---
id: CVE-2026-46334
title: OpenSIPS is a Session Initiation Protocol (SIP) server implementation
summary: >-
  OpenSIPS is a Session Initiation Protocol (SIP) server implementation.
  Versions prior to 3.6.6 and 4.0.0-rc1 contain a denial of service
  vulnerability in the SDP bandwidth-line parsing logic. A SIP request with
  Content-Type: application/…
severity: none
cwe:
  - CWE-20
  - CWE-476
published: '2026-08-05'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T20:41:31.497'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-46334'
references:
  - url: >-
      https://github.com/OpenSIPS/opensips/commit/8fe74b01f6fbf86c0b5e290735275530cb65e0fb
    label: security-advisories@github.com
  - url: >-
      https://github.com/OpenSIPS/opensips/commit/ac5309d5b8206cd3dbe1b4e01567c8db1ce31444
    label: security-advisories@github.com
  - url: >-
      https://github.com/OpenSIPS/opensips/security/advisories/GHSA-rh36-mhpv-cx2r
    label: security-advisories@github.com
  - url: >-
      https://github.com/OpenSIPS/opensips/security/advisories/GHSA-rh36-mhpv-cx2r
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00488
epssPercentile: 0.41161
ingestedAt: '2026-09-08T21:11:12.267Z'
---

## Overview

OpenSIPS is a Session Initiation Protocol (SIP) server implementation. Versions prior to 3.6.6 and 4.0.0-rc1 contain a denial of service vulnerability in the SDP bandwidth-line parsing logic. A SIP request with Content-Type: application/sdp and a malformed session-level SDP bandwidth line missing the required colon delimiter can corrupt parsed SDP bandwidth metadata. When a route or module subsequently clones the corrupted SDP state, as occurs with dialog and QoS processing, the OpenSIPS worker process crashes. An unauthenticated remote attacker can therefore trigger a crash in any configuration whose routing script parses attacker-controlled SDP and applies dialog/QoS processing. This issue has been fixed in versions 3.6.6 and 4.0.0-rc1.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.