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[Sandbox] Announce the eMudhra fix in 0.12.14 - #34511
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The private keys of eight eMudhra intermediate CAs can be recovered, and Sandbox SDK images up to 0.12.12 trust certificates that chain to them. In the 0.12.13 images, the CA bundle, Node.js, cloudflared, and pip reject those certificates, and 0.x users get that only by moving both the package and the image to 0.12.13. 1.x has no release to update to: the user's own image decides what sandboxes trust, so those users need to rebuild it. The entry tells both groups what to do. Bun checks certificates against its own built-in list, so the entry also gives workarounds for `bun`, OpenCode, and large backups until a release updates Bun.
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The entry described what changed in the 0.12.13 images before it said what readers had to do, and it never told anyone when they were done. Put the actions first, under "What you need to do", split by SDK line. 0.x users update the package and image to 0.12.13 now. The Bun workarounds apply only to sandboxes that run bun or OpenCode or upload large backups, and a closing line says the update is otherwise enough. 1.x users rebuild their own image. The list of updated components moves to the end. The description now names 0.x, so 1.x readers aren't told to install 0.12.13.
The 1.x section said to pull the base image and rebuild without the build cache, which is not enough on its own. wrangler deploy builds with the local images and build cache and does not pull, so the steps now say how to refresh both. Running sandboxes keep the image they started with, and a snapshot restores the image it came from, so the section also says to stop running sandboxes and to take new snapshots. Say that a 0.x deployment's rollout replaces running sandboxes, and add a check against the test hosts for both versions.
0.12.14 updates Bun to 1.4.4, so the `bun` command, OpenCode and large backups no longer need workarounds. The entry now tells 0.x users to update to 0.12.14, or to 0.13.0-next.825.1 on the next prerelease, and says what 0.12.13 and 0.12.14 each changed.
ghostwriternr
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Users on 0.8.7 or later who cannot update yet can send all HTTPS through their Worker, so that Cloudflare checks the certificates on port 443. The entry also says what that leaves uncovered: TLS on other ports, such as cloudflared tunnels.
irvinebroque
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Oct 22, 2026
Outbound interception needs the ContainerProxy export from the Worker entrypoint. Without it, @cloudflare/containers throws before the container starts, so a reader who copied the snippet as written would stop their sandboxes from starting instead of protecting them.
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Summary
Adds a changelog entry for the eMudhra intermediate compromise (blog post). It tells 0.x users to update the package and image to 0.12.14, and tells 1.x users how to rebuild and replace their images.
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