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* '9-0-stable' of dev.gitlab.org:gitlab/gitlabhq:
  Merge branch '9-0-stable-fix-cache' into '9-0-stable'
  Merge branch 'import-symlinks-9-0' into 'security-9-0'
  Merge branch 'rs-alphanumeric-ssh-params-9-0' into 'security-9-0'
  Merge branch 'fix-docs-re2-install' into 'master'
  Update VERSION to 9.0.12
  Update CHANGELOG.md for 9.0.12

Fix file disclosure via hidden symlinks using the project import (9.0)

See merge request !2161

Ensure user and hostnames begin with an alnum character in UrlBlocker

See merge request !2152

Add libre2-dev to the list of dependencies

Closes #35342

See merge request !12996

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Fix an infinite loop in Gitlab:UntrustedRegexp

See merge request !2146

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Sanitize CSV exports to prevent Excel command execution

See merge request !527

Fix mirroring and CI exploit (backport)

See merge request !522

[security-9-0] Use re2 for user-supplied regexps

See merge request !2122

[9.0 security fix] Renders 404 if given project is not readable by the user on Todos dashboard

See merge request !2135

(security-9-0) Remove the `appearance` symlink that was previously missed

See merge request !2127

Fix filename used for CHANGELOG entry

See merge request !2140

Escape the underscore char inside the LIKE operator

See merge request !2133

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Fix typo in moving the`appearance` folder in migrations

See merge request !2116

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