---
id: CVE-2026-116743
title: >-
  libyal libmsiecf through 20260525 Double Free via
  libmsiecf_url_values_read_data
summary: >-
  libyal libmsiecf through 20260525 contains a double free vulnerability in
  libmsiecf_url_values_read_data() that allows attackers to corrupt heap memory
  via crafted partial URL records. Attackers can supply a crafted MSIE cache
  index.dat …
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-415
vendor: libyal
product: libmsiecf
affected:
  - libmsiecf <= 20260525
published: '2026-10-26'
updated: '2026-10-26'
sourceUpdated: '2026-10-26T21:52:42.185Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-116743'
references:
  - url: 'https://github.com/libyal/libmsiecf/issues/6'
    label: 'GitHub Issue #6'
  - url: 'https://github.com/libyal/libmsiecf'
  - url: >-
      https://github.com/libyal/libmsiecf/commit/a99a703d190d62f6c21b6225cf84ce80037e45d5
  - url: >-
      https://github.com/libyal/libmsiecf/blob/20260525/libmsiecf/libmsiecf_url_values.c#L824
  - url: >-
      https://hackmd.io/@haindpwn/libmsiecf-url-record-partial-recovery-double-free
  - url: >-
      https://www.vulncheck.com/advisories/libyal-libmsiecf-through-20260525-double-free-via-libmsiecf-url-values-read-data
    label: >-
      VulnCheck Advisory: libyal libmsiecf through 20260525 Double Free via
      libmsiecf_url_values_read_data
tags:
  - cve.org
epss: 0.00127
epssPercentile: 0.02326
ingestedAt: '2026-10-27T16:11:59.125Z'
---

## Overview

libyal libmsiecf through 20260525 contains a double free vulnerability in libmsiecf_url_values_read_data() that allows attackers to corrupt heap memory via crafted partial URL records. Attackers can supply a crafted MSIE cache index.dat file whose recovered partial record has an oversized unknown_offset, crashing forensic tools processing it.

## Affected

- `libmsiecf <= 20260525`

## Remediation

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