UBUNTU-CVE-2026-45538

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Source
https://ubuntu.com/security/CVE-2026-45538
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45538.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-45538
Upstream
Published
2026-08-04T21:16:00Z
Modified
2026-08-06T03:09:02Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

OpenSIPS is a Session Initiation Protocol (SIP) server implementation. In versions 4.0.0 and prior, processing a SIP message with a header name longer than 255 bytes causes a stack buffer overflow when sip_to_json() is called in the routing script. Function sip_to_json() (modules/sipmsgops/sipmsgops.c) copies SIP header names into a fixed 255-byte stack buffer without bounds checking, performing a memcpy of the full header-name length even though the SIP parser imposes no such limit (a header name can be roughly 65000 bytes). As a result, when a routing script calls sip_to_json(), a SIP message with a header name longer than 255 bytes triggers a stack buffer overflow in which both the length and content of the overwrite are attacker-controlled, corrupting the saved frame pointer and return address. A single unauthenticated UDP packet to the SIP port (5060) can crash the process or, on builds without stack protections, hijack the return address to achieve remote code execution. This affects deployments whose routing script invokes sip_to_json(). This issue was not fixed at the time of publication.

References

Affected packages

Ubuntu:18.04:LTS / opensips

Package

Name
opensips
Purl
pkg:deb/ubuntu/opensips?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.2.2-3build2
2.2.2-3build3
2.2.2-3build4

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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45538.json"