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The Wire · Showcase

SPRING FRAMEWORK FIXES MIME TYPE PARSER REGRESSION, AMQP CLOSES LOGBACK VULNERABILITY WINDOW

By RepoJournal · Filed · About Spring

Spring Framework patched a critical off-by-one error in MimeTypeUtils that was throwing the wrong exception on malformed input, while Spring AMQP moved aggressively to lock down conditional configuration processing in Logback.

Spring Framework addressed a regression introduced in recent changes to MimeTypeUtils.parseMimeType() [1] that exposed a StringIndexOutOfBoundsException instead of the expected InvalidMimeTypeException when parsing certain invalid MIME types, particularly quoted strings without semicolons. The fix is surgical: replacing the bounds check with a proper index validation to prevent array access violations. In parallel, Spring AMQP bumped Logback to 1.5.37 [2], which hardens conditional configuration processing and closes multiple vulnerability vectors related to unsafe Java expression evaluation in config files. Spring Session updated its CI infrastructure to actions/cache v6 [3], migrating to ESM and picking up performance improvements for workflow caching. Spring AI completed a workflow infrastructure refactor for its integration test suite [4], consolidating test execution paths. Spring Framework also merged maintenance branch updates [ref:7, ref:8] to keep version lines in sync.

Action items

References

  1. [1] Fix off-by-one error in MimeTypeUtils.parseMimeType() spring-projects/spring-framework
  2. [2] Bump ch.qos.logback:logback-classic from 1.5.35 to 1.5.37 ↗ spring-projects/spring-amqp
  3. [3] Bump actions/cache from 5 to 6 ↗ spring-projects/spring-session
  4. [4] Move Spring AI integration tests' workflow ↗ spring-projects/spring-ai
  5. [5] Merge branch '7.0.x' spring-projects/spring-framework
  6. [6] Merge branch '7.0.x' spring-projects/spring-framework

FAQ

What changed in Spring on June 27, 2026?
Spring Framework patched a critical off-by-one error in MimeTypeUtils that was throwing the wrong exception on malformed input, while Spring AMQP moved aggressively to lock down conditional configuration processing in Logback.
What should Spring teams do about it?
Upgrade Spring AMQP to latest with Logback 1.5.37 in your next dependency refresh cycle • Update Spring Framework to pick up MimeTypeUtils fix if you parse user-supplied MIME types • Verify Spring Session builds complete successfully with actions/cache v6
Which Spring repositories shipped on June 27, 2026?
spring-projects/spring-framework, spring-projects/spring-amqp, spring-projects/spring-session, spring-projects/spring-ai

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