Medium severity · published Oct 26, 2026
CVE-2026-116743
libyal libmsiecf through 20260525 Double Free via libmsiecf_url_values_read_data
New
5.5
CVSS
0.1%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 2% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
libmsiecf · libyal
through 20260525 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-116743
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-116743
github.com
https://github.com/libyal/libmsiecf
github.com
https://github.com/libyal/libmsiecf/blob/20260525/libmsiecf/libmsiecf_url_values.c#L824
github.com
https://github.com/libyal/libmsiecf/commit/a99a703d190d62f6c21b6225cf84ce80037e45d5
github.com
https://github.com/libyal/libmsiecf/issues/6
hackmd.io
https://hackmd.io/@haindpwn/libmsiecf-url-record-partial-recovery-double-free
www.vulncheck.com
https://www.vulncheck.com/advisories/libyal-libmsiecf-through-20260525-double-free-via-libmsiecf-url-values-read-data