Medium
horizon — security advisory
A JEXL expression sandbox bypass exists in multiple versions of OpenNMS Meridian and Horizon. A low-privileged authenticated user can submit a crafted expression to the Measurements REST API that escapes the sandbox and loads arbitrary Java classes on the server. This can potentially allow an attacker to gain access to confidential information and compromise integrity. The solution is to upgrade to Meridian 2024.3.12, 2025.0.9 and Horizon 36.0.3 or newer. Meridian and Horizon installation instructions state that they are intended for installation within an organization's private networks and should not be directly accessible from the Internet.
- Products
- horizon
- Affected versions
- 2:8.0.0-0ubuntu2, 2:9.0.0-0ubuntu1, 2:9.0.0-0ubuntu2, 2:9.0.0-0ubuntu2.16.04.1, 2:9.0.0~b1-0ubuntu1, 2:9.0.0~b1-0ubuntu2, 2:9.0.0~b2-0ubuntu1, 2:9.0.0~b3-0ubuntu1, 2:9.0.0~rc1-0ubuntu1, 2:9.0.1-0ubuntu2, 2:9.1.0-0ubuntu1, 2:9.1.1-0ubuntu1, 2:9.1.2-0ubuntu1, 2:9.1.2-0ubuntu2, 2:9.1.2-0ubuntu3, 2:9.1.2-0ubuntu5, 2:9.1.2-0ubuntu5.2, 3:12.0.0-0ubuntu2.1, 3:12.0.0-0ubuntu3, 3:13.0.0-0ubuntu1, 3:13.0.0-0ubuntu1.1, 3:13.0.0~b1-0ubuntu1, 3:13.0.0~b1-0ubuntu2, 3:13.0.1-0ubuntu1, 3:13.0.1-0ubuntu2, 3:13.0.1-0ubuntu3, 3:13.0.1-0ubuntu4, 3:13.0.1-0ubuntu5, 3:13.0.1-0ubuntu6, 3:13.0.2-0ubuntu1, 3:13.0.2-0ubuntu2, 3:13.0.2-0ubuntu3, 3:13.0.3-0ubuntu1, 3:13.0.3-0ubuntu2, 3:16.0.0-0ubuntu1, 3:17.0.0~b1~git2019121712.f7313b74c-0ubuntu1, 3:18.0.1~git2020021409.bb959361b-0ubuntu2, 3:18.0.1~git2020021409.bb959361b-0ubuntu3, 3:18.2.1~git2020032709.2c4470272-0ubuntu1, 3:18.2.1~git2020041013.754804667-0ubuntu1, 3:18.2.1~git2020041013.754804667-0ubuntu2, 3:18.2.1~git2020041013.754804667-0ubuntu3, 3:18.3.2-0ubuntu0.20.04.1, 3:18.3.2-0ubuntu0.20.04.2, 3:18.3.2-0ubuntu0.20.04.4, 3:18.3.3-0ubuntu1, 3:18.3.4-0ubuntu1, 3:18.3.5-0ubuntu1, 3:18.3.5-0ubuntu2, 3:18.3.5-0ubuntu2.1, 3:18.3.5-0ubuntu2.2, 3:18.3.5-0ubuntu2.3, 3:18.3.5-0ubuntu2.3+esm1, 4:20.1.0-0ubuntu1, 4:20.2.0+git2021120911.fc1012628-0ubuntu1, 4:20.2.0+git2022011216.8fe5bbc8d-0ubuntu1, 4:21.0.0+git2022030313.dd9e4c82b-0ubuntu2, 4:22.1.0-0ubuntu1, 4:22.1.0-0ubuntu2, 4:22.1.0-0ubuntu2.1, 4:22.1.1-0ubuntu1, 4:22.1.1-0ubuntu1.1, 4:23.3.0-0ubuntu1, 4:23.3.0-0ubuntu2, 4:23.4.0+git2024011916.a77818d7-0ubuntu1, 4:24.0.0-0ubuntu1, 4:24.0.0-0ubuntu1.1, 4:24.0.0-0ubuntu1.2, 4:24.0.0-0ubuntu1.3, 4:24.0.1-0ubuntu0.24.04.1, 4:24.0.1-0ubuntu0.24.04.2, 4:25.5.1+git2026012819.479212220-0ubuntu1, 4:25.5.1-0ubuntu1, 4:25.5.1-0ubuntu2, 4:25.7.1-0ubuntu1, 4:26.0.0-0ubuntu1, 4:27.0.0-0ubuntu1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-19135
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:55 UTC · Revision 1
Source evidence
A JEXL expression sandbox bypass exists in multiple versions of OpenNMS Meridian and Horizon. A low-privileged authenticated user can submit a crafted expression to the Measurements REST API that escapes the sandbox and loads arbitrary Java classes on the server. This can potentially allow an attacker to gain access to confidential information and compromise integrity. The solution is to upgrade to Meridian 2024.3.12, 2025.0.9 and Horizon 36.0.3 or newer. Meridian and Horizon installation instructions state that they are intended for installation within an organization's private networks and should not be directly accessible from the Internet.
osv:UBUNTU-CVE-2026-19135
horizon
Fixed versions: Not specified
horizon
Fixed versions: Not specified
horizon
Fixed versions: Not specified
horizon
Fixed versions: Not specified
horizon
Fixed versions: Not specified
horizon
Fixed versions: Not specified
horizon
Fixed versions: Not specified
Complete source record
{
"id": "121774103fbafc1c8d20ac0b211012d7950e082444764da6943b085d58d4f2b1",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-19135",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-19135",
"summary": "A JEXL expression sandbox bypass exists in multiple versions of OpenNMS Meridian and Horizon. A low-privileged authenticated user can submit a crafted expression to the Measurements REST API that escapes the sandbox and loads arbitrary Java classes on the server. This can potentially allow an attacker to gain access to confidential information and compromise integrity. The solution is to upgrade to Meridian 2024.3.12, 2025.0.9 and Horizon 36.0.3 or newer. Meridian and Horizon installation instructions state that they are intended for installation within an organization's private networks and should not be directly accessible from the Internet.",
"evidence": "osv:UBUNTU-CVE-2026-19135",
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{
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{
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{
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{
"value": "3:13.0.1-0ubuntu5",
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{
"value": "3:13.0.1-0ubuntu6",
"evidence": "/affected/1/versions"
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{
"value": "3:13.0.2-0ubuntu1",
"evidence": "/affected/1/versions"
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{
"value": "3:13.0.2-0ubuntu2",
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{
"value": "3:13.0.2-0ubuntu3",
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{
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{
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{
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{
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{
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{
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{
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{
"value": "3:18.2.1~git2020041013.754804667-0ubuntu3",
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{
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"evidence": "/affected/2/versions"
},
{
"value": "3:18.3.2-0ubuntu0.20.04.2",
"evidence": "/affected/2/versions"
},
{
"value": "3:18.3.2-0ubuntu0.20.04.4",
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{
"value": "3:18.3.3-0ubuntu1",
"evidence": "/affected/2/versions"
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{
"value": "3:18.3.4-0ubuntu1",
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{
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{
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{
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{
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"severity": "medium",
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"aliases": [
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],
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{
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},
{
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},
{
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},
{
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},
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},
{
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]
}
},
{
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],
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},
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"4:22.1.1-0ubuntu1",
"4:22.1.1-0ubuntu1.1"
],
"database_specific": {
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},
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},
{
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],
"modified": "2026-10-17T12:59:54.144676509Z",
"provider": "osv",
"upstream": [
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],
"references": [
"https://ubuntu.com/security/CVE-2026-19135",
"https://www.cve.org/CVERecord?id=CVE-2026-19135",
"https://github.com/OpenNMS/opennms/pull/8754"
]
},
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{
"value": "CVE-2026-19135",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 359909,
"published_at": "2026-08-13T05:17:00+00:00"
}