Vulnerability details
CVE-2026-46334
OpenSIPS: Denial of Service in SDP bandwidth parsing via QoS SDP cloning
Official description
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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.7High | 4.0 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| opensips | OpenSIPS | >= 3.4.0, < 3.6.6 | CVEProject cvelistV5 (CNA) |
| opensips | OpenSIPS | >= 4.0.0-beta, < 4.0.0-rc1 | CVEProject cvelistV5 (CNA) |
References and advisories
3- https://github.com/OpenSIPS/opensips/commit/8fe74b01f6fbf86c0b5e290735275530cb65e0fb x_refsource_MISC
- https://github.com/OpenSIPS/opensips/commit/ac5309d5b8206cd3dbe1b4e01567c8db1ce31444 x_refsource_MISC
- https://github.com/OpenSIPS/opensips/security/advisories/GHSA-rh36-mhpv-cx2r x_refsource_CONFIRM
Details
- Published
- 2026-08-05
- Last updated
- 2026-08-05
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Proof of concept
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-476NULL Pointer Dereference
- CWE-20Improper Input Validation