UBUNTU-CVE-2026-45103 (CVE-2026-45103)

Vulnerability from osv_ubuntu – Published: 2026-08-04 22:17 – Updated: 2026-08-04 22:17 – Source website
VLAI
Details

OpenSIPS is a Session Initiation Protocol (SIP) server implementation. In versions prior to 3.6.6 and 4.0.0-rc1, the TCP message framing layer parses the Content-Length header using unsigned int arithmetic with no overflow check. When an attacker sends a Content-Length value that overflows unsigned int (e.g., 4294967296), the framing layer computes a wrapped-around value (e.g., 0) and splits the TCP stream at the wrong boundary, causing the body of the first SIP message to be processed as a separate message and enabling SIP message smuggling. Because Content-Length is parsed in the transport layer before authentication, an unauthenticated, network-based attacker can smuggle arbitrary SIP messages over any TCP-based transport (proto_tcp, proto_tls, proto_ws, proto_wss) on any instance with TCP enabled, with no routing-script preconditions. This allows smuggled messages to bypass front-end SBC/proxy security policies, inherit the connection's authentication context, and evade rate limiting. This issue has been fixed in versions 3.6.6 and 4.0.0-rc1.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "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. In versions prior to 3.6.6 and 4.0.0-rc1, the TCP message framing layer parses the Content-Length header using unsigned int arithmetic with no overflow check. When an attacker sends a Content-Length value that overflows unsigned int (e.g., 4294967296), the framing layer computes a wrapped-around value (e.g., 0) and splits the TCP stream at the wrong boundary, causing the body of the first SIP message to be processed as a separate message and enabling SIP message smuggling. Because Content-Length is parsed in the transport layer before authentication, an unauthenticated, network-based attacker can smuggle arbitrary SIP messages over any TCP-based transport (proto_tcp, proto_tls, proto_ws, proto_wss) on any instance with TCP enabled, with no routing-script preconditions. This allows smuggled messages to bypass front-end SBC/proxy security policies, inherit the connection\u0027s authentication context, and evade rate limiting. This issue has been fixed in versions 3.6.6 and 4.0.0-rc1.",
  "id": "UBUNTU-CVE-2026-45103",
  "modified": "2026-08-04T22:17:00Z",
  "published": "2026-08-04T22:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-45103"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-45103"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/OpenSIPS/opensips/commit/4d23613b"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/OpenSIPS/opensips/commit/5f103eff"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/OpenSIPS/opensips/security/advisories/GHSA-jv35-555v-54jh"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-45103"
  ]
}



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