CVE-2026-45103

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Source
https://cve.org/CVERecord?id=CVE-2026-45103
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45103.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-45103
Aliases
  • GHSA-jv35-555v-54jh
Downstream
Published
2026-08-04T21:56:57.422Z
Modified
2026-08-12T03:51:20.191930492Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
Summary
OpenSIPS: SIP Message Smuggling via TCP Content-Length Integer Overflow
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 (prototcp, prototls, protows, protowss) 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.

Database specific 
{
    "cwe_ids": [
        "CWE-190"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45103.json",
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/opensips/opensips

Affected ranges

Type
GIT
Repo
https://github.com/opensips/opensips
Events
Introduced
f3e0d5333913bcaace4c8f8711871550accca63f
Introduced
985272ff3d7ebc5e9f24ad9f8fcf8b1d2549f1b6
Fixed
26c0c4e3364806e77c2915b1c3e03bf9bd90dccd
Fixed
b3621031661ed10d6af511d7c41f512075357a00
Fixed
4d23613b
Fixed
5f103eff
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "3.4.0"
        },
        {
            "fixed": "3.6.6"
        },
        {
            "introduced": "4.0.0-beta"
        },
        {
            "fixed": "4.0.0-rc1"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

4.*
4.0.0-beta

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45103.json"