
- CWE-789 - Memory Allocation with Excessive Size Value
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/h2o/h2o/security/advisories/GH… | x_refsource_CONFIRM |
| https://github.com/h2o/h2o/commit/edd7a120bfc4af1… | x_refsource_MISC |
Impacted products
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CVE-2026-8752 (GCVE-0-2026-8752)
Vulnerability from cvelistv5 – Published: 2026-05-17 11:45 – Updated: 2026-05-18 14:39
VLAI
EPSS
VEX
Title
h2oai h2o-3 Rapids setproperty Primitive AstSetProperty.java exec access control
Summary
A weakness has been identified in h2oai h2o-3 up to 7402. This vulnerability affects the function exec of the file h2o-core/src/main/java/water/rapids/ast/prims/misc/AstSetProperty.java of the component Rapids setproperty Primitive Handler. Executing a manipulation can lead to improper access controls. The attack may be performed from remote. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-18 14:38 UTC
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/364379 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/364379/cti | signaturepermissions-required |
| https://vuldb.com/submit/810108 | third-party-advisory |
| https://vulnplus-note.wetolink.com/share/pyVa0GWPuAZE | exploit |
Impacted products
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CVE-2026-8751 (GCVE-0-2026-8751)
Vulnerability from cvelistv5 – Published: 2026-05-17 11:30 – Updated: 2026-05-18 14:19
VLAI
EPSS
VEX
Title
h2oai h2o-3 JAR Model.java importBinaryModel deserialization
Summary
A security flaw has been discovered in h2oai h2o-3 up to 7402. This affects the function importBinaryModel of the file h2o-core/src/main/java/hex/Model.java of the component JAR Handler. Performing a manipulation results in deserialization. The attack is possible to be carried out remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-18 14:19 UTC
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/364378 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/364378/cti | signaturepermissions-required |
| https://vuldb.com/submit/810107 | third-party-advisory |
| https://vulnplus-note.wetolink.com/share/b5nsQg6EcsBS | exploit |
Impacted products
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CVE-2026-8750 (GCVE-0-2026-8750)
Vulnerability from cvelistv5 – Published: 2026-05-17 10:45 – Updated: 2026-05-18 17:53
VLAI
EPSS
VEX
Title
h2oai h2o-3 ImportFile API PersistNFS.java importFiles information disclosure
Summary
A vulnerability was identified in h2oai h2o-3 up to 7402. Affected by this issue is the function importFiles of the file h2o-core/src/main/java/water/persist/PersistNFS.java of the component ImportFile API. Such manipulation leads to information disclosure. The attack can be executed remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-18 17:11 UTC
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/364377 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/364377/cti | signaturepermissions-required |
| https://vuldb.com/submit/810105 | third-party-advisory |
| https://vulnplus-note.wetolink.com/share/wWjmsfKHRJi3 | exploit |
Impacted products
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CVE-2026-3960 (GCVE-0-2026-3960)
Vulnerability from cvelistv5 – Published: 2026-04-23 08:47 – Updated: 2026-04-23 12:29
VLAI
EPSS
VEX
Title
Remote Code Execution in h2oai/h2o-3
Summary
A critical remote code execution vulnerability exists in the unauthenticated REST API endpoint /99/ImportSQLTable in H2O-3 version 3.46.0.9 and prior. The vulnerability arises due to insufficient security controls in the parameter blacklist mechanism, which only targets MySQL JDBC driver-specific dangerous parameters. An attacker can bypass these controls by switching the JDBC URL protocol to jdbc:postgresql: and exploiting PostgreSQL JDBC driver-specific parameters such as socketFactory and socketFactoryArg. This allows unauthenticated attackers to execute arbitrary code on the H2O-3 server with the privileges of the H2O-3 process. The issue is resolved in version 3.46.0.10.
Severity
5.9 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-23 12:25 UTC
CWE
- CWE-94 - Improper Control of Generation of Code
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| h2oai | h2oai/h2o-3 |
Affected:
unspecified , < 3.46.0.10
(custom)
|
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CVE-2025-10769 (GCVE-0-2025-10769)
Vulnerability from cvelistv5 – Published: 2025-09-21 09:33 – Updated: 2025-09-22 17:25
VLAI
EPSS
VEX
Title
h2oai h2o-3 H2 JDBC Driver ImportSQLTable deserialization
Summary
A vulnerability has been found in h2oai h2o-3 up to 3.46.08. This affects an unknown function of the file /99/ImportSQLTable of the component H2 JDBC Driver. Such manipulation of the argument connection_url leads to deserialization. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-09-22 17:25 UTC
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://vuldb.com/?id.325125 | vdb-entrytechnical-description |
| https://vuldb.com/?ctiid.325125 | signaturepermissions-required |
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| https://vuldb.com/?submit.649793 | third-party-advisory |
| https://github.com/ez-lbz/poc/issues/51 | exploitissue-tracking |
| https://github.com/ez-lbz/poc/issues/51#issue-339… | exploitissue-tracking |
| https://huntr.com/bounties/4066ce21-7148-44f5-833… | related |
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CVE-2025-10768 (GCVE-0-2025-10768)
Vulnerability from cvelistv5 – Published: 2025-09-21 09:33 – Updated: 2025-09-22 17:24
VLAI
EPSS
VEX
Title
h2oai h2o-3 IBMDB2 JDBC Driver ImportSQLTable deserialization
Summary
A flaw has been found in h2oai h2o-3 up to 3.46.08. The impacted element is an unknown function of the file /99/ImportSQLTable of the component IBMDB2 JDBC Driver. This manipulation of the argument connection_url causes deserialization. The attack may be initiated remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-09-22 17:24 UTC
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://vuldb.com/?id.325124 | vdb-entrytechnical-description |
| https://vuldb.com/?ctiid.325124 | signaturepermissions-required |
| https://vuldb.com/?submit.649508 | third-party-advisory |
| https://github.com/ez-lbz/poc/issues/50 | exploitissue-tracking |
| https://github.com/ez-lbz/poc/issues/50#issue-338… | exploitissue-tracking |
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CVE-2025-6544 (GCVE-0-2025-6544)
Vulnerability from cvelistv5 – Published: 2025-09-21 09:00 – Updated: 2025-09-22 17:23
VLAI
EPSS
VEX
Title
Deserialization Vulnerability in h2oai/h2o-3
Summary
A deserialization vulnerability exists in h2oai/h2o-3 versions <= 3.46.0.8, allowing attackers to read arbitrary system files and execute arbitrary code. The vulnerability arises from improper handling of JDBC connection parameters, which can be exploited by bypassing regular expression checks and using double URL encoding. This issue impacts all users of the affected versions.
Severity
9.8 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-09-22 17:23 UTC
CWE
- CWE-502 - Deserialization of Untrusted Data
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| h2oai | h2oai/h2o-3 |
Affected:
unspecified , < 3.46.8
(custom)
|
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