Out-of-bounds read in rarfile - #VU164405
Published: November 10, 2026
Vulnerability identifier: #VU164405
CSH Severity: Low
CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to potentially cause a denial of service by crashing an application processing a crafted RAR3 archive.
The vulnerability exists due to missing bounds checks in rarfile's RAR3Parser._parse_subblocks and RAR3Parser._load_comment functions when parsing comment lengths that exceed the available header buffer. A remote attacker can trick a victim into processing an archive containing malformed comment sub-blocks to trigger an out-of-bounds read or crash.
Affected software
rarfile
Remediation
Install security update from vendor's website.
rarfile - update to 4.5