UBUNTU-CVE-2026-45537

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2026-45537
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45537.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-45537
Upstream
  • CVE-2026-45537
Published
2026-08-04T23:16:00Z
Modified
2026-08-06T03:09:02.095764867Z
Severity
  • 9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

OpenSIPS is a Session Initiation Protocol (SIP) server implementation. In versions prior to 3.6.6 and 4.0.0-rc1, the constructuri() function concatenates multiple URI components (protocol, username, domain, port, params) into a fixed 1024-byte global BSS buffer without any bounds checking. When a routing script calls constructuri() with an attacker-controlled username, a combined component length exceeding 1024 bytes overflows the buffer, corrupting adjacent global data with attacker-controlled content. The overflow reaches disable503translation, a global flag controlling SIP 503 response handling, allowing an attacker to deterministically set the flag via the URI username and alter the server's routing behavior for subsequent messages. Because the same buffer is shared with contact_builder(), the overflow also corrupts that function's data, and without a memory sanitizer the adjacent globals are silently overwritten on every request containing a long username. This issue has been fixed in versions 3.6.6 and 4.0.0-rc1.

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
0Unknown 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-2026-45537.json"