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title: Scala Codebase Security Audit Complete | daily.dev
description: The Scala Center, in collaboration with the Open Source Technology Improvement Fund and Quarkslab, completed the first part of a security audit of the Scala 3...
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# Scala Codebase Security Audit Complete

**[The Scala Programming Language](https://daily.dev/sources/scala-lang)** · 4 min read · 0 upvotes · 0 comments

## Summary

The Scala Center, in collaboration with the Open Source Technology Improvement Fund and Quarkslab, completed the first part of a security audit of the Scala 3 compiler and standard library, funded by the Sovereign Tech Fund. No critical or major issues were found, but 5 medium, 1 low, and 2 informational findings were identified and have all been fixed in both the 3.3 LTS and main 3.8 branches. Most issues only affect scenarios where the compiler processes untrusted input as a service, potentially leading to denial-of-service behavior. One example involved improper validation of TASTy file offsets that could cause an infinite loop. A second part of the audit, covering supply-chain security, is still to come.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://www.scala-lang.org/blog/2026/06/01/first-part-security-audit.html>

## Questions this post answers

### Were any critical security vulnerabilities found in the Scala 3 compiler and standard library audit?

No critical or major security issues were found. The audit, conducted by Quarkslab in collaboration with the Open Source Technology Improvement Fund and funded by the Sovereign Tech Fund, uncovered 5 medium severity issues, 1 low severity issue, and 2 informational findings. All have been fixed in both the Scala 3.3 LTS branch and the main Scala 3.8 branch.

_Track Scala's security posture and dependency fixes as they land by following ecosystem updates on daily.dev._

### What was the TASTy file parsing vulnerability fixed in Scala 3.8?

The Scala 3 compiler did not validate that certain offsets in TASTy files were nonnegative, which could cause an infinite loop when processing a maliciously crafted TASTy file with unexpected negative offsets. The fix added validation for parsing variable-length TASTy integers generally, addressing similar classes of issues, and was applied to both the 3.3 LTS and 3.8 branches.

_Developers hardening compiler toolchains against untrusted input can follow such fixes on daily.dev._

### Can scala.sys.Process.ProcessBuilderImpl.AbstractFunction0 be used as a deserialization gadget?

Yes, it was identified as a medium severity deserialization gadget risk in the Scala standard library during a security audit. This issue, along with problems in indexOfSlice on empty sequences and ParseException handling in Parser.tokenize for unmatched quotes, has since been fixed by Scala maintainers in both the 3.3 LTS and 3.8 branches.

_Teams auditing JVM deserialization risks can keep tabs on Scala library fixes via daily.dev._

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