Elixir WebRTC: Missing DTLS peer fingerprint validation in ex_webrtc client-role handshake
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Spoofing
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-295.
Summary
Elixir WebRTC is an Elixir implementation of the W3C WebRTC API. Prior to 0.15.1 and 0.16.1, missing DTLS peer certificate fingerprint validation in the DTLS client (active) role removes one side of WebRTC's mutual authentication. The bug is not independently exploitable for media interception in standard deployments, but enables a full man-in-the-middle attack when chained with insecure signalling or a peer with similar validation gaps. This vulnerability is fixed in 0.15.1 and 0.16.1.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| elixir-webrtc | ex_webrtc | before 0.15.1; 0.16.0 to before 0.16.1 | 0.15.1, 0.16.1 | Patch available | CNA |
| — | ex_webrtc (Hex) | before 0.15.1 | 0.15.1 | Patch available | GHSA-qwfw-ggxw-577c |
| — | ex_webrtc (Hex) | 0.16.0 to before 0.16.1 | 0.16.1 | Patch available | GHSA-qwfw-ggxw-577c |
- ex_webrtc Vendorelixir-webrtc Affected before 0.15.1; 0.16.0 to before 0.16.1 Fixed in 0.15.1, 0.16.1 Patch available CNA
- ex_webrtc (Hex) Vendor— Affected before 0.15.1 Fixed in 0.15.1 Patch available GHSA-qwfw-ggxw-577c
- ex_webrtc (Hex) Vendor— Affected 0.16.0 to before 0.16.1 Fixed in 0.16.1 Patch available GHSA-qwfw-ggxw-577c
Remediation
- Fix · CNA ex_webrtc (elixir-webrtc) Fixed in 0.15.1, 0.16.1
- Fix · GHSA-qwfw-ggxw-577c ex_webrtc (Hex) Fixed in 0.15.1 Advisory →
- Fix · GHSA-qwfw-ggxw-577c ex_webrtc (Hex) Fixed in 0.16.1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-44700
- 2026-10-03 Alias added: GHSA-qwfw-ggxw-577c
References
Other 7
- https://github.com/elixir-webrtc/ex_webrtc/security/advisories/GHSA-qwfw-ggxw-577c
- https://github.com/elixir-webrtc/ex_webrtc/issues/249
- https://github.com/elixir-webrtc/ex_webrtc/pull/250
- https://github.com/elixir-webrtc/ex_webrtc/releases/tag/v0.15.1
- https://github.com/elixir-webrtc/ex_webrtc/releases/tag/v0.16.1
- https://github.com/elixir-webrtc/ex_webrtc/commit/658c63221a869fb12bb9989599c3688751b0531b
- https://github.com/elixir-webrtc/ex_webrtc
Sources
- CVE-2026-44700 · CVE Program
- CVE-2026-44700 · NVD
- FIRST EPSS
- GHSA-qwfw-ggxw-577c · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences