Description
libfvde through 20260923 contains a heap out-of-bounds read vulnerability in libfvde_encrypted_metadata_read_type_0x001a() caused by an unbounded strlen on embedded XML plist data. Attackers can supply a crafted FileVault 2 volume with non-NUL-terminated plist data, causing libfvde_volume_open() to read past the heap block buffer.
References7
- github.com/libyal/libfvde
- github.com/libyal/libfvde/blob/20260923/libfvde/libfvde_encrypt…
- github.com/libyal/libfvde/commit/c2676fe49d0da44d66e7d750e72c57…
- github.com/libyal/libfvde/issues/70
- hackmd.io/@haindpwn/libfvde-encrypted-metadata-oob-read
- www.vulncheck.com/advisories/libfvde-through-20260923-heap-out-…
- hackmd.io/@haindpwn/libfvde-encrypted-metadata-oob-read
Metrics
- CVSS 3.1
-
3.3
LOW
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L - CVSS 4.0
-
4.8
MEDIUM
Score source: CNA
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 0% percentile: 3 · as of 8 November 2026
- CWE
- CWE-125
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.