[JENKINS-51146] Github Branch Source does not allow `#` character within branch names

Something happened within the update of Github branch source plugin 2.3.0 update when combined with the update to Jenkins core 2.73.x where when you have a branch with a # character in the name it will not be able to find the branch name.

 

Steps to recreate:

1. Create a shared library with a branch name "Branch#Test"


2. Attach that shared library to a Jenkins instance as a global library using the github modern SCM


3. Create a job which loads the branch by doing @​Library(SharedLibrary@​Branch#Test)


4. observe the job fails with 
   
   No version Branch#Test found for library GithubLibrary

This issue only happens when you update the github branch source plugin to newer than 2.3.0 and have a current version of core(from my testing) which means something in the 2.3.0 release changed this behavior.

 

Let me know if I can provide more information

---
Originally reported by ataylor, imported from: Github Branch Source does not allow `#` character within branch names

• status: Open
  
• priority: Minor
  
• component(s): github-branch-source-plugin
  
• resolution: Unresolved
  
• votes: 0
  
• watchers: 1
  
• imported: 2025-12-02
  

Raw content of original issue

Something happened within the update of Github branch source plugin 2.3.0 update when combined with the update to Jenkins core 2.73.x where when you have a branch with a # character in the name it will not be able to find the branch name.


 


Steps to recreate:



	
Create a shared library with a branch name "Branch#Test"

	
Attach that shared library to a Jenkins instance as a global library using the github modern SCM

	
Create a job which loads the branch by doing @Library(SharedLibrary@Branch#Test)

	
observe the job fails with 

No version Branch#Test found for library GithubLibrary



This issue only happens when you update the github branch source plugin to newer than 2.3.0 and have a current version of core(from my testing) which means something in the 2.3.0 release changed this behavior.


 


Let me know if I can provide more information

environment

```
Jenkins core at least 2.73.x LTS

Github Branch source 2.3.0
```