CVE-2026-111133 Details
Description
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.
A heap out-of-bounds read vulnerability has been identified in libfsapfs, a library for accessing the Apple File System (APFS). This vulnerability, present in versions through 20260921, arises from an integer underflow in the function libfsapfs_key_encrypted_key_read_data(). Attackers can exploit this flaw by crafting KEK attributes within an encrypted APFS image, leading to heap out-of-bounds reads. The exploitation can cause the tools fsapfsinfo, pyfsapfs, dfVFS, or plaso to crash, while also allowing the attacker to read adjacent heap memory before any password checks are performed.
Users can update to the latest version of libfsapfs, where this vulnerability has been fixed. The specific commit addressing the issue is available on the libfsapfs GitHub repository.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 15, 2026CISA-ADP
Assessed Oct 15, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-125 | Out-of-bounds Read | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| libfsapfs | <= 20260921 |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 15, 2026 | CVE Modified | CISA-ADP |
| Oct 15, 2026 | New CVE Received | [email protected] |