312332 2026-04-14 17:24:17 -0700 REGRESSION (Safari 26.3 - 26.4): RTCPeerConnection with iceTransportPolicy "relay" gathers zero ICE candidates 2026-04-21 09:55:53 -0700 1 1 1 Unclassified WebKit WebRTC Safari 26 Mac (Apple Silicon) macOS 15 RESOLVED FIXED InRadar, Regression P2 Critical --- 1 devalevd youennf ahmad.saleem792 webkit-bug-importer youennf oldest_to_newest 2200440 0 479076 devalevd 2026-04-14 17:24:17 -0700 Created attachment 479076 ICE gathering issue reproducing sample # Description After upgrading to Safari 26.4, `RTCPeerConnection` configured with `iceTransportPolicy: "relay"` and valid TURN server credentials fails to gather any ICE candidates. The `iceGatheringState` transitions to `"gathering"` but never reaches `"complete"`, and zero `icecandidate` events are fired. This worked correctly in Safari 26.3 and earlier. We suspect this is related to the change in Safari 26.4 ("Fixed RTCConfiguration.iceServers to be a non-optional sequence with an empty array as the default"). The spec compliance fix may have introduced a side effect where TURN relay candidate allocation silently fails. ## Steps to Reproduce I have also attached a sample HTML file to run. It includes a global TURN server URL as test URL. But apart from it, some code: 1. Create an `RTCPeerConnection` with TURN credentials and relay-only policy: ```javascript const pc = new RTCPeerConnection({ iceServers: [{ urls: ["turns:turn.example.com:443?transport=tcp"], username: "<valid-username>", credential: "<valid-password>" }], iceTransportPolicy: "relay" }); ``` 2. Add a media track (audio or video) 3. Create and set a local offer: ```javascript const offer = await pc.createOffer(); await pc.setLocalDescription(offer); ``` 4. Listen for ICE candidates: ```javascript pc.onicecandidate = (event) => { console.log("candidate:", event.candidate); }; pc.onicegatheringstatechange = () => { console.log("gathering state:", pc.iceGatheringState); }; ``` ## Expected Results - `iceGatheringState` transitions: `"new"` → `"gathering"` → `"complete"` - At least one relay `icecandidate` event fires - A null candidate event fires indicating gathering is complete ## Actual Results - `iceGatheringState` transitions to `"gathering"` and stays there indefinitely - Zero `icecandidate` events fire - Gathering never completes, causing a timeout ## Regression - **Safari 26.3:** Works correctly — relay candidates gathered within 1-2 seconds - **Safari 26.4:** Broken — zero candidates, gathering hangs indefinitely ## Impact This is a critical regression affecting production WebRTC applications. We have confirmed this across multiple users on Safari 26.4 / macOS 15.7.5 using the Amazon Chime SDK for JavaScript (v3.30.0) (https://github.com/aws/amazon-chime-sdk-js). Meeting connections fail 100% of the time on Safari 26.4 with a 30-second timeout, directly impacting users session joins. ## Additional Testing We also reproduced this using the official WebRTC sample at https://webrtc.github.io/samples/src/content/peerconnection/trickle-ice/ — when configured with valid TURN servers, Safari 26.4 gathers zero relay candidates. The same TURN servers produce relay candidates on Safari 26.3, Chrome, Edge, and Firefox. This confirms the issue is in Safari's WebRTC stack and not specific to any particular application or SDK. ## Environment - Safari 26.4 on macOS 15.7.5 - Tested on stable Wi-Fi, no VPN, no corporate firewall - Works on Chrome, Edge, Firefox on the same machine - Works on Safari 26.3 and earlier 2200465 1 webkit-bug-importer 2026-04-14 18:54:52 -0700 <rdar://problem/174794660> 2200758 2 devalevd 2026-04-15 12:11:31 -0700 You can also use the HTML sample reproduction I have attached or follow below browse console steps. # Reproduction steps in browser console ## Prerequisites - Obtain fresh TURN credentials (TTL is 300s, so run steps promptly) - Open Safari DevTools Console (⌘⌥C) ## Step 1 — Create PeerConnection with relay policy ```javascript const pc = new RTCPeerConnection({ iceServers: [{ urls: [ "turn:ice.m1.uw2.app.chime.aws:3478?transport=udp", "turns:ice.m1.uw2.app.chime.aws:443?transport=tcp" ], username: "1776279934:61b1cc80-38fd-11f1-b2b7-02260fc92e3f", credential: "UrxjkNiC6UCE7Lb63k5JqvjfXTk=" }], iceTransportPolicy: "relay" }); ``` ## Step 2 — Attach event listeners ```javascript const start = performance.now(); const elapsed = () => ((performance.now() - start) / 1000).toFixed(2) + "s"; pc.onicecandidate = e => { if (e.candidate) { console.log(`[${elapsed()}] CANDIDATE: ${e.candidate.type} ${e.candidate.protocol} ${e.candidate.address}:${e.candidate.port}`); } else { console.log(`[${elapsed()}] Gathering complete (null candidate)`); } }; pc.onicecandidateerror = e => { console.warn(`[${elapsed()}] ICE error: code=${e.errorCode} "${e.errorText}" url=${e.url}`); }; pc.onicegatheringstatechange = () => { console.log(`[${elapsed()}] iceGatheringState → ${pc.iceGatheringState}`); }; // Timeout watchdog setTimeout(() => { console.error(`[${elapsed()}] ⏰ FULL TIMEOUT REACHED — iceGatheringState: ${pc.iceGatheringState}`); pc.close(); }, 30000); ``` ## Step 3 — Add transceiver, create offer, start gathering ```javascript pc.addTransceiver("audio", { direction: "sendrecv" }); pc.createOffer().then(offer => { console.log(`[${elapsed()}] Offer created (ufrag=${offer.sdp.match(/a=ice-ufrag:(\S+)/)?.[1]})`); return pc.setLocalDescription(offer); }).then(() => { console.log(`[${elapsed()}] 🚀 setLocalDescription done — iceGatheringState: ${pc.iceGatheringState}`); }); ``` ## Expected Output ### MacOS 26 Safari 26.4 / Chrome / Firefox (working) ``` [0.01s] Offer created (ufrag=...) [0.01s] setLocalDescription done — iceGatheringState: gathering [0.02s] iceGatheringState → gathering [0.50s] CANDIDATE: relay udp <ip>:port [0.80s] CANDIDATE: relay tcp <ip>:port [0.81s] Gathering complete (null candidate) [0.81s] iceGatheringState → complete ``` ### MacOS 15 ( Safari 26.4 (broken) ``` ... [30.00s] ⏰ TIMEOUT — iceGatheringState: gathering ``` So ICE gathering never moves to complete state. Issue is with Safari 26.4 and so far consistently reproducible with Chime SDK TURN servers with relay with below macOS version: MacOS 15.7.5, 15.7.3 and 15.7.1 2201016 3 youennf 2026-04-16 04:55:43 -0700 Pull request: https://github.com/WebKit/WebKit/pull/62891 2201406 4 ews-feeder 2026-04-17 00:11:16 -0700 Committed 311432@main (da04f8d6cf5c): <https://commits.webkit.org/311432@main> Reviewed commits have been landed. Closing PR #62891 and removing active labels. 2201661 5 devalevd 2026-04-17 14:50:52 -0700 Thanks for the quick turnaround on the fix. We have customer reported high severity tickets and our metrics show that pretty much users using Mac OS 15.7.X (or 15.X) + Safari 26.4+ cannot join a WebRTC meeting through their application built on-top-of our JS SDK. The only workaround is to suggest them to use either a different browser, different Safari version < 26.4 if on MacOS 15 or upgrade the MacOS to v26 itself. Could you help us prioritizing this fix? Awaiting which version the fix would be in to test and accordingly to update our customers. 2202568 6 ews-feeder 2026-04-20 22:23:34 -0700 Committed 305413.698@safari-7624-branch (cbfb4c491ddf): <https://commits.webkit.org/305413.698@safari-7624-branch> Reviewed commits have been landed. Closing PR #5007 and removing active labels. 2202790 7 devalevd 2026-04-21 09:55:53 -0700 Hi Team, Thanks for the fix. Any update on which Safari version we could test this out on? 479076 2026-04-14 17:24:17 -0700 2026-04-14 17:24:17 -0700 ICE gathering issue reproducing sample ice-gathering-issue.html text/html 10352 devalevd PCFkb2N0eXBlIGh0bWw+CjxodG1sPgogIDxoZWFkPgogICAgPHRpdGxlPklDRSBHYXRoZXJpbmcg RGlhZ25vc3RpYzwvdGl0bGU+CiAgICA8c3R5bGU+CiAgICAgICogewogICAgICAgIGJveC1zaXpp bmc6IGJvcmRlci1ib3g7CiAgICAgICAgbWFyZ2luOiAwOwogICAgICAgIHBhZGRpbmc6IDA7CiAg ICAgIH0KICAgICAgYm9keSB7CiAgICAgICAgZm9udC1mYW1pbHk6IC1hcHBsZS1zeXN0ZW0sIHN5 c3RlbS11aSwgc2Fucy1zZXJpZjsKICAgICAgICBiYWNrZ3JvdW5kOiAjMWExYTJlOwogICAgICAg IGNvbG9yOiAjZTBlMGUwOwogICAgICAgIHBhZGRpbmc6IDIwcHg7CiAgICAgIH0KICAgICAgaDEg ewogICAgICAgIGZvbnQtc2l6ZTogMThweDsKICAgICAgICBjb2xvcjogIzdmZGJjYTsKICAgICAg ICBtYXJnaW4tYm90dG9tOiAxMnB4OwogICAgICB9CiAgICAgIC5jb250cm9scyB7CiAgICAgICAg YmFja2dyb3VuZDogIzE2MjEzZTsKICAgICAgICBib3JkZXItcmFkaXVzOiA4cHg7CiAgICAgICAg cGFkZGluZzogMTZweDsKICAgICAgICBtYXJnaW4tYm90dG9tOiAxNnB4OwogICAgICB9CiAgICAg 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