Read the docs
TI-2026-40185 Aliases CVE-2026-55663GHSA-p7x2-g5cq-fhmq

Insufficient verification of data authenticity in versatica mediasoup

Priority MEDIUM 58CWE-345Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Security bypass
Confidentiality · integrity · availability
Low · Low · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-345.

Summary

mediasoup is a WebRTC video conferencing system. From version 3.20.0 until 3.20.6 for the npm package and from 0.22.0 until 0.22.5 for the Rust crate, mediasoup's built-in SCTP stack authenticates state cookies using only the hardcoded msworker and 0xAD81 magic values instead of a per-instance secret and HMAC, contrary to RFC 9260 Section 5.1.3. The cookie structure and validation in worker/include/RTC/SCTP/association/StateCookie.hpp and worker/src/RTC/SCTP/association/StateCookie.cpp allow an on-path attacker targeting PlainTransport or PipeTransport with SCTP enabled and without DTLS protection to forge a COOKIE-ECHO whose packet verification tag matches the attacker-controlled localVerificationTag. The forged cookie passes StateCookie::IsMediasoupStateCookie() and Association::HandleReceivedCookieEchoChunk(), establishes an unauthorized SCTP association, and permits DataChannel message injection as a trusted peer. WebRtcTransport is not affected because its SCTP runs inside DTLS. This issue is fixed in npm version 3.20.6 and Rust crate version 0.22.5.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00188 8th percentileScored 2026-11-07
Fix Fixed mediasoup (versatica): 3.20.6, 0.22.5mediasoup (npm): 3.20.6+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
versaticamediasoup3.20.0 to before 3.20.6; 0.22.0 to before 0.22.53.20.6, 0.22.5Patch availableCNA
—mediasoup (npm)3.20.0 to before 3.20.63.20.6Patch availableGHSA-p7x2-g5cq-fhmq
—mediasoup (crates.io)0.22.0 to before 0.22.50.22.5Patch availableGHSA-p7x2-g5cq-fhmq
  • mediasoup Vendorversatica Affected 3.20.0 to before 3.20.6; 0.22.0 to before 0.22.5 Fixed in 3.20.6, 0.22.5 Patch available CNA
  • mediasoup (npm) Vendor— Affected 3.20.0 to before 3.20.6 Fixed in 3.20.6 Patch available GHSA-p7x2-g5cq-fhmq
  • mediasoup (crates.io) Vendor— Affected 0.22.0 to before 0.22.5 Fixed in 0.22.5 Patch available GHSA-p7x2-g5cq-fhmq

Remediation

  • Fix · CNA mediasoup (versatica) Fixed in 3.20.6, 0.22.5
  • Fix · GHSA-p7x2-g5cq-fhmq mediasoup (npm) Fixed in 3.20.6 Advisory →
  • Fix · GHSA-p7x2-g5cq-fhmq mediasoup (crates.io) Fixed in 0.22.5 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55663
  2. 2026-10-03 Alias added: GHSA-p7x2-g5cq-fhmq

References

Other 5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences