Invalid HighLevelIL tokens at function braces in Pseudo C / Objective C / Rust

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#8,443 opened on Aug 19, 2026 0 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 48/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Quiet
Tech stack: c, objective-c, rust
Domain: reverse-engineering

Research direction

Reproduce the error by opening a binary, selecting a High Level IL rendered view, and clicking the outer braces of a function definition in Pseudo-C, Pseudo Objective-C, or Pseudo Rust. Start at HighLevelLanguageRepresentationFunctionGraph and inspect how the brace click resolves HighLevelIL tokens; done means those clicks no longer report an invalid token or the maximum instrIndex.

Written by the indexing model from the issue text.

Description

Version and Platform (required):

Binary Ninja Version: at least stable 5.3.9434 -> 6.0.10501-dev
Edition: Ultimate
OS: macOS 26, macOS 27, Windows

Bug Description:
When double clicking a brace for a function definition inside Pseudo-C, Pseudo Objective-C, and Pseudo Rust, An error occurs:

[Default] Invalid HighLevelIL token exprIndex 11 in HighLevelLanguageRepresentationFunctionGraph of c14 (reported instrIndex 18446744073709551615

Steps To Reproduce:
Please provide all steps required to reproduce the behavior:

Open any binary
Select any rendered view of High Level IL with braces
Click on the outer braces that the function definition lies in

Screenshots/Video Recording:

Additional Information:

What is notable is that the instrIndex is always the 64 bit integer limit.

Dominant language: C++
Stars: 1.3k
Forks: 298
Avg merge: 4d 13h
Merged PRs (30d): 20

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