libyal libfvde up to 20260923 Encrypted Metadata libfvde_encrypted_metadata_read_type_0x0024 xml_plist_data_size heap-based overflow

Summaryinfo

A vulnerability was found in libyal libfvde up to 20260923. It has been classified as critical. This affects the function libfvde_encrypted_metadata_read_type_0x0024 of the component Encrypted Metadata. This manipulation of the argument xml_plist_data_size causes heap-based overflow. This vulnerability is tracked as CVE-2026-116728. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability classified as critical was found in libyal libfvde up to 20260923. Affected by this vulnerability is the function libfvde_encrypted_metadata_read_type_0x0024 of the component Encrypted Metadata. The manipulation of the argument xml_plist_data_size with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

libfvde through 20260923 contains a heap out-of-bounds read vulnerability in libfvde_encrypted_metadata_read_type_0x0024() because xml_plist_data_size is not checked against the source metadata block. Attackers can supply a crafted FileVault 2 Core Storage volume that makes libfvde_volume_open() copy past the heap block buffer, crashing the application.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-116728 since 10/26/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/26/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• libyal

Name

• libfvde

Version

• 20260923

Website

• Product: https://github.com/libyal/libfvde/

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