Out-of-bounds Read in Libyal Libfvde
CVE-2026-116728
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.
Vulnerability class: Buffer Overflow
Published .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/libyal/libfvde/issues/70 (issue-tracking)
- github.com/libyal/libfvde (product)
- github.com/libyal/libfvde/commit/c2676fe49d0da44d66e7d750e72c57d2670f0b8f (patch)
- github.com/libyal/libfvde/blob/20260923/libfvde/libfvde_encrypted_metadata.c (technical-description)
- hackmd.io/@haindpwn/libfvde-encrypted-metadata-oob-read (third-party-advisory)
- www.vulncheck.com/advisories/libfvde-through-20260923-heap-out-of-bounds-read-v… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-116728?
- CVE-2026-116728 is a medium-severity vulnerability in Libyal Libfvde, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2026-10-26.
- How severe is CVE-2026-116728?
- Medium severity. CVSS v3 base score is 5.5 out of 10.