Vulnerability in libyal libfvde

[ Why it matters ]Priority signals

• Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official 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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• github.com/libyal/libfvde
• github.com/libyal/libfvde/blob/20260923/libfvde/libfvde_encrypted_metadata.c
• github.com/libyal/libfvde/commit/c2676fe49d0da44d66e7d750e72c57d2670f0b8f
• github.com/libyal/libfvde/issues/70
• hackmd.io/@haindpwn/libfvde-encrypted-metadata-oob-read
• www.vulncheck.com/advisories/libfvde-through-20260923-heap-out-of-bounds-read-via-libfv…