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TI-2026-80938 Aliases CVE-2026-116729GHSA-2f27-2cwc-rp26

Heap out-of-bounds read in libfvde FileVault 2 metadata parsing

Priority MEDIUM 55CWE-125Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · None · Low
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

libyal libfvde through 20260923 contains a heap out-of-bounds read caused by an unbounded strlen on embedded XML plist data (CWE-125). An attacker can supply a crafted FileVault 2 volume with non-NUL-terminated plist data, causing the library to read past the heap block buffer.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00132 2nd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
libyallibfvdeup to 20260923—No fix listedCNA
  • libfvde Vendorlibyal Affected up to 20260923 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for libfvde.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

Timeline

  1. 2026-10-26 Threatist record created from CVE-2026-116729
  2. 2026-10-27 Alias added: GHSA-2f27-2cwc-rp26
  3. 2026-11-02 CISA SSVC decision points changed
  4. 2026-11-02 Priority changed: LOW → MEDIUM

References

Patch 1

Advisory 1

Other 3

  • TI-2026-80946 Heap out-of-bounds read in libphdi extent data file path CVSS 4.0MEDIUM 6.9
  • TI-2026-80944 Heap out-of-bounds read in libpff table record parsing CVSS 4.0MEDIUM 6.9
  • TI-2026-74943 Heap out-of-bounds read in libewf L01 extended attribute parsing CVSS 4.0MEDIUM 6.9
  • TI-2026-74931 Heap out-of-bounds read in libyal libesedb multi-value handling CVSS 4.0MEDIUM 6.9
  • TI-2026-74924 Heap out-of-bounds read in libregf value data parsing CVSS 4.0MEDIUM 6.9
  • TI-2026-74919 libfwsi Heap Out-of-Bounds Read via libfwsi_mtp_volume_values_read_data CVSS 4.0MEDIUM 6.9
See all 14 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences