# CVE-2026-116737: libphdi heap out-of-bounds read in directory prefix handling

Source: https://junglewise.ai/threats/cve-2026-116737-libphdi-through-20260902-contains-a-heap-out-of-bounds-read  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-26. Updated: 2026-10-26  
License: CC BY 4.0 with a link back

CVE-2026-116737 · Severity: medium · CVSS 6.1 · Published 2026-10-26

libphdi is a library for reading Parallels disk image files, used by virtual machine software and forensic tools. A crafted disk image can trigger a memory read beyond allocated bounds, potentially crashing applications or leaking sensitive data from adjacent memory.

Vendors: [Libyal](https://junglewise.ai/threats/vendors/libyal).

## Quick answers

**Is CVE-2026-116737 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-116737 being exploited in the wild.

**How severe is CVE-2026-116737?** Medium severity, with a CVSS score of 6.1, published 26 October 2026.

**Which products and versions are affected?** Libyal Libphdi through 20260902.

**Is there a fix for CVE-2026-116737?** 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-2026-116737 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-116737?** Check whether you run Libyal Libphdi 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

The libphdi_data_files_get_extent_data_file_path function uses the directory prefix length instead of the basename length when reading extent file paths, resulting in a heap out-of-bounds read. An attacker can construct a Parallels disk image descriptor with a long directory prefix and short basename to trigger the vulnerability via network or local file access. This may cause a denial of service or information disclosure.

## Affected products

- libyal libphdi through 20260902

## Timeline

- 2026-10-26: disclosed

## References

- [https://github.com/libyal/libphdi](https://github.com/libyal/libphdi)
- [https://github.com/libyal/libphdi/blob/20260902/libphdi/libphdi_data_files.c](https://github.com/libyal/libphdi/blob/20260902/libphdi/libphdi_data_files.c)