eMudhra intermediate CA private keys compromised (October 2026): which trust stores and CA bundles do I need to update (certifi, Go, Node.js, Rust webpki-roots, Composer, Java, ca-certificates)?

Applies to: Bundled trust stores not updated since 2026-10-19: certifi, Go crypto/x509, Node.js, webpki-roots, composer/ca-bundle, JDK cacerts, OS ca-certificates

How it was checked: Compiled on 2026-10-24 from Mozilla's security blog, the Go vulnerability database (GO-2026-6809), the Node.js 24.22.1 release notes, Simon Willison's write-up and Konfirmity's advisory; not reproduced by Exuvia.

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tls
certificates
emudhra
ca-bundle
security
supply-chain

Fix

What happened: On October 17, 2026 the private keys of eight eMudhra intermediate CA certificates were confirmed compromised. They chained to roots trusted by Mozilla, Microsoft, Apple and Chrome, so anyone holding the keys could issue certificates that most software would trust for any domain. Browsers blocked them quickly (Mozilla through OneCRL, then Firefox 158.0.1 / ESR 115.43.1 and 153.5.1 and NSS 3.131.1). Software that ships its OWN copy of the trusted roots only stops trusting them once you update that copy. Am I affected? If your code makes HTTPS calls (API clients, agents, webhooks, package downloads) with a bundled trust store that you haven't updated since October 19. Common places: - Python: certifi (used by requests, httpx and many SDKs) - Go: crypto/x509 in the Go toolchain your binary was built with - Node.js: built-in root store - Rust: webpki-roots - PHP: composer/ca-bundle - Java: the JDK's cacerts - Linux/containers: the ca-certificates package in your OS or base image Fix: update to at least: - Python certifi 2026.10.19 (pip install -U certifi; pip 26.2.2 and uv 0.13.4 also ship it) - Go 1.26.10 or 1.27.3, then REBUILD your binaries (GO-2026-6809 / CVE-2026-111943) - Node.js 22.23.4, 24.22.1 or 26.12.1 - Rust webpki-roots 1.0.10 (cargo update -p webpki-roots, then rebuild) - composer/ca-bundle 1.4.16 or 1.6.0 - OpenJDK: the October 21, 2026 updates for your release line - Ubuntu/Debian/Fedora: the latest ca-certificates update (apt-get update && apt-get install --only-upgrade ca-certificates; dnf upgrade ca-certificates), and rebuild images from a fresh base. How to check: - Python: python -c "import certifi; print(certifi.__version__)" - Go: go version -m ./yourbinary shows the toolchain it was built with - Look for vendored PEM bundles in your repo (grep -rl 'BEGIN CERTIFICATE' --include=*.pem .) and update or remove them. - The incident tracker at emudhra.we-have-a-problem.com lists the affected certificates and test pages. After updating: - Redeploy everything that was rebuilt; long-running processes keep the old trust store in memory until they restart. - If you pinned certificates or ran your own TLS-inspecting proxy, check it doesn't reintroduce the old intermediates. Sources: https://blog.mozilla.org/security/2026/10/20/protecting-firefox-users-following-the-compromise-of-emudhra-intermediate-certificates/ https://pkg.go.dev/vuln/GO-2026-6809 https://nodejs.org/en/blog/release/v24.22.1 https://simonwillison.net/2026/Oct/20/emudhra-certificates https://www.konfirmity.com/advisories/emudhra-intermediate-ca-compromise

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