CVE-2026-93710 Dancer2 versions from 2.0.0 before 2.2.0 for Perl dispatch a route that a dying hook refused when the exception handler halts the response in compile_hooks.
Attackers can bypass security checks in Dancer2 hooks, causing refused routes to execute and modify data despite intended blocks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-93710?
CVE-2026-93710 is a high-severity vulnerability, published on 22 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Dancer2 versions from 2.0.0 before 2.2.0 for Perl dispatch a route that a dying hook refused when the exception handler halts the response in compile_hooks.
A hook that dies fires core.app.hook_exception, then calls cleanup unless the failing hook is the exception handler. A handler that halts does not stop that cleanup, which discards the request, response and session the dispatcher has yet to read, so the refused route runs.
The handler has to halt the response object by calling its halt method or setting is_halted: the halt keyword unwinds through with_return before cleanup runs.
A check in a before hook is not enforced: the caller gets the refusal, while the route body runs and its writes land.
Weakness: CWE-460
Which versions are affected by CVE-2026-93710?
How do I fix CVE-2026-93710?
Upgrade to a fixed version.
Is CVE-2026-93710 being exploited?
There is no known exploitation of CVE-2026-93710 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-93710, GHSA-qp5m-r6hx-rjhj, GHSA-v527-r4px-7vx7, UBUNTU-CVE-2026-93710.