IP and DNS Leaks in WebKit Affecting Proxy Browsers and iCloud Private Relay
IP and DNS Leaks in WebKit Affecting Proxy Browsers and Apple iCloud Private Relay 2026-08-04by Talal Haj Bakry and Tommy Mysk WebKit-based browsers on iOS and macOS can be configured to route all web traffic through proxy servers, which is how Tor browsers on iOS and our own Psylo work. We found three WebKit features — DNS prefetching, WebAuthn Related Origin Requests, and WebTransport — that bypass the configured proxy and send traffic directly from the device, which exposes the user’s real network. The same leaks also affect Apple’s iCloud Private Relay.
- ▪IP and DNS Leaks in WebKit Affecting Proxy Browsers and Apple iCloud Private Relay 2026-08-04by Talal Haj Bakry and Tommy Mysk WebKit-based browsers on iOS and macOS can be configured to route all web traffic through proxy servers, which is
- ▪We found three WebKit features — DNS prefetching, WebAuthn Related Origin Requests, and WebTransport — that bypass the configured proxy and send traffic directly from the device, which exposes the user’s real network.
- ▪The same leaks also affect Apple’s iCloud Private Relay.
2 outlets in our directory ran this story. All of the coverage we found sits in one bucket: centre. That one-sidedness is itself worth noticing.
- ▪ WebKit leaks in iOS & macOS expose IP and DNS in spite of proxy use — AppleInsider
Hacker News (Front Page) files mainly under programming. We currently carry 1,106 of its stories. Top-voted stories on Hacker News.
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Source · retrieval · rights · ranking — open for full record
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Story provenance
Attribution is not the same as permission. This drawer separates discovery metadata, excerpts, WeSearch-generated summaries, reuse status, and whether the publisher receives the visit. Nothing here claims a legal grant the publisher has not made.
Record
| Original publisher | Mysk Blog – In-Depth Cybersecurity & Mobile App Privacy Research |
| Canonical URL | https://mysk.blog/2026/08/04/webkit-proxy-icloud-private-relay-ip-leak/ |
| Publication time | Tue, 04 Aug 2026 23:31:46 +0000 |
| Retrieval time | 2026-08-05T00:00:48.112Z |
| Last seen | 2026-08-05T00:00:48.112Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | GZ066bu3B4ac · 2 stories |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
IP and DNS Leaks in WebKit Affecting Proxy Browsers and Apple iCloud Private Relay 2026-08-04by Talal Haj Bakry and Tommy Mysk WebKit-based browsers on iOS and macOS can be configured to route all web traffic through proxy servers, which is how Tor browsers on iOS and our own Psylo work. We found three WebKit features — DNS prefetching, WebAuthn Related Origin Requests, and WebTransport — that bypass the configured proxy and send traffic directly from the device, which exposes the user’s real network. The same leaks also affect Apple’s iCloud Private Relay. All three are fixed in Psylo 1.3.1. Table of Contents Summary Background Proxy Configuration on iOS and macOS DNS Leak Reported by a Psylo User iCloud Private Relay 1. DNS Prefetching 2. WebAuthn Related Origin Requests 3.
…
Excerpt limited to ~120 words for fair-use compliance. The full article is at Mysk Blog – In-Depth Cybersecurity & Mobile App Privacy Research.
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