Is CVE-2026-116743 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-116743 being exploited in the wild.

How severe is CVE-2026-116743?

Medium severity, with a CVSS score of 5.5, published 26 October 2026.

Which products and versions are affected?

Libyal Libmsiecf through 20260525.

Is there a fix for CVE-2026-116743?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-116743 attacked?

It is attacked with local access, in a software library.

Am I affected by CVE-2026-116743?

Check whether you run Libyal Libmsiecf at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-116743: libyal libmsiecf double free in URL values parser

CVE-2026-116743 · Severity: medium · CVSS 5.5 · Published 2026-10-26

libmsiecf is a library that reads Microsoft Internet Explorer cache files (index.dat) used by forensic analysts and security tools. A double-free vulnerability in the URL parsing code allows an attacker to crash these tools or corrupt memory by providing a malicious cache file with oversized offset values in partial URL records.

Vendors: Libyal.

Quick answers

Is CVE-2026-116743 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-116743 being exploited in the wild.
How severe is CVE-2026-116743?: Medium severity, with a CVSS score of 5.5, published 26 October 2026.
Which products and versions are affected?: Libyal Libmsiecf through 20260525.
Is there a fix for CVE-2026-116743?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-116743 attacked?: It is attacked with local access, in a software library.
Am I affected by CVE-2026-116743?: Check whether you run Libyal Libmsiecf at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A double-free vulnerability exists in the libmsiecf_url_values_read_data() function that processes partial URL records from MSIE cache index.dat files. An attacker can craft a malicious cache file with an oversized unknown_offset field that triggers the double-free condition, leading to heap memory corruption. This vulnerability requires the victim to process a crafted index.dat file, resulting in denial of service to forensic tools.

Affected products

libyal libmsiecf through 20260525

Timeline

2026-10-26: disclosed

References

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