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CVE-2026-111133— libfsapfs through 20260921 Heap Out-of-Bounds Read via libfsapfs_key_encrypted_key_read_data

Quick assessment

Affected
libyal libfsapfs
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 libfsapfs 20260921 及之前版本中，libfsapfs_key_encrypted_key_read_data() 函数存在整数下溢漏洞。攻击者可以通过构造恶意的 KEK（密钥加密密钥）属性，触发堆缓冲区越界读取。 攻击者可以提供一个构造的、包含格式错误的 HMAC 或包装 KEK 属性长度的加密 APFS 镜像，从而在密码检查之前导致 fsapfsinfo、pyfsapfs、dfVFS 或 plaso 程序崩溃，并读取相邻的堆内存内容。

CVSS 6.1 · Medium EPSS 0.20% · P9

Affected Version Matrix 1

VendorProduct Version RangeStatus
libyal libfsapfs ≤ 20260921 affected
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I. Basic Information for CVE-2026-111133

Vulnerability Information
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Vulnerability Title
libfsapfs through 20260921 Heap Out-of-Bounds Read via libfsapfs_key_encrypted_key_read_data
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
libyal libfsapfs 0 ~ 20260921 -

II. Public POCs for CVE-2026-111133

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III. Intelligence Information for CVE-2026-111133

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Vendor Advisories for CVE-2026-111133 (1)

News Coverage for CVE-2026-111133 (1)

Same Patch Batch · libyal · 2026-10-15 · 6 CVEs total

CVE-2026-111159 6.1 MEDIUM libewf through 20260924 Heap Out-of-Bounds Read via L01 Extended Attribute Parsing
CVE-2026-111140 6.1 MEDIUM libregf through 20260526 Heap Out-of-Bounds Read via libregf_value_item_read_value_data
CVE-2026-111147 6.1 MEDIUM Libyal libesedb through 20260704 Heap Out-of-Bounds Read via libesedb_record_get_multi_val
CVE-2026-111135 6.1 MEDIUM libfwsi through 20260522 Heap Out-of-Bounds Read via libfwsi_mtp_volume_values_read_data
CVE-2026-111134 6.1 MEDIUM libfwsi through 20260522 Heap Out-of-Bounds Read via libfwsi_mtp_file_entry_values_read_da

IV. Related Vulnerabilities

Same vendor: libyal
Same weakness: CWE-125

V. Comments for CVE-2026-111133

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