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Vulnerability · Published Oct 15, 2026 · Assigned by VulnCheck

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

Medium 6.1

In plain English

A medium-severity out-of-bounds read in libfsapfs from libyal. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities).

Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.2%top 90.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12libfsapfsno fix listedDEBIAN-CVE-2026-111133
Debian:13libfsapfsno fix listedDEBIAN-CVE-2026-111133
Debian:14libfsapfsno fix listedDEBIAN-CVE-2026-111133
Ubuntu:22.04:LTSlibfsapfsno fix listedUBUNTU-CVE-2026-111133
Ubuntu:24.04:LTSlibfsapfsno fix listedUBUNTU-CVE-2026-111133
Ubuntu:26.04:LTSlibfsapfsno fix listedUBUNTU-CVE-2026-111133
Ubuntu:26.10libfsapfsno fix listedUBUNTU-CVE-2026-111133

Affected products (as reported)

VendorProductVersions
libyal libfsapfs 0 – through 20260921

Weakness: CWE-125 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

References