CVE-2026-42494: 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-2026-42494?
CVE-2026-42494 has a risk rating of 57, indicating a moderate severity level.
How do I fix CVE-2026-42494?
To fix CVE-2026-42494, update the libfsimage software to the latest version that addresses the buffer overrun vulnerabilities.
What software is affected by CVE-2026-42494?
CVE-2026-42494 affects the libfsimage library, specifically its iso9660 handling functionality.
What types of vulnerabilities does CVE-2026-42494 involve?
CVE-2026-42494 involves buffer overruns caused by inadequate validation of input lengths derived from on-disk fields.
Can CVE-2026-42494 be exploited remotely?
Yes, CVE-2026-42494 can potentially be exploited remotely if an attacker can control the iso9660 formatted disk images processed by the libfsimage library.