Double Free in Libyal Libmsiecf
CVE-2026-116743
libyal libmsiecf through 20260525 contains a double free vulnerability in libmsiecf_url_values_read_data() that allows attackers to corrupt heap memory via crafted partial URL records. Attackers can supply a crafted MSIE cache index.dat file whose recovered partial record has an oversized unknown_offset, crashing forensic tools processing it.
Vulnerability class: Double Free
Published .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/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
- github.com/libyal/libmsiecf/issues/6 (issue-tracking)
- github.com/libyal/libmsiecf (product)
- github.com/libyal/libmsiecf/commit/a99a703d190d62f6c21b6225cf84ce80037e45d5 (patch)
- github.com/libyal/libmsiecf/blob/20260525/libmsiecf/libmsiecf_url_values.c (technical-description)
- hackmd.io/@haindpwn/libmsiecf-url-record-partial-recovery-double-free (third-party-advisory)
- www.vulncheck.com/advisories/libyal-libmsiecf-through-20260525-double-free-via-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-116743?
- CVE-2026-116743 is a medium-severity vulnerability in Libyal Libmsiecf, classified under Double Free. CVSS score: 5.5/10. Published 2026-10-26.
- How severe is CVE-2026-116743?
- Medium severity. CVSS v3 base score is 5.5 out of 10.