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Support Kotlin 2.3.0 #20661
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Hi 👋
Thank for reporting this; it is already on our radar, but I cannot give you a timeline at this point, I'm afraid.
Looks like the work is being done in #20965, referencing it for transparency.
- added 2 commits that reference this issue
on Dec 25, 2025 - added 2 commits that reference this issue
on Jan 3, 2026 - added a commit that references this issue
on Jan 4, 2026 - added 2 commits that reference this issue
on Jan 5, 2026 Hello, thank you for your constant support,
I am wondering whether you have a rough estimate when this can be resolved?We have been making progress and expect to have a working solution this week. Support for Kotlin 2.3 is expected to be available in CodeQL 2.24.1 (Early February)
@andersfugmannin Kotlin: Support Kotlin 2.3.0 #20965 (comment)
Reacted by Alex Dadukin, Keven Beaulieu, Patrick Geselbracht, Urik Development, Kari Salonen, Vadzim Kapichenka, Dave Mihalcik and ina-lieder- added a commit that references this issue
on Jan 12, 2026 37 remaining items
How so? I just ran a check with 2.24.1 and it failed
@marcphilipp please file a fresh issue with the particulars, including excerpts from the logs showing what happened?
Here you go:
- added 4 commits that reference this issue
on Feb 20, 2026 - added 2 commits that reference this issue
on Mar 18, 2026 Pipelines failing again:
Kotlin version 2.3.20 is too recent. CodeQL currently supports versions below 2.3.20
Please don't repeat this with every single patch version. These are often automatically updated by Dependabot & Co. and should not break CodeQL at all. It should just work with all 2.3.X versions and not break again at 2.3.30.
Reacted by Vladimir Sitnikov, Sebastian Schuberth, Sebastian Thoms, Olaf Gottschalk, John Watson, Waffiq Aziz, Sigrid Andersson, Mathis Guillet, wxxsfxyzm, Attila Fazekas and 13 more+1 on that, and the issue should probably be reopened as the issue persists
Reacted by rupert-jung-mw, jason plumb, Mikael Gueck, Attila Fazekas, 海蓝色的咕咕鸽 and Paul
Description of the issue
Kotlin 2.3.0-Beta1 was released on 2025-10-07: https://github.com/JetBrains/kotlin/releases/tag/v2.3.0-Beta1
Kotlin 2.3.0 was released on 2025-12-16: https://github.com/JetBrains/kotlin/releases/tag/v2.3.0
CodeQL does not support Kotlin 2.3.0 yet, due to changes in the Kotlin compiler plugin api.