Security vulnerabilities and automated fixes for electron updater issues
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electron-updater and electron-builder rely on builder-util-runtime to fetch update manifests and artifacts over HTTP. A flaw in that shared HTTP executor allowed credential headers attached to the original update-feed request to be re-sent after a redirect, exposing them to any host the redirect pointed to. The project fixes this by upgrading builder-util-runtime to 9.7.0 and collapsing a duplicate, older copy of the package that electron-updater had pinned on its own.
CVE-2026-54673 is a high-severity information disclosure vulnerability in `electron-updater` (via `builder-util-runtime`) where credential headers are not stripped before following HTTP redirects, potentially exposing authentication tokens to unintended servers. The vulnerability was present in `builder-util-runtime@9.5.1` and was resolved by upgrading to `9.7.0`. This fix is critical for any Electron application that uses auto-update functionality against endpoints that may issue redirects.
A critical vulnerability in electron-updater (CVE-2026-54673) allowed OAuth tokens and API credentials to leak when HTTP redirects occurred during application updates. The fix upgrades electron-updater from version 6.3.0 to 6.8.9, which properly strips sensitive authorization headers before following redirects to external domains.