Medium severity · published Oct 14, 2026
CVE-2026-110598
Libyal libpff through 20260926 heap out-of-bounds read via libpff_record_entry_get_multi_value
6.1
CVSS
0.2%
EPSS
No
On KEV
Description
Libyal libpff through 20260926 contains an integer underflow in libpff_record_entry_get_multi_value() that allows attackers to trigger heap out-of-bounds reads via non-monotonic multi-value offsets. Attackers can craft PST, OST or PAB files with decreasing PT_MV_STRING8, PT_MV_UNICODE or PT_MV_BINARY offsets to crash libpff, pypff or pffexport and expose adjacent heap memory.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 6% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
libpff · libyal
through 20260926 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-110598
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-110598
third-party-advisory
https://hackmd.io/@haind-pwn/libpff-multivalue-offset-underflow-oob-read
technical-description
https://github.com/libyal/libpff/blob/03545511ab7a7a609e50ec715bdd3985c3be71c5/libpff/libpff_record_entry.c#L2825-L2874
technical-description
https://github.com/libyal/libpff/blob/03545511ab7a7a609e50ec715bdd3985c3be71c5/libpff/libpff_multi_value.c#L207-L271
third-party-advisory
https://www.vulncheck.com/advisories/libyal-libpff-through-20260926-heap-out-of-bounds-read-via-libpff-record-entry-get-multi-value
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