Vulnerability · Published Oct 14, 2026 · Assigned by VulnCheck
CVE-2026-110598Libyal libpff through 20260926 heap out-of-bounds read via libpff_record_entry_get_multi_value
Medium 6.1
In plain English
A medium-severity out-of-bounds read in libpff from libyal. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 6% of all known vulnerabilities).
Official description
Libyal libpff through 20260926 contains an integer underflow in libpff_record_entry_get_multi_value() that allows attackers to trigger heap out-of-bounds reads via non-monotonic multi-value offsets. Attackers can craft PST, OST or PAB files with decreasing PT_MV_STRING8, PT_MV_UNICODE or PT_MV_BINARY offsets to crash libpff, pypff or pffexport and expose adjacent heap memory.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libpff | no fix listed | DEBIAN-CVE-2026-110598 |
| Debian:13 | libpff | no fix listed | DEBIAN-CVE-2026-110598 |
| Debian:14 | libpff | no fix listed | DEBIAN-CVE-2026-110598 |
| Ubuntu:22.04:LTS | libpff | no fix listed | UBUNTU-CVE-2026-110598 |
| Ubuntu:24.04:LTS | libpff | no fix listed | UBUNTU-CVE-2026-110598 |
| Ubuntu:26.04:LTS | libpff | no fix listed | UBUNTU-CVE-2026-110598 |
| Ubuntu:26.10 | libpff | no fix listed | UBUNTU-CVE-2026-110598 |
Affected products (as reported)
Weakness: CWE-125 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
References
- https://hackmd.io/@haind-pwn/libpff-multivalue-offset-underflow-oob-read third-party-advisory
- https://github.com/libyal/libpff/blob/03545511ab7a7a609e50ec715bdd3985c3be71c5/libpff/libpff_record_entry.c#L2825-L2874 technical-description
- https://github.com/libyal/libpff/blob/03545511ab7a7a609e50ec715bdd3985c3be71c5/libpff/libpff_multi_value.c#L207-L271 technical-description
- VulnCheck Advisory: Libyal libpff through 20260926 heap out-of-bounds read via libpff_record_entry_get_multi_value third-party-advisory