What’s Vulnerable › Vulnerabilities

CVE-2026-116743: libyal libmsiecf through 20260525 Double Free via libmsiecf_url_values_read_data

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-26 · updated 2026-10-27
• Weakness: CWE-415

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.

Affected products

• libyal libmsiecf: through 20260525

References

• https://github.com/libyal/libmsiecf
• https://github.com/libyal/libmsiecf/blob/20260525/libmsiecf/libmsiecf_url_values.c#L824
• https://github.com/libyal/libmsiecf/commit/a99a703d190d62f6c21b6225cf84ce80037e45d5
• https://github.com/libyal/libmsiecf/issues/6
• https://hackmd.io/@haindpwn/libmsiecf-url-record-partial-recovery-double-free
• https://www.vulncheck.com/advisories/libyal-libmsiecf-through-20260525-double-free-via-libmsiecf-url-values-read-data

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