CVE-2026-42495: buffer overruns in libfsimage iso9660 handling
[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.]
The directory and Rock Ridge / SUSP walk in libfsimage's iso9660 driver derives several lengths directly from attacker-controlled on-disk fields without validating them:
The directory loop itself assumes a good record length. This is CVE-2026-42494.
The calculation of the System Use area may underflow. This is CVE-2026-42495.
The Rock Ridge extension loop assumes a good (inner) record length. This is CVE-2026-62423.
The Rock Ridge NM record processing assumes a good entry length. This is CVE-2026-62424.
The Rock Ridge CE record processing assumes a good size and offset. This is CVE-2026-62425.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-42495?
CVE-2026-42495 has a risk score of 57, indicating a moderate level of severity.
What causes CVE-2026-42495?
CVE-2026-42495 is caused by buffer overruns in libfsimage's iso9660 handling due to the use of unvalidated attacker-controlled fields.
How do I fix CVE-2026-42495?
To fix CVE-2026-42495, it is recommended to update libfsimage to the latest version that addresses this vulnerability.
Which software is affected by CVE-2026-42495?
CVE-2026-42495 affects the libfsimage iso9660 driver and its handling of iso9660 file formats.
What are the potential impacts of CVE-2026-42495?
The potential impacts of CVE-2026-42495 include arbitrary code execution and system compromise due to buffer overrun vulnerabilities.