CVE-2026-42552 Flight: Sensitive information disclosure via default error handler in flightphp/core
The default error handler leaks stack traces and internal paths in HTTP 500 responses, exposing sensitive data to attackers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-42552?
CVE-2026-42552 is a high-severity vulnerability in flightphp core, published on 13 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Flight is an extensible micro-framework for PHP. Prior to 3.18.1, the default error handler Engine::_error() writes the full exception message, exception code, and stack trace (including absolute filesystem paths) directly into the HTTP 500 response, with no debug gating. Production deployments leak internal paths, any secret interpolated into an exception message, and full module structure — giving attackers primitives for chaining other weaknesses (LFI, path traversal). This vulnerability is fixed in 3.18.1.
Weakness: CWE-209
Which versions are affected by CVE-2026-42552?
2 open source packages ship an affected version, including flightphp/core.
| Package | Affected | Fixed in |
|---|---|---|
flightphp/core Packagist | All versions | 3.18.1 |
flightphp/core Packagist | All versions | 3.18.1 |
How do I fix CVE-2026-42552?
Upgrade flightphp/core to 3.18.1 or later.
Is CVE-2026-42552 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42552 exists.
Sources
Also known as GHSA-qrch-52m5-vv85.