CVE-2026-6533 Details
Description
Dissection engine LZ77 decompression crash in Wireshark 4.6.0 to 4.6.4 and 4.4.0 to 4.4.14 allows denial of service
A denial-of-service vulnerability has been identified in Wireshark versions 4.6.0 to 4.6.4 and 4.4.0 to 4.4.14. The issue arises in the dissection engine's LZ77 decompression process, where the decompressor can enter a loop of approximately 4.29 billion iterations. This flaw is triggered by a crafted SMB2 Compression Transform Header that exploits the decompressor's lack of output size limitations, leading to excessive CPU consumption and causing Wireshark to crash.
Users can upgrade to Wireshark versions 4.6.5, 4.4.15 or later to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 30, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://gitlab.com/wireshark/wireshark/-/work_items/21127 | CISA-ADP | ExploitIssue TrackingThird Party Advisory |
| https://gitlab.com/wireshark/wireshark/-/issues/21127 | [email protected] | ExploitIssue TrackingThird Party Advisory |
| https://www.wireshark.org/security/wnpa-sec-2026-28.html | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-1325 | Improperly Controlled Sequential Memory Allocation | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| wireshark wireshark | >= 4.4.0, <= 4.4.14 >= 4.6.0, <= 4.6.4 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 1, 2026 | Initial Analysis | [email protected] |
| Apr 30, 2026 | CVE Modified | CISA-ADP |
| Apr 30, 2026 | New CVE Received | [email protected] |