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.
References7
- github.com/libyal/libmsiecf
- github.com/libyal/libmsiecf/blob/20260525/libmsiecf/libmsiecf_u…
- github.com/libyal/libmsiecf/commit/a99a703d190d62f6c21b6225cf84…
- github.com/libyal/libmsiecf/issues/6
- hackmd.io/@haindpwn/libmsiecf-url-record-partial-recovery-doubl…
- www.vulncheck.com/advisories/libyal-libmsiecf-through-20260525-…
- hackmd.io/@haindpwn/libmsiecf-url-record-partial-recovery-doubl…
Metrics
- CVSS 3.1
-
5.5
MEDIUM
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - CVSS 4.0
-
6.8
MEDIUM
Score source: CNA
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 0% percentile: 2 · as of 8 November 2026
- CWE
- CWE-415
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.