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What is Coordinated Disclosure?

Illustration: Coordinated Disclosure
Simply put, like I'm 5 years oldImagine you find a hole in your neighbour's fence. You tell them quietly first, so they can fix it before you tell everybody, and before anyone sneaks through.

The slightly longer version

Coordinated disclosure is a polite, careful way to handle a security bug. A bug is a mistake in software that an attacker could use. The person who finds it tells the software makers privately first. They agree on a schedule. The makers build a fix, called a patch. Then, on a set day, the bug and the patch are announced together, so people can update right away.

The idea is simple: give defenders a head start. If the bug is announced before the fix is ready, attackers can use it while everyone is still exposed. This private waiting time is often called an embargo. It only works if everyone keeps the secret and the people fixing the bug have enough time and help.

How coordinated disclosure should work

  1. Bug foundA researcher, maybe helped by AI, finds a security flaw.
  2. Private reportThey quietly tell the software makers, not the public.
  3. Fix builtThe makers write and test a patch during a secret waiting time.
  4. Public announcementThe bug and the patch are announced together on a planned day.
  5. Everyone updatesWebsite owners install the patch before attackers can use the bug.
Why it matters

With PHP2Shell, AI found two critical bugs in PHP, a language behind a big part of the web. The bugs were reported privately on August 11, but the bug IDs leaked on forums on October 20, one day before the official fix. Governments in several countries took sites offline to stay safe, so normal citizens lost access to public services, even with no confirmed break-in.

What to watch out for

The rules for disclosure are mostly informal habits, not law, and nobody is clearly in charge of the speed. AI labs that find bugs, like OpenAI, are now also proposing how disclosure should work, while the fixing often falls on a small group of tired volunteers. Whether lab-led coordination will protect people or mostly suit the labs is not known yet.

Where it showed up

This notion came up in AI Found the Fire. Then the Fire Brigade Was 13 Tired Volunteers. More lessons: Learn.

Sources

Written on 2026-10-29. This explanation was accurate on that day. AI changes fast, so check the sources and the date before you rely on it.

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