# CVE-2026-116736: Libpff heap out-of-bounds read in table parsing

Source: https://junglewise.ai/threats/cve-2026-116736-libpff-through-20260926-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-2026-116736 · Severity: medium · CVSS 6.1 · Published 2026-10-26

Libpff is a library used by forensic tools and email applications to read Outlook PST, OST, and PAB files. A flaw in how it validates column definitions when reading table data allows attackers to craft malicious files that cause the library to read adjacent heap memory, potentially leaking sensitive data or crashing applications that use the library.

Technologies: [Libyal Libpff](https://junglewise.ai/threats/technologies/libpff). Vendors: [Libyal](https://junglewise.ai/threats/vendors/libyal).

## Quick answers

**Is CVE-2026-116736 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-116736 being exploited in the wild.

**How severe is CVE-2026-116736?** Medium severity, with a CVSS score of 6.1, published 26 October 2026.

**Which products and versions are affected?** Libyal Libpff through 20260926.

**Is there a fix for CVE-2026-116736?** 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-2026-116736 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-116736?** Check whether you run Libyal Libpff 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 vulnerability is a heap out-of-bounds read in libpff_table_read_values_array caused by insufficient validation of a column definition's values_array_size field against the remaining buffer bytes. An attacker can supply a crafted PST, OST, or PAB file with a 7c column definition that specifies an array size larger than the available data, causing out-of-bounds heap access. No authentication or user interaction beyond opening the malicious file is required.

## Affected products

- libyal libpff through 20260926

## Timeline

- 2026-10-26: disclosed

## References

- [https://github.com/libyal/libpff](https://github.com/libyal/libpff)
- [https://github.com/libyal/libpff/blob/20260926/libpff/libpff_table.c](https://github.com/libyal/libpff/blob/20260926/libpff/libpff_table.c)

## Related threats

- [libpff off-by-one heap buffer read in table record parsing](https://junglewise.ai/threats/cve-2026-116735-libpff-through-20260926-contains-an-off-by-one-bounds-check-in)
- [libyal libpff integer underflow in record entry parsing](https://junglewise.ai/threats/cve-2026-110598-libyal-libpff-through-20260926-contains-an-integer-underflow-in)