Read the docs
TI-2026-80952 Aliases CVE-2026-116743GHSA-69hw-fmf2-8wv2

Double free in libyal libmsiecf lets crafted index.dat corrupt memory

Priority MEDIUM 63CWE-415Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-415 and the CVSS impact.

Summary

libyal libmsiecf through 20260525 is affected. A double free in libmsiecf_url_values_read_data() (CWE-415) lets attackers corrupt heap memory through crafted partial URL records. An attacker who supplies a crafted MSIE cache index.dat file with an oversized unknown_offset in a recovered partial record can crash forensic tools that process it.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00127 2nd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
libyallibmsiecfup to 20260525—No fix listedCNA
  • libmsiecf Vendorlibyal Affected up to 20260525 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for libmsiecf.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

Timeline

  1. 2026-10-26 Threatist record created from CVE-2026-116743
  2. 2026-10-27 Alias added: GHSA-69hw-fmf2-8wv2
  3. 2026-10-27 Priority changed: MEDIUM → LOW
  4. 2026-11-05 CISA SSVC decision points changed
  5. 2026-11-05 Priority changed: LOW → MEDIUM

References

Patch 1

Advisory 1

Other 3

  • TI-2026-80946 Heap out-of-bounds read in libphdi extent data file path CVSS 4.0MEDIUM 6.9
  • TI-2026-80944 Heap out-of-bounds read in libpff table record parsing CVSS 4.0MEDIUM 6.9
  • TI-2026-74943 Heap out-of-bounds read in libewf L01 extended attribute parsing CVSS 4.0MEDIUM 6.9
  • TI-2026-74931 Heap out-of-bounds read in libyal libesedb multi-value handling CVSS 4.0MEDIUM 6.9
  • TI-2026-74924 Heap out-of-bounds read in libregf value data parsing CVSS 4.0MEDIUM 6.9
  • TI-2026-74919 libfwsi Heap Out-of-Bounds Read via libfwsi_mtp_volume_values_read_data CVSS 4.0MEDIUM 6.9
See all 14 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences