CVE-2024-24754: Bref Body Parsing Inconsistency in Event-Driven Functions

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2024-02-01 · updated 2026-06-17
Weakness: CWE-436

Description

Bref enable serverless PHP on AWS Lambda. When Bref is used with the Event-Driven Function runtime and the handler is a `RequestHandlerInterface`, then the Lambda event is converted to a PSR7 object. During the conversion process, if the request is a MultiPart, each part is parsed and its content added in the `$files` or `$parsedBody` arrays. The conversion process produces a different output compared to the one of plain PHP when keys ending with and open square bracket ([) are used. Based on the application logic the difference in the body parsing might lead to vulnerabilities and/or undefined behaviors. This vulnerability is patched in 2.1.13.

Affected products

brefphp bref: before 2.1.13 — fixed in 2.1.13

How to fix

Upgrade to a fixed version: brefphp bref 2.1.13. Check the vendor advisory for mitigations.

References

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