CVE-2026-116729
libfvde through 20260923 Heap Out-of-Bounds Read via libfvde_encrypted_metadata_read_type_0x001a
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 and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: VulnCheckAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| libfvde libyal libyal/libfvde
github |
≥ 0; ≤ 20260923 (affected, custom)
Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 4.8 medium |
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 | CNA: VulnCheck |
| 3.1 / 3.3 low |
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L | CNA: VulnCheck |
Exploit evidence
- https://hackmd.io/@haindpwn/libfvde-encrypted-metadata-oob-read
exploit · ADP: CISA-ADP
References
- https://github.com/libyal/libfvde/issues/70CNA: VulnCheck · issue-tracking
- https://github.com/libyal/libfvdeCNA: VulnCheck · product
- https://github.com/libyal/libfvde/commit/c2676fe49d0da44d66e7d750e72c57d2670f0b8fCNA: VulnCheck · patch
- https://github.com/libyal/libfvde/blob/20260923/libfvde/libfvde_encrypted_metadata.c#L2786-L2792CNA: VulnCheck · technical-description
- https://hackmd.io/@haindpwn/libfvde-encrypted-metadata-oob-readCNA: VulnCheck · third-party-advisory
- https://www.vulncheck.com/advisories/libfvde-through-20260923-heap-out-of-bounds-read-via-libfvde-encrypted-metadata-read-type-0x001aCNA: VulnCheck · third-party-advisory
- https://hackmd.io/@haindpwn/libfvde-encrypted-metadata-oob-readADP: CISA-ADP · exploit
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