---
id: CVE-2026-110598
title: >-
  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
summary: >-
  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 fi…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H'
cwe:
  - CWE-125
published: '2026-10-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T16:17:41.840'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-110598'
references:
  - url: >-
      https://github.com/libyal/libpff/blob/03545511ab7a7a609e50ec715bdd3985c3be71c5/libpff/libpff_multi_value.c#L207-L271
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/libyal/libpff/blob/03545511ab7a7a609e50ec715bdd3985c3be71c5/libpff/libpff_record_entry.c#L2825-L2874
    label: disclosure@vulncheck.com
  - url: 'https://hackmd.io/@haind-pwn/libpff-multivalue-offset-underflow-oob-read'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/libyal-libpff-through-20260926-heap-out-of-bounds-read-via-libpff-record-entry-get-multi-value
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-14T15:36:14.001Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.