# Wireshark 4.6.4 Release Notes

## What is Wireshark?

Wireshark is the world’s most popular network protocol analyzer. It is used for troubleshooting, analysis, development and education.

Wireshark is hosted by the Wireshark Foundation, a nonprofit which promotes protocol analysis education. Wireshark and the foundation depend on your contributions in order to do their work. If you or your organization would like to contribute or become a sponsor, please visit wiresharkfoundation.org.

If you use Wireshark professionally or you just want to learn more about protocol analysis, you should join us at SharkFest, the Wireshark developer and user conference.

You can also become a Wireshark Certified Analyst! Official Wireshark training and certification are available from the Wireshark Foundation.

## What’s New

### Bug Fixes

- wnpa-sec-2026-05 USB HID dissector memory exhaustion. Issue 20972. CVE-2026-3201.

- wnpa-sec-2026-06 NTS-KE dissector crash. Issue 21000. CVE-2026-3202.

- wnpa-sec-2026-07 RF4CE Profile dissector crash. Issue 21009. CVE-2026-3203.

The following bugs have been fixed:

- Wireshark doesn’t start if Npcap is configured with "Restrict Npcap driver’s Access to Administrators only" Issue 20828.

- PQC signature algorithm not reported in signature_algorithms. Issue 20953.

- Unexpected JA4 ALPN values when space characters sent. Issue 20966.

- Expert Info seems to have quadratic performance (gets slower and slower) Issue 20970.

- IKEv2 EMERGENCY_CALL_NUMBERS Notify payload cannot be decoded. Issue 20974.

- TShark and editcap fails with segmentation fault when output format (-F) set to blf. Issue 20976.

- Fuzz job crash: fuzz-2026-02-01-12944805400.pcap [Zigbee Direct Tunneling Zigbee NWK PDUs NULL hash table] Issue 20977.

- Wiretap writes pcapng custom options with string values invalidly. Issue 20978.

- RDM status in Output Status (GoodOutputB) field incorrectly decoded in Art-Net PollReply dissector. Issue 20980.

- Wiretap writes invalid pcapng Darwin option blocks. Issue 20991.

- TDS dissector desynchronizes on RPC DATENTYPE (0x28) due to incorrect expectation of TYPE_VARLEN (MaxLen) Issue 21001.

- Only first HTTP POST is parsed inside SOCKS with "Decode As". Issue 21006.

- TShark: Bogus "Dissector bug" messages generated in pipelines where something after tshark exits before reading all its input. Issue 21011.

- New Diameter RAT-Types in TS 29.212 not decoded. Issue 21012.

- Malformed packet error on Trigger HE Basic frames. Issue 21032.

### New Protocol Support

There are no new protocols in this release.

### Updated Protocol Support

Art-Net, AT, BGP, GSM DTAP, GSM SIM, IEEE 802.11, IPv6, ISAKMP, MBIM, MySQL, NAS-5GS, NTS-KE, SGP.22, Silabs DCH, Socks, TDS, TECMP, USB HID, ZB TLV, and ZBD

### New and Updated Capture File Support

BLF, pcapng, and TTL

### New and Updated File Format Decoding Support

There is no new or updated file format support in this release.

## Prior Versions

Wireshark 4.6.3 included the following changes. See the release notes for details:

- wnpa-sec-2026-01 BLF file parser crash. Issue 20880.

- wnpa-sec-2026-02 IEEE 802.11 dissector crash. Issue 20939.

- wnpa-sec-2026-03 SOME/IP-SD dissector crash. Issue 20945.

- wnpa-sec-2026-04 HTTP3 dissector infinite loop. Issue 20944.

- Wireshark 4.6.0 build fails on Solaris: pcapio.c:441:21: error: request for member '_flag' in something not a structure or union. Issue 20773.

- RTP Player streams cannot be stopped. Issue 20879.

- Additional ABI/API compatibility fixes. Issue 20881.

- Missing data in pinfo→cinfo in HomePlug message CM_ATTEN_CHAR.IND. Issue 20893.

- maxmind_db: crash when switching from a profile where it’s disabled to one where it’s enabled. Issue 20903.

- Compilation warning or error if CFLAGS defines _FORTIFY_SOURCE to other than 3 without first undefining it. Issue 20904.

- IEEE 802.11: Incorrect parsing of QoS and Mesh Control Field when the frame body contains an A-MSDU. Issue 20905.

- OSS-Fuzz 473164101: Heap-buffer-overflow in dissect_idn_laser_data. Issue 20936.

- Bug in decoding 5G NAS message - Extended CAG information list IE. Issue 20946.

Wireshark 4.6.2 included the following changes. See the release notes for details:

This release fixes an API/ABI change that was introduced in Wireshark 4.6.1, which caused a compatibility issue with plugins built for Wireshark 4.6.0. Issue 20881.

- wnpa-sec-2025-07 HTTP3 dissector crash. Issue 20860.

- wnpa-sec-2025-08 MEGACO dissector infinite loop. Issue 20884.

- ws_base32_decode should be named *_encode ? Issue 20754.

- Omnipeek files not working in 4.6.1. Issue 20876.

- Stack buffer overflow in wiretap/ber.c (ber_open) Issue 20878.

- Plugins incompatibility between 4.6.0 & 4.6.1. Issue 20881.

- Fuzz job crash: fuzz-2025-11-30-12266121180.pcap. Issue 20883.

- The Windows installers now ship with the Visual C++ Redistributable version 14.44.35112. They previously shipped with 14.40.33807.

Wireshark 4.6.1 included the following changes. See the release notes for details:

- wnpa-sec-2025-05 BPv7 dissector crash. Issue 20770.

- wnpa-sec-2025-06 Kafka dissector crash. Issue 20823.

- L2CAP dissector doesn’t understand retransmission mode. Issue 2241.

- DNS HIP dissector labels PK algorithm as HIT length. Issue 20768.

- clang-cl error in "packet-zbee-direct.c" Issue 20776.

- Writing to an LZ4-compressed output file might fail. Issue 20779.

- endian.h conflics with libc for building plugins. Issue 20786.

- TShark crash caused by Lua plugin. Issue 20794.

- Wireshark stalls for a few seconds when selecting specific messages. Issue 20797.

- TLS Abbreviated Handshake Using New Session Ticket. Issue 20802.

- Custom websocket dissector does not run. Issue 20803.

- WINREG QueryValue triggers dissector bug in packet-dcerpc.c. Issue 20813.

- Lua: FileHandler causing crash when reading packets. Issue 20817.

- Apply As Filter for field with FT_NONE and BASE_NONE for a single byte does not use the hex value. Issue 20818.

- Layout preference Pane 3 problem with selecting Packet Diagram or None. Issue 20819.

- TCP dissector creates invalid packet diagram. Issue 20820.

- Too many nested VLAN tags when opening as File Format. Issue 20831.

- Omnipeek files not working in 4.6.0. Issue 20842.

- Support UTF-16 strings in the IsoBus dissector for the string operations. Issue 20845.

- SNMP getBulkRequest request-id does not get filtered for correctly. Issue 20849.

- Fuzz job issue: fuzz-2025-11-12-12064814316.pcap. Issue 20852.

- UDP Port 853 (DoQ) should be decoded as QUIC. Issue 20856.

Wireshark 4.6.0 included the following changes. See the release notes for details:

Wireshark can dissect process information, packet metadata, flow IDs, drop information, and other information provided by `tcpdump` on macOS.

We now ship universal macOS installers instead of separate packages for Arm64 and Intel. Issue 17294

WinPcap is no longer supported. On Windows, use Npcap instead, uninstalling WinPcap if necessary. The final release of WinPcap was version 4.1.3 in 2013. It only supports up to Windows 8, which is no longer supported by Microsoft or Wireshark.

A new “Plots” dialog has been added, which provides scatter plots in contrast to the “I/O Graphs” dialog, which provides histograms. The Plots dialog window supports multiple plots, markers, and automatic scrolling.

Live captures can be compressed while writing. (Previously there was support for compressing when performing multiple file capture, at file rotation time.) The `--compress` option in TShark works on live captures as well. Issue 9311

Wireshark can now decrypt NTP packets using NTS (Network Time Security). To decrypt packets, the NTS-KE (Network Time Security Key Establishment Protocol) packets need to be present, alongside the TLS client and exporter secrets.

Wireshark’s ability to decrypt MACsec packets has been expanded to either use the SAK unwrapped by the MKA dissector, or the PSK configured in the MACsec dissector.

The TCP Stream Graph axes now use units with SI prefixes. Issue 20197

Display filter functions `float` and `double` are added to allow explicitly converting field types like integers and times to single and double precision floats.

A Edit › Copy › as HTML menu item has been added, along with associated context menu items and a keyboard shortcut.

The Conversations and Endpoints dialogs have an option to display byte counts and bit rates in exact counts instead of human-readable numbers with SI units.

The color scheme can be set to Light or Dark mode independently of the current OS default on Windows and macOS, if Wireshark is built with Qt 6.8 or later as the official installers are. Issue 19328

## Getting Wireshark

Wireshark source code and installation packages are available from https://www.wireshark.org/download.html.

### Vendor-supplied Packages

Most Linux and Unix vendors supply their own Wireshark packages. You can usually install or upgrade Wireshark using the package management system specific to that platform. A list of third-party packages can be found on the download page on the Wireshark web site.

## File Locations

Wireshark and TShark look in several different locations for preference files, plugins, SNMP MIBS, and RADIUS dictionaries. These locations vary from platform to platform. You can use Help › About Wireshark › Folders or `tshark -G folders` to find the default locations on your system.

## Getting Help

The User’s Guide, manual pages and various other documentation can be found at https://www.wireshark.org/docs/

Community support is available on Wireshark’s Q&A site and on the wireshark-users mailing list. Subscription information and archives for all of Wireshark’s mailing lists can be found on the mailing list site.

Bugs and feature requests can be reported on the issue tracker.

You can learn protocol analysis and meet Wireshark’s developers at SharkFest.

## How You Can Help

The Wireshark Foundation helps as many people as possible understand their networks as much as possible. You can find out more and donate at wiresharkfoundation.org.

## Frequently Asked Questions

A complete FAQ is available on the Wireshark web site.