CVE-2026-6533
Wireshark: Wireshark: Denial of service via LZ77 decompression crash
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · April 30, 2026
Updated · July 3, 2026
Description
A flaw was found in Wireshark. A remote attacker could exploit a dissection engine LZ77 decompression crash by crafting a malicious packet. This vulnerability leads to a Denial of Service (DoS) condition, making the application unavailable.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
To mitigate this issue, users should avoid opening untrusted or suspicious packet capture files with Wireshark. Running Wireshark in a sandboxed environment can further limit the potential impact of processing malicious data.
CVSS / CWE
CVSS 3.1 · 6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CWE-409 · Improper Handling of Highly Compressed Data (Data Amplification)