ubuntu-cve-2026-45809
Vulnerability from osv_ubuntu
Published
2026-08-05 00:17
Modified
2026-08-05 00:17
Summary
Details
OpenSIPS is a Session Initiation Protocol (SIP) server implementation. Versions prior to 3.6.6 and 4.0.0-rc1 contain a denial of service vulnerability in the watcherinfo generation functionality. An attacker can create an oversized watcher entry by sending a SUBSCRIBE Event: presence request with a long From URI, and then trigger presence.winfo watcherinfo XML generation for the same presentity. OpenSIPS copies the stored watcher URI into a fixed-size stack buffer, overflowing it and crashing the process. A remote attacker can crash an OpenSIPS worker in deployments that expose handle_subscribe() and allow watcherinfo (presence.winfo) generation. The issue is configuration-dependent because the presence and presence_xml modules must be loaded and SUBSCRIBE routing must be reachable. This issue has been fixed in versions 3.6.6 and 4.0.0-rc1.
Severity
N/A (UNKNOWN)
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "opensips",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-b2bua-module",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-berkeley-bin",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-berkeley-module",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-carrierroute-module",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-compression-module",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-console",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-cpl-module",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-dbhttp-module",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-dialplan-module",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-emergency-module",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-geoip-module",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-http-modules",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-identity-module",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-jabber-module",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-json-module",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-ldap-modules",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-lua-module",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-memcached-module",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-mysql-module",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-perl-modules",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-postgres-module",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-presence-modules",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-rabbitmq-module",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-radius-modules",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-redis-module",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-regex-module",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-restclient-module",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-sctp-module",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-snmpstats-module",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-sqlite-module",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-tls-module",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-tlsmgm-module",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-unixodbc-module",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-wss-module",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-xmlrpc-module",
"binary_version": "2.2.2-3build4"
},
{
"binary_name": "opensips-xmpp-module",
"binary_version": "2.2.2-3build4"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "opensips",
"purl": "pkg:deb/ubuntu/opensips@2.2.2-3build4?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.2.2-3build2",
"2.2.2-3build3",
"2.2.2-3build4"
]
}
],
"aliases": [],
"details": "OpenSIPS is a Session Initiation Protocol (SIP) server implementation. Versions prior to 3.6.6 and 4.0.0-rc1 contain a denial of service vulnerability in the watcherinfo generation functionality. An attacker can create an oversized watcher entry by sending a SUBSCRIBE Event: presence request with a long From URI, and then trigger presence.winfo watcherinfo XML generation for the same presentity. OpenSIPS copies the stored watcher URI into a fixed-size stack buffer, overflowing it and crashing the process. A remote attacker can crash an OpenSIPS worker in deployments that expose handle_subscribe() and allow watcherinfo (presence.winfo) generation. The issue is configuration-dependent because the presence and presence_xml modules must be loaded and SUBSCRIBE routing must be reachable. This issue has been fixed in versions 3.6.6 and 4.0.0-rc1.",
"id": "UBUNTU-CVE-2026-45809",
"modified": "2026-08-05T00:17:00Z",
"published": "2026-08-05T00:17:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-45809"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-45809"
},
{
"type": "REPORT",
"url": "https://github.com/OpenSIPS/opensips/commit/c5970d3ee25b457ad2d78fe6e9662a12dae577cd"
},
{
"type": "REPORT",
"url": "https://github.com/OpenSIPS/opensips/commit/dd86461b71ff4a4f5194205896ae5f48f144240d"
},
{
"type": "REPORT",
"url": "https://github.com/OpenSIPS/opensips/security/advisories/GHSA-gx83-2gh8-7v56"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-45809"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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