UBUNTU-CVE-2026-45100

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Source
https://ubuntu.com/security/CVE-2026-45100
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45100.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-45100
Upstream
Published
2026-08-04T22:17:00Z
Modified
2026-08-06T03:09:02.006046518Z
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. Versions 3.4.0-beta through 3.6.5 and 4.0.0-beta contain a buffer overflow in the {s.b64encode} string transformation. The size check for {s.b64encode} only verifies that the input fits within the 64 KB transformation buffer, but base64 encoding expands the data by roughly a third, so an input between about 49,153 and 65,535 bytes produces more output than the buffer can hold and overflows it by up to 21,844 bytes. Because these transformation buffers sit next to each other in memory and are reused for chained transformations, the overflow writes attacker-controlled data into the adjacent buffer and corrupts values used by later transformations processing the same SIP message. A remote attacker can trigger this by sending a SIP message with a large header value (roughly 50,000 bytes or more) when the routing script applies  {s.b64encode}  to attacker-controlled input, making exploitability dependent on the deployment's routing configuration. 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_version": "2.2.2-3build4",
            "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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45100.json"