CVE-2026-110598 Libyal libpff through 20260926 heap out-of-bounds read via libpff_record_entry_get_multi_value
Attackers can cause crashes and leak heap memory by crafting malicious PST/OST files with invalid multi-value offsets in libpff.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-110598?
CVE-2026-110598 is a medium-severity vulnerability in libyal libpff, published on 14 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
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.
Weakness: CWE-125
Which versions are affected by CVE-2026-110598?
How do I fix CVE-2026-110598?
No fix has been published for CVE-2026-110598 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-110598 being exploited?
There is no known exploitation of CVE-2026-110598 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-110598, GHSA-9f2v-576g-7mp5, UBUNTU-CVE-2026-110598.