Out-of-bounds Read in Libyal Libpff
CVE-2026-110598
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@haind-pwn/libpff-multivalue-offset-underflow-oob-read (third-party-advisory)
- github.com/libyal/libpff/blob/03545511ab7a7a609e50ec715bdd3985c3be71c5/libpff/l… (technical-description)
- github.com/libyal/libpff/blob/03545511ab7a7a609e50ec715bdd3985c3be71c5/libpff/l… (technical-description)
- www.vulncheck.com/advisories/libyal-libpff-through-20260926-heap-out-of-bounds-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-110598?
- CVE-2026-110598 is a medium-severity vulnerability in Libyal Libpff, classified under Out-of-bounds Read. CVSS score: 6.1/10. Published 2026-10-14.
- How severe is CVE-2026-110598?
- Medium severity. CVSS v3 base score is 6.1 out of 10.