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TI-2026-74917 Aliases CVE-2026-111133

Heap out-of-bounds read in libfsapfs encrypted key handling

Priority MEDIUM 64CWE-125Published · Updated

Key facts

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

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

Summary

libfsapfs through 20260921 contains an integer underflow in libfsapfs_key_encrypted_key_read_data() that causes heap out-of-bounds reads (CWE-125). An attacker who supplies a crafted encrypted APFS image with malformed attribute lengths can crash tools that use the library, such as fsapfsinfo, pyfsapfs, dfVFS or plaso, and read adjacent heap memory before password checks. Exploitation requires passive user interaction.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

libfsapfs through 20260921 contains an integer underflow in libfsapfs_key_encrypted_key_read_data() that allows attackers to trigger heap out-of-bounds reads via crafted KEK attributes. Attackers can supply a crafted encrypted APFS image with malformed HMAC or wrapped KEK attribute lengths to crash fsapfsinfo, pyfsapfs, dfVFS or plaso and read adjacent heap memory before password checks.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00197 9th 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
libyallibfsapfsup to 20260921—No fix listedCNA
  • libfsapfs Vendorlibyal Affected up to 20260921 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for libfsapfs.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Timeline

  1. 2026-10-16 Threatist record created from CVE-2026-111133

References

Other 4

  • 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