Wireshark 4.6.4 fixes a USB HID dissector flaw that could make the packet analyzer consume excessive memory when it processes malformed packets or capture files. Wireshark’s February 25, 2026 advisory identifies versions 4.6.0–4.6.3 and 4.4.0–4.4.13 as affected; the minimum fixes are 4.6.4 and 4.4.14, respectively. If you use an affected version, update Wireshark—preferably to the newest supported release for your operating system.
What Wireshark 4.6.4 fixes
Wireshark 4.6.4 addresses a memory-exhaustion vulnerability in the USB HID protocol dissector. The issue is tracked as wnpa-sec-2026-05, CVE-2026-3201, and Wireshark issue 20972. The project’s security advisory describes the impact: “The USB HID protocol dissector could exhaust system memory.”
This is a software vulnerability in Wireshark’s handling of USB Human Interface Device (HID) traffic, not a defect in a USB cable, HID device, or capture adapter. The 4.6.4 release notes list this fix alongside two other dissector security fixes.
Which Wireshark versions are affected?
The advisory, dated February 25, 2026, gives the affected and fixed versions below.
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| Wireshark branch | Affected versions | Minimum fixed version |
|---|---|---|
| 4.6.x | 4.6.0 through 4.6.3 | 4.6.4 |
| 4.4.x | 4.4.0 through 4.4.13 | 4.4.14 |
Wireshark 4.6.4 is the release that introduced the fix on the 4.6 branch; it is not the required version for users staying on the 4.4 branch. For either branch, the advisory recommends upgrading to the applicable fixed release or later.
How malformed traffic can exhaust memory
The advisory says an attacker may be able to trigger excessive memory use by injecting a malformed packet onto the network or by persuading someone to open a capture file containing a malformed packet. This makes untrusted packet captures a relevant risk even when you are not actively capturing live traffic.
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Wireshark reported that it was unaware of exploits for this issue when the advisory was published. That statement reflects the advisory’s publication date; it does not establish whether exploitation has occurred since then.
What to do if you use an affected version
- Check your installed version. In Wireshark, open Help > About Wireshark on Windows or Linux. On macOS, open Wireshark > About Wireshark. Confirm the version shown in the About window.
- Update the affected branch or move to a newer supported release. If you have 4.6.0–4.6.3, install at least 4.6.4; if you have 4.4.0–4.4.13, install at least 4.4.14. The security index lists later maintenance releases carrying the fix, including 4.6.9 and 4.4.19 as of October 1, 2026. Prefer the newest supported Wireshark release available for your operating system.
- Until updated, be cautious with untrusted captures. Avoid opening packet trace files from untrusted sources in an affected installation. The advisory also identifies malformed packets received over the network as a possible trigger.
The remedy is a Wireshark software update. Replacing USB hardware or changing capture equipment does not address the vulnerable dissector.
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Do you need to upgrade from Wireshark 4.6.3?
Yes. Version 4.6.3 is within the advisory’s affected range, so upgrade to at least 4.6.4. Because later maintenance releases include the fix, choose the newest supported version available for your operating system rather than stopping at the minimum version if a newer supported release is offered.
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