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.
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
Passive
Minimal interaction
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 6
https://github.com/libyal/libmsiecf
disclosure@vulncheck.com
https://github.com/libyal/libmsiecf/blob/20260525/libmsiecf/libmsiecf_url_value…
disclosure@vulncheck.com
https://github.com/libyal/libmsiecf/commit/a99a703d190d62f6c21b6225cf84ce80037e…
disclosure@vulncheck.com
https://github.com/libyal/libmsiecf/issues/6
disclosure@vulncheck.com
https://hackmd.io/@haindpwn/libmsiecf-url-record-partial-recovery-double-free
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/libyal-libmsiecf-through-20260525-double-f…
disclosure@vulncheck.com