[BUG]JWT Editor extension does not work with 2025.10.1 Burp Suite pro version. On loading seeing Java.lang.ArrayIndexOutOfBound.Exception:Index 0 out of bounds for length 0

[madhuneni13-rgb]

Expected Behavior

Current Behavior

Steps To Reproduce
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Additional Information

[DolphFlynn]

Thanks for the report. Can you post the stacktrace and reproduction steps?

[MasoudAbdaal]

My Related Issue Description
When I make a group of HTTP/2 requests in Repeater and send them in parallel (Single-Packet-Attack), I get a waiting state, and my packet doesn't send (same problem with Turbo Introder, nothing appears in Wireshark).
Send a separate/single request HTTP/2 is OK
Last-Byte-Sync (HTTP/1.1) is OK

My Environment
OS Name     Microsoft Windows 11 Pro
Version     10.0.26100 Build 26100

Solution (Portswigger Support Team)
I removed:

• %appdata%BurpSuite
• userConfig.json
• projectConfig.json

It worked for me when I completely removed the JWT Editor extension.

[DolphFlynn]

@MasoudAbdaal JWT Editor doesn't modify outbound traffic from Repeater so it's not immediately obvious what could be happening here. I'd suggest analyzing the decrypted pcap's in the two scenarios and looking for discrepancies. I think you'd be better off working with PortSwigger on this one as I'm not sure I can help much here.

[madhuneni13-rgb]

Unable to load the JWT_Editor in Burp extension.
Java version- 21
Burp Suit Pro version - 2025.10.6
SS for the stack trace is attached.

[DolphFlynn]

The intent here is to select the first algorithm of the specified (or first) signing key.

Would you mind sharing your keys data (scramble or replace anything sensitive)?

[madhuneni13-rgb]

where i can find the keys data? i have completed unistalled burp and reinstalled and seeing the same issue as above array out of bound, signing algorithm error. Tried loading the jar manully from the extensions. even that did not work.