Infinite loop in sharpcompress - #VU166171
Published: November 13, 2026
Vulnerability identifier: #VU166171
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-835
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service through CPU exhaustion and unbounded memory growth.
The vulnerability exists due to missing negative entry-size validation in SharpCompress's seekable TAR parser when enumerating or extracting archive entries, allowing stream rewinding and an infinite loop that retains fabricated entries. A remote attacker can supply a 512-byte TAR with a signed base-256 entry size of -512 to trigger non-terminating enumeration through archive.Entries or WriteToDirectory and exhaust resources.
Affected software
sharpcompress
Remediation
Install security update from vendor's website.
sharpcompress - update to 0.50.9